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Journal articles on the topic 'Semimetals'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2024

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1

Hu, Jin, Su-Yang Xu, Ni Ni, and Zhiqiang Mao. "Transport of Topological Semimetals." Annual Review of Materials Research 49, no. 1 (2019): 207–52. http://dx.doi.org/10.1146/annurev-matsci-070218-010023.

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Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and many breakthroughs have been made. Several topological semimetal phases, including Dirac semimetals (DSMs), Weyl semimetals (WSMs), nodal-line semimetals (NLSMs), and triple-point semimetals, have been theoretically predicted and experimentally demonstrated. The low-energy excitation around the Dirac/Weyl nodal points, nodal line, or triply degenerated nodal point can be viewed as emergent relativistic fermi

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2

Nie, Simin, Gang Xu, Fritz B. Prinz, and Shou-cheng Zhang. "Topological semimetal in honeycomb lattice LnSI." Proceedings of the National Academy of Sciences 114, no. 40 (2017): 10596–600. http://dx.doi.org/10.1073/pnas.1713261114.

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Recognized as elementary particles in the standard model, Weyl fermions in condensed matter have received growing attention. However, most of the previously reported Weyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the underlying physics. Here, we report promising topological phases that can be realized in specific honeycomb lattices, including ideal Weyl semimetal structures, 3D strong topological insulators, and nodal-line semimetal configurations. In particular, we highlight a semimetal featuring both Weyl nodes and nodal li

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3

Ominato, Yuya, Ai Yamakage, and Kentaro Nomura. "Electric Polarization in Magnetic Topological Nodal Semimetal Thin Films." Condensed Matter 3, no. 4 (2018): 43. http://dx.doi.org/10.3390/condmat3040043.

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We theoretically study the electric polarization in magnetic topological nodal semimetal thin films. In magnetically doped topological insulators, topological nodal semimetal phases emerge once the exchange coupling overcomes the band gap. Changing the magnetization direction, nodal structure is modulated and the system becomes topological nodal point or line semimetals. We find that nodal line semimetals are characterized by non-linear electric polarization, which is not observed in nodal point semimetals. The non-linear response originates from the existence of the surface states. Screening

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4

Gao, Heng, Jörn W. F. Venderbos, Youngkuk Kim, and Andrew M. Rappe. "Topological Semimetals from First Principles." Annual Review of Materials Research 49, no. 1 (2019): 153–83. http://dx.doi.org/10.1146/annurev-matsci-070218-010049.

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We review recent theoretical progress in the understanding and prediction of novel topological semimetals. Topological semimetals define a class of gapless electronic phases exhibiting topologically stable crossings of energy bands. Different types of topological semimetals can be distinguished on the basis of the degeneracy of the band crossings, their codimension (e.g., point or line nodes), and the crystal space group symmetries on which the protection of stable band crossings relies. The dispersion near the band crossing is a further discriminating characteristic. These properties give ris

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5

Chang, Guoqing, Su-Yang Xu, Daniel S. Sanchez, et al. "A strongly robust type II Weyl fermion semimetal state in Ta3S2." Science Advances 2, no. 6 (2016): e1600295. http://dx.doi.org/10.1126/sciadv.1600295.

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Weyl semimetals are of great interest because they provide the first realization of the Weyl fermion, exhibit exotic quantum anomalies, and host Fermi arc surface states. The separation between Weyl nodes of opposite chirality gives a measure of the robustness of the Weyl semimetal state. To exploit the novel phenomena that arise from Weyl fermions in applications, it is crucially important to find robust separated Weyl nodes. We propose a methodology to design robust Weyl semimetals with well-separated Weyl nodes. Using this methodology as a guideline, we search among the material parameter s

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6

Zou, Yuxiao, Ying Liu, and Guofeng Song. "Mid-Infrared Sensor Based on Dirac Semimetal Coupling Structure." Sensors 22, no. 6 (2022): 2116. http://dx.doi.org/10.3390/s22062116.

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A multilayer structure based on Dirac semimetals is investigated, where long-range surface plasmon resonance (LRSPR) of a dielectric layer/Dirac semimetal/dielectric layer are coupled with surface plasmon polaritons (SPPs) on graphene to substantially improve the Goos–Hänchen (GH) shift of Dirac semimetals in the mid-infrared band. This has important implications for the study of mid-infrared sensors. We studied the reflection coefficient and phase of this multilayer structure using a generalized transport matrix. We established that subtle changes in the refractive index of the sensing medium

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7

Galeeva, Alexandra V., Ivan V. Krylov, Konstantin A. Drozdov, et al. "Electron energy relaxation under terahertz excitation in (Cd1− x Zn x )3As2 Dirac semimetals." Beilstein Journal of Nanotechnology 8 (January 17, 2017): 167–71. http://dx.doi.org/10.3762/bjnano.8.17.

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We demonstrate that measurements of the photo-electromagnetic effect using terahertz laser radiation provide an argument for the existence of highly conductive surface electron states with a spin texture in Dirac semimetals (Cd1− x Zn x )3As2. We performed a study on a range of (Cd1− x Zn x )3As2 mixed crystals undergoing a transition from the Dirac semimetal phase with an inverse electron energy spectrum to trivial a semiconductor with a direct spectrum in the crystal bulk by varying the composition x. We show that for the Dirac semimetal phase, the photo-electromagnetic effect amplitude is d

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8

Ang, L. K., Yee Sin Ang, and Ching Hua Lee. "Universal model for electron thermal-field emission from two-dimensional semimetals." Physics of Plasmas 30, no. 3 (2023): 033103. http://dx.doi.org/10.1063/5.0137400.

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We present the theory of out-of-plane (or vertical) electron thermal-field emission from two-dimensional (2D) semimetals. We show that the current–voltage–temperature characteristic is well captured by a universal scaling relation applicable for broad classes of 2D semimetals, including graphene and its few-layer, nodal point semimetal, Dirac semimetal at the verge of topological phase transition, and nodal line semimetal. Here, an important consequence of the universal emission behavior is revealed: In contrast to the common expectation that band topology shall manifest differently in the phy

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9

Liu, D. F., A. J. Liang, E. K. Liu, et al. "Magnetic Weyl semimetal phase in a Kagomé crystal." Science 365, no. 6459 (2019): 1282–85. http://dx.doi.org/10.1126/science.aav2873.

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Weyl semimetals are crystalline solids that host emergent relativistic Weyl fermions and have characteristic surface Fermi-arcs in their electronic structure. Weyl semimetals with broken time reversal symmetry are difficult to identify unambiguously. In this work, using angle-resolved photoemission spectroscopy, we visualized the electronic structure of the ferromagnetic crystal Co3Sn2S2 and discovered its characteristic surface Fermi-arcs and linear bulk band dispersions across the Weyl points. These results establish Co3Sn2S2 as a magnetic Weyl semimetal that may serve as a platform for real

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10

Rong, Jia-Nan, Liang Chen, and Kai Chang. "Chiral Anomaly-Enhanced Casimir Interaction between Weyl Semimetals." Chinese Physics Letters 38, no. 8 (2021): 084501. http://dx.doi.org/10.1088/0256-307x/38/8/084501.

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We theoretically study the Casimir interaction between Weyl semimetals. When the distance a between semi-infinite Weyl semimetals is in the micrometer regime, the Casimir attraction can be enhanced by the chiral anomaly. The Casimir attraction depends sensitively on the relative orientations between the separations ( b 1, b 2) of Weyl nodes in the Brillouin zone and show anisotropic behavior for the relative orientation of these separations ( b 1, b 2) when they orient parallel to the interface. This anisotropy is quite larger than that in conventional birefringent materials. The Casimir force

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11

Xu, Su-Yang, Ilya Belopolski, Daniel S. Sanchez, et al. "Experimental discovery of a topological Weyl semimetal state in TaP." Science Advances 1, no. 10 (2015): e1501092. http://dx.doi.org/10.1126/sciadv.1501092.

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Weyl semimetals are expected to open up new horizons in physics and materials science because they provide the first realization of Weyl fermions and exhibit protected Fermi arc surface states. However, they had been found to be extremely rare in nature. Recently, a family of compounds, consisting of tantalum arsenide, tantalum phosphide (TaP), niobium arsenide, and niobium phosphide, was predicted as a Weyl semimetal candidates. We experimentally realize a Weyl semimetal state in TaP. Using photoemission spectroscopy, we directly observe the Weyl fermion cones and nodes in the bulk, and the F

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12

Chen, Guifeng, Bolin Long, Lei Jin, et al. "Synthesis of Weyl Semi-Metal Co3Sn2S2 by Hydrothermal Method and Its Physical Properties." Metals 12, no. 5 (2022): 830. http://dx.doi.org/10.3390/met12050830.

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In the field of condensed matter physics, as new quantum materials, topological semimetals have a special topological energy band structure and nontrivial band crossings in the energy band, which will have many excellent topological properties, such as internal insulation of topological insulators and the presence of conduction electrons on the surface; this makes topological semimetals exhibit wider application prospects in electronic devices. So far, the experimental synthesis of topological semimetals was performed using physical methods to synthesize bulk single crystals, which is not cond

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13

Fu, Chenguang, Satya N. Guin, Thomas Scaffidi, et al. "Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn4." Research 2020 (April 7, 2020): 1–8. http://dx.doi.org/10.34133/2020/4643507.

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Highly conductive topological semimetals with exotic electronic structures offer fertile ground for the investigation of the electrical and thermal transport behavior of quasiparticles. Here, we find that the layer-structured Dirac semimetal PtSn4 exhibits a largely suppressed thermal conductivity under a magnetic field. At low temperatures, a dramatic decrease in the thermal conductivity of PtSn4 by more than two orders of magnitude is obtained at 9 T. Moreover, PtSn4 shows both strong longitudinal and transverse thermoelectric responses under a magnetic field. Large power factor and Nernst p

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14

Wang, Xiao, Xiaoxing Wei, and Caixia Song. "Growth of Semimetals Bismuth and Antimony Films on Reactive Substrate." Journal of Nanomaterials 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/581486.

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Semimetal Bi and Sb thin films with novel hierarchical structures were synthesized on zinc substrate via a hydrothermal method. X-ray diffraction (XRD) analysis confirmed the formation of pure semimetals Bi and Sb. Scanning electron microscopy images showed that Bi films constructed with microtube arrays and hierarchical microspheres can be obtained selectively by altering the concentration of Bi3+ions. The synthesized Sb films were constructed with bowl-shaped particles. The growth process of these semimetal architectures was briefly discussed.

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15

Chu, Chun-Guang, An-Qi Wang, and Zhi-Min Liao. "Josephson effect in topological semimetal-superconductor heterojunctions." Acta Physica Sinica 72, no. 8 (2023): 087401. http://dx.doi.org/10.7498/aps.72.20230397.

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Topological semimetals are exotic phases of quantum matter with gapless electronic excitation protected by symmetry. Benefitting from its unique relativistic band dispersion, topological semimetals host abundant quantum states and quantum effects, esuch as Fermi-arc surface states and chiral anomaly. In recent years, due to the potential application in topological quantum computing, the hybrid system of topology and superconductivity has aroused wide interest in the community. Recent experimental progress of topological semimetal-superconductor heterojunctions is reviewed in two aspects: 1) Jo

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16

Rice, Anthony, and Kirstin Alberi. "Epitaxial Integration of Dirac Semimetals with Si(001)." Crystals 13, no. 4 (2023): 578. http://dx.doi.org/10.3390/cryst13040578.

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Topological semimetals contain novel combinations of properties that make them useful in a variety of applications, including optoelectronics, spintronics and low energy computing, and catalysis. Although they have been grown with high quality as bulk single crystals, incorporation with semiconductor substrates will ultimately be required to maximize their technological reach. Here, epitaxial growth of the Dirac semimetal Cd3As2 on Si(001) is demonstrated through two routes. First, Cd3As2(112) epilayers are grown on Si(001) via an intermediate CdTe(111) buffer layer. Second, Cd3As2(112) is gro

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17

Huang, Shin-Ming, Su-Yang Xu, Ilya Belopolski, et al. "New type of Weyl semimetal with quadratic double Weyl fermions." Proceedings of the National Academy of Sciences 113, no. 5 (2016): 1180–85. http://dx.doi.org/10.1073/pnas.1514581113.

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Weyl semimetals have attracted worldwide attention due to their wide range of exotic properties predicted in theories. The experimental realization had remained elusive for a long time despite much effort. Very recently, the first Weyl semimetal has been discovered in an inversion-breaking, stoichiometric solid TaAs. So far, the TaAs class remains the only Weyl semimetal available in real materials. To facilitate the transition of Weyl semimetals from the realm of purely theoretical interest to the realm of experimental studies and device applications, it is of crucial importance to identify o

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18

Chen, M. N., W. C. Chen, and Yu Zhou. "Topological hybrid semimetal phases and anomalous Hall effects in a three dimensional magnetic topological insulator." Journal of Physics: Condensed Matter 34, no. 2 (2021): 025502. http://dx.doi.org/10.1088/1361-648x/ac2ed7.

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Abstract In this work, we propose a ferromagnetic Bi2Se3 as a candidate to hold the coexistence of Weyl- and nodal-line semimetal phases, which breaks the time reversal symmetry. We demonstrate that the type-I Weyl semimetal phase, type-I-, type-II- and their hybrid nodal-line semimetal phases can arise by tuning the Zeeman exchange field strength and the Fermi velocity. Their topological responses under U(1) gauge field are also discussed. Our results raise a new way for realizing Weyl and nodal-line semimetals and will be helpful in understanding the topological transport phenomena in three-

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19

Nakashima, S., M. Hase, K. Mizoguchi, et al. "Coherent phonons in mixed semimetals and semimetal superlattices." Physica B: Condensed Matter 263-264 (March 1999): 67–69. http://dx.doi.org/10.1016/s0921-4526(98)01301-5.

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20

Yadav, Suman, Atul Gour, Madhu Sarwan, and Sadhna Singh. "Mechanical and Optical Properties of Topological Semimetal Compound YPtBi." Journal of Physics: Conference Series 2603, no. 1 (2023): 012016. http://dx.doi.org/10.1088/1742-6596/2603/1/012016.

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Abstract We have reported the mechanical properties of topological semimetals half-Heusler compound YPtBi with LDA and GGA approximation which is implemented in density functional theory. We have calculated elastic parameters which ensure good machinability, covalent bonding, brittleness, low value of Kleinman parameter and high Vickers hardness. Our results reveal the hardness or large resistance of these topological semimetals. Moreover, Born mechanical stability conditions are well fulfilled by the topological semimetal YPtBi. Present study reveals that the low value of bulk modulus and she

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21

Wang, Jing, Biao Lian та Shou-Cheng Zhang. "Generation of Spin Currents by Magnetic Field in 𝒯- and 𝒫-Broken Materials". SPIN 09, № 04 (2019): 1940013. http://dx.doi.org/10.1142/s2010324719400137.

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Pure spin currents carry information in quantum spintronics and could play an essential role in the next generation low-energy-consumption electronics. Here, we theoretically predict that the magnetic field can induce a quantum spin current without a concomitant charge current in metals without time reversal symmetry [Formula: see text] and inversion symmetry [Formula: see text] but respect the combined [Formula: see text] symmetry. It is governed by the magnetic moment of the Bloch states on the Fermi surface, and can be regarded as a spinful generalization of the gyrotropic magnetic effect i

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22

Le, Congcong, Xianxin Wu, Shengshan Qin та ін. "Dirac semimetal in β-CuI without surface Fermi arcs". Proceedings of the National Academy of Sciences 115, № 33 (2018): 8311–15. http://dx.doi.org/10.1073/pnas.1803599115.

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Anomalous surface states with Fermi arcs are commonly considered to be a fingerprint of Dirac semimetals (DSMs). In contrast to Weyl semimetals, however, Fermi arcs of DSMs are not topologically protected. Using first-principles calculations, we predict that β-cuprous iodide (β-CuI) is a peculiar DSM whose surface states form closed Fermi pockets instead of Fermi arcs. In such a fermiological Dirac semimetal, the deformation mechanism from Fermi arcs to Fermi pockets stems from a large cubic term preserving all crystal symmetries and from the small energy difference between the surface and bul

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23

Morali, Noam, Rajib Batabyal, Pranab Kumar Nag, et al. "Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2." Science 365, no. 6459 (2019): 1286–91. http://dx.doi.org/10.1126/science.aav2334.

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Bulk–surface correspondence in Weyl semimetals ensures the formation of topological “Fermi arc” surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal Co3Sn2S2, we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra–Brillouin zone Weyl node connectivity of Fermi arcs, whereas on

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24

Fereidouni, A., M. H. Doha, K. Pandey, R. Basnet, J. Hu, and H. O. H. Churchill. "Enhancement of 2D topological semimetal transport properties by current annealing." Applied Physics Letters 121, no. 11 (2022): 113101. http://dx.doi.org/10.1063/5.0102933.

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Observation of intrinsic quantum transport properties of two-dimensional (2D) topological semimetals can be challenging due to suppression of high mobility caused by extrinsic factors introduced during fabrication. We demonstrate current annealing as a method to substantially improve electronic transport properties of 2D topological semimetal flakes. Contact resistance and resistivity were improved by factors up to [Formula: see text] and [Formula: see text], respectively, in devices based on exfoliated flakes of two topological semimetals, ZrSiSe and BaMnSb2. Using this method, carrier mobili

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25

Liu, Yiyuan, Yu-Fei Liu, Xin Gui, et al. "Bond-breaking induced Lifshitz transition in robust Dirac semimetal VAI3." Proceedings of the National Academy of Sciences 117, no. 27 (2020): 15517–23. http://dx.doi.org/10.1073/pnas.1917697117.

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Topological electrons in semimetals are usually vulnerable to chemical doping and environment change, which restricts their potential application in future electronic devices. In this paper, we report that the type-II Dirac semimetalVAl3hosts exceptional, robust topological electrons which can tolerate extreme change of chemical composition. The Dirac electrons remain intact, even after a substantial part of V atoms have been replaced in theV1−xTixAl3solid solutions. This Dirac semimetal state ends atx=0.35, where a Lifshitz transition to p-type trivial metal occurs. The V–Al bond is completel

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Wang, Zong-Yao, Xiang-Can Cheng, Bao-Zong Wang, et al. "Realization of an ideal Weyl semimetal band in a quantum gas with 3D spin-orbit coupling." Science 372, no. 6539 (2021): 271–76. http://dx.doi.org/10.1126/science.abc0105.

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Weyl semimetals are three-dimensional (3D) gapless topological phases with Weyl cones in the bulk band. According to lattice theory, Weyl cones must come in pairs, with the minimum number of cones being two. A semimetal with only two Weyl cones is an ideal Weyl semimetal (IWSM). Here we report the experimental realization of an IWSM band by engineering 3D spin-orbit coupling for ultracold atoms. The topological Weyl points are clearly measured via the virtual slicing imaging technique in equilibrium and are further resolved in the quench dynamics. The realization of an IWSM band opens an avenu

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27

Cheskis, Dima. "Magneto-Optical Tools to Study Effects in Dirac and Weyl Semimetals." Symmetry 12, no. 9 (2020): 1412. http://dx.doi.org/10.3390/sym12091412.

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Research regarding topological Dirac and Weyl semimetals contributes to our understanding not only of the field of solid-state physics, but also the field of high-energy physics as the physics of Dirac and Weyl semimetals resembles the physics of Dirac and Weyl massless fermions. In condensed matter physics, the Weyl nodes are detached in momentum space and may be realized as emergent quasiparticles with a distinct chirality, left-handed or right-handed. These states lead to phenomena like the chiral anomaly and the anomalous Hall effect (AHE). Furthermore, the combination of quantum effects a

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28

Lee, Sang-Eon, Myeong-jun Oh, Sanghyun Ji та ін. "Orbit topology analyzed from π phase shift of magnetic quantum oscillations in three-dimensional Dirac semimetal". Proceedings of the National Academy of Sciences 118, № 29 (2021): e2023027118. http://dx.doi.org/10.1073/pnas.2023027118.

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With the emergence of Dirac fermion physics in the field of condensed matter, magnetic quantum oscillations (MQOs) have been used to discern the topology of orbits in Dirac materials. However, many previous researchers have relied on the single-orbit Lifshitz–Kosevich (LK) formula, which overlooks the significant effect of degenerate orbits on MQOs. Since the single-orbit LK formula is valid for massless Dirac semimetals with small cyclotron masses, it is imperative to generalize the method applicable to a wide range of Dirac semimetals, whether massless or massive. This report demonstrates ho

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Chen, Cheng, Huaiqiang Wang, Dinghui Wang, and Haijun Zhang. "Strain-Engineered Nonlinear Hall Effect in HgTe." SPIN 09, no. 04 (2019): 1940017. http://dx.doi.org/10.1142/s2010324719400174.

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As paradigmatic phenomena, Hall effects have inspired tremendous studies of symmetry and topology in condensed matter physics. Intriguingly, a second-order nonlinear Hall effect was recently proposed in noncentrosymmetric materials even in the presence of time-reversal symmetry. This effect originates from the Berry curvature dipole of electronic band structures and was predicted in Dirac and Weyl materials such as transition metal dichalcogenides and Weyl semimetals. Although it has been experimentally verified in some transition metal dichalcogenides, no obvious observation of such effects h

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Shekhar, Chandra, Nitesh Kumar, V. Grinenko, et al. "Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)." Proceedings of the National Academy of Sciences 115, no. 37 (2018): 9140–44. http://dx.doi.org/10.1073/pnas.1810842115.

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Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over

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31

Burkov, A. A. "Topological semimetals." Nature Materials 15, no. 11 (2016): 1145–48. http://dx.doi.org/10.1038/nmat4788.

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Ghosh, Suvendu, Snehasish Nandy, and A. Taraphder. "Revisiting quantum transport across junctions of single and double-Weyl semimetals." Journal of Physics: Conference Series 2518, no. 1 (2023): 012005. http://dx.doi.org/10.1088/1742-6596/2518/1/012005.

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Abstract Different types of transport in topological semimetals probe the signatures of their band topology directly. Using Landuer-Buttiker formalism, we study transport through a rectangular potential barrier created across a junction between two topological multi-Weyl semimetals (MSMs). In contrast to a regular Weyl semimetal with topological charge J = 1, MSMs are allowed to have monopole charges J > 1. Consequently, the band structures show highly anisotropic dispersions, being linear exclusively in one momentum direction, and exhibiting a power law dependence, governed by the topologi

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Boyda, D. L., V. V. Braguta, M. I. Katsnelson, and A. Yu Kotov. "Phase diagram and Chiral Magnetic Effect in Dirac Semimetals from Lattice Simulation." EPJ Web of Conferences 175 (2018): 03001. http://dx.doi.org/10.1051/epjconf/201817503001.

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Dirac Semimetals Na3Bi and Cd3As2 are recently discovered materials, which low energy electronic spectrum is described by two flavours of massless 3+1D fermions. In order to study electronic properties of these materials we formulated lattice field theory with rooted staggered fermions on anisotropic lattice. It is shown that in the limit of zero temporal lattice spacing this theory reproduces effective theory of Dirac semimetals. Using the lattice field theory we study the phase diagram of Dirac semimetals in the plane effective coupling constant - Fermi velocity anisotropy. We also measure c

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Teng, Yu Jia. "Heusler Compounds and their Topological Semimetal States." Materials Science Forum 1027 (April 2021): 33–41. http://dx.doi.org/10.4028/www.scientific.net/msf.1027.33.

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Heusler compounds are a family of materials with high tunability due to their structure and lots of states or properties have been discovered in it. Topological semimetals (TSM) are a new phase of quantum matter that many materials have been reported to have this phase, including Heusler compounds. In this review, basic concepts of Heusler compounds and main properties of three TSMs are first reviewed, followed by analysis of topological semimetal states in Heusler compounds. In the end, the most suitable TSM state in Heusler compound is given.

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Huang, Silu, Jisun Kim, W. A. Shelton, E. W. Plummer, and Rongying Jin. "Nontrivial Berry phase in magnetic BaMnSb2 semimetal." Proceedings of the National Academy of Sciences 114, no. 24 (2017): 6256–61. http://dx.doi.org/10.1073/pnas.1706657114.

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The subject of topological materials has attracted immense attention in condensed-matter physics because they host new quantum states of matter containing Dirac, Majorana, or Weyl fermions. Although Majorana fermions can only exist on the surface of topological superconductors, Dirac and Weyl fermions can be realized in both 2D and 3D materials. The latter are semimetals with Dirac/Weyl cones either not tilted (type I) or tilted (type II). Although both Dirac and Weyl fermions have massless nature with the nontrivial Berry phase, the formation of Weyl fermions in 3D semimetals require either t

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Liao, Xin, Chang Xu, Zi-Pu Fan, et al. "Gate-enhanced broadband photodetection based on Cd₃As₂/graphene Dirac heterojunctions." Applied Physics Letters 122, no. 3 (2023): 031105. http://dx.doi.org/10.1063/5.0139561.

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Dirac semimetals are promising materials for broadband and fast photodetection due to their gapless nature. Dirac heterostructures consisting of 2D Dirac semimetal graphene and its 3D analogue Cd3As2 should take the ascendency of high carrier mobility in both materials, while overcome the limitation of weak optical absorption in graphene-based devices and suppress the dark current occurring in pure Cd3As2 photodetectors. Herein, we report high-performance photodetectors based on a 3D Dirac semimetal Cd3As2/monolayer graphene heterostructure, which show broadband photoresponse from visible (488

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Boyko, Yu I., V. V. Bogdanov, Z. F. Nazyrov, R. V. Vovk, and B. V. Grinyov. "“Metallization” of semimetals by an external electric field." Low Temperature Physics 49, no. 11 (2023): 1268–70. http://dx.doi.org/10.1063/10.0021372.

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The paper considers the possibility of changing the energy spectrum of the electronic subsystem of semimetals from a non-degenerate to a degenerate state under the action of an external electric field. This “metallization” of semimetals is achieved by increasing the concentration of free electrons in the external field. The work also considers the possible transition of “metallized” semimetals to the superconducting state. The evaluations made show that for the size of the sample R ≤ 100 nm and for the magnitude of the field source voltage U ≈ 10 V, “metallized” semimetals and their solid solu

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Xu, Xin-Xin, Zi-Ming Wang, Dong-Hui Xu, and Chui-Zhen Chen. "Photoinduced Floquet higher-order Weyl semimetal in C ₆ symmetric Dirac semimetals." Chinese Physics B, May 2, 2024. http://dx.doi.org/10.1088/1674-1056/ad4634.

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Abstract Topological Dirac semimetals are a parent state from which other exotic topological phases of matter, such as Weyl semimetals and topological insulators, can emerge. In this study, we investigate a Dirac semimetal possessing sixfold rotational symmetry and hosting higher-order topological hinge Fermi arc states, which is irradiated by circularly polarized light. Our findings reveal that circularly polarized light splits each Dirac node into a pair of Weyl nodes due to the breaking of time-reversal symmetry, resulting in the realization of the Weyl semimetal phase. This Weyl semimetal

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Gao, Ling-Long, Yan Liu, and Hong-Da Lyu. "Black hole interiors in holographic topological semimetals." Journal of High Energy Physics 2023, no. 3 (2023). http://dx.doi.org/10.1007/jhep03(2023)034.

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Abstract We study the black hole interiors in holographic Weyl semimetals and holographic nodal line semimetals. We find that the black hole singularities are of Kasner form. In the topologically nontrivial phase at low temperature, both the Kasner exponents of the metric fields and the proper time from the horizon to the singularity are almost constant, likely reflecting the topological nature of the topological semimetals. We also find some specific behaviors inside the horizon in each holographic semimetal model.

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He, Wen-Yu, Xiao Yan Xu, and K. T. Law. "Kramers Weyl semimetals as quantum solenoids and their applications in spin-orbit torque devices." Communications Physics 4, no. 1 (2021). http://dx.doi.org/10.1038/s42005-021-00564-w.

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AbstractKramers Weyl semimetals are Weyl semimetals that have Weyl points pinned at the time reversal invariant momenta. Recently it has been discovered that all chiral crystals host Weyl points at time reversal invariant momenta, so metals with chiral lattice symmetry all belong to the category of Kramers Weyl semimetals. In this work, we show that due to the chiral lattice symmetry, Kramers Weyl semimetals have the unique longitudinal magnetoelectric effect in which the charge current induced spin and orbital magnetization is parallel to the direction of the current. This feature allows Kram

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jia, kaixiang, Xinyu Liu, Rong Ma, Hao Geng, L. Sheng, and Dingyu Xing. "Phase Diagram of Three DimensionalDisordered Nodal-Line Semimetals: Weak Localization To Anderson Localization." New Journal of Physics, November 2, 2023. http://dx.doi.org/10.1088/1367-2630/ad08f4.

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Abstract Nodal-line semimetals are new members of the topological materials family whose experimental&#xD;characterization has seen recent progress using both ARPES and quantum oscillation measurements.&#xD;Here, we theoretically study the presence of a disorder-induced phase transition in a cubic lattice&#xD;nodal-line semimetal using numerical diagonalization and spectral calculations. In contrast to the&#xD;3D nodal-point semimetals, we found that nodal-line semimetals do not display a stable disordered&#xD;semimetal phase, as an infinitely weak disorder can lead to a di

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Lanzillo, Nicholas A., Utkarsh Bajpai, and Ching-Tzu Chen. "Topological semimetal interface resistivity scaling for vertical interconnect applications." Applied Physics Letters 124, no. 18 (2024). http://dx.doi.org/10.1063/5.0200403.

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In this work, we explore the electron scattering characteristics at interfaces between normal metals and topological semimetals in bulk as well as in thin film structures. We consider Cu/Ta and CoSi/Ta as representative metal/metal and topological semimetal/metal interface structures, respectively. For bulk interface structures, we find that metal/topological semimetal interfaces have roughly 20× higher interfacial resistivity than normal metal/metal interfaces primarily due to the low electronic density of states, the Fermi level in bulk topological semimetals. For thin films, we find that no

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Lotfi, Jafar, and Babak Abdollahipour. "Thermoelectric effects in ballistic junctions of 2D-Weyl semimetals." Physica Scripta, May 15, 2024. http://dx.doi.org/10.1088/1402-4896/ad4c17.

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Abstract Two-dimensional Weyl semimetals are a variant of topological materials in two dimensions, which are realized in three atomic layer materials. These materials possess isotropic or anisotropic dispersions around Weyl nodes and present some common physical properties with their 3D counterparts. We study the thermoelectric effects in a ballistic junction of 2D-Weyl semimetal with isotropic or anisotropic dispersions around the Weyl points. We demonstrate that these two types of 2D-Weyl semimetals exhibit different thermoelectric responses at low chemical potentials of the leads. The Weyl

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Zhang, Cheng-Long, Tian Liang, M. S. Bahramy, et al. "Berry curvature generation detected by Nernst responses in ferroelectric Weyl semimetal." Proceedings of the National Academy of Sciences 118, no. 44 (2021). http://dx.doi.org/10.1073/pnas.2111855118.

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Significance An ideal Weyl semimetal with high tunability is an undoubtedly important platform for realizing and manipulating exotic quantum properties of topological semimetals. Currently, all the existing nonmagnetic Weyl semimetals are not ideal and out of external control, namely, no couplings to an order parameter. In this work, we report with a topological phase transition diagram the successful realization of a Weyl semimetal phase by chemically engineering the PbTe-SnTe alloy. Furthermore, we demonstrate that the Weyl semimetal phase is strongly coupled with the underlying ferroelectri

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Cichorek, T., Ł. Bochenek, J. Juraszek, Yu V. Sharlai, and G. P. Mikitik. "Detection of relativistic fermions in Weyl semimetal TaAs by magnetostriction measurements." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-31321-4.

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AbstractThus far, a detection of the Dirac or Weyl fermions in topological semimetals remains often elusive, since in these materials conventional charge carriers exist as well. Here, measuring a field-induced length change of the prototype Weyl semimetal TaAs at low temperatures, we find that its c-axis magnetostriction amounts to relatively large values whereas the a-axis magnetostriction exhibits strong variations with changing the orientation of the applied magnetic field. It is discovered that at magnetic fields above the ultra-quantum limit, the magnetostriction of TaAs contains a linear

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Feng, Xuewei, Zhi Gen Yu, Haoyue Guo, Yida Li, Yong‐Wei Zhang, and Kah‐Wee Ang. "Direct Observation of Semimetal Contact Induced Charge Doping and Strain Effect in CVD‐Grown Monolayer MoS₂ Transistors." Advanced Electronic Materials, March 5, 2024. http://dx.doi.org/10.1002/aelm.202300820.

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AbstractTwo‐dimensional Materials (2DMs) offer significant promise for advancing device miniaturization and extending Moore's law. Despite the challenges posed by high contact resistance in transistors, recent discoveries highlight semimetals as an effective approach for achieving ohmic contact with near‐quantum‐limit contact resistance. The energy band hybridization between semimetal and MoS2 is found to create degenerate states and heavily doped contact, which is proposed as the underlying mechanism responsible for reducing contact resistance. However, a quantitative and comprehensive charac

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Biswal, Bubunu, Ramesh Rajarapu, Saroj Poudyal, et al. "Layered semimetal electrodes for future heterogeneous electronics." Applied Physics Letters 123, no. 11 (2023). http://dx.doi.org/10.1063/5.0164063.

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Integration of the emerging layered materials with the existing CMOS platform is a promising solution to enhance the performance and functionalities of the future CMOS based integrated circuits. In this direction, we have experimentally studied the suitability of the layered semimetals, namely, Td-WTe2, 1T′-MoTe2, 1T-PtTe2, and 1T-PtSe2, as an electrode with two most commonly used semiconductors, i.e., silicon (Si) and germanium (Ge) used in the CMOS technology. Two kinds of devices, i.e., metal–oxide–semiconductor (MOS) capacitors and metal-semiconductor (MS) diodes, are investigated with the

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Shoriki, Kentaro, Keigo Moriishi, Yoshihiro Okamura, et al. "Large nonlinear optical magnetoelectric response in a noncentrosymmetric magnetic Weyl semimetal." Proceedings of the National Academy of Sciences 121, no. 12 (2024). http://dx.doi.org/10.1073/pnas.2316910121.

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Weyl semimetals resulting from either inversion ( P ) or time-reversal ( T ) symmetry breaking have been revealed to show the record-breaking large optical response due to intense Berry curvature of Weyl-node pairs. Different classes of Weyl semimetals with both P and T symmetry breaking potentially exhibit optical magnetoelectric (ME) responses, which are essentially distinct from the previously observed optical responses in conventional Weyl semimetals, leading to the versatile functions such as directional dependence for light propagation and gyrotropic effects. However, such optical ME phe

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Wu, Fang Jia, Shasha Ke, Yong Guo, Huaiwu Zhang, and HF Lu. "Non-centrosymmetric Weyl Semimetal State and Strain Effect in the Twisted-brick Phase Transition Metal Monochalcogenides." Nanoscale, 2023. http://dx.doi.org/10.1039/d2nr04946e.

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Weyl semimetals are a class of gapless electronic excitation topological quantum materials upon breaking time-reversal or inversion symmetry. Here, we demonstrate the existence of the Weyl semimetal state in the...

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Abdol, Somayeh Oskoui, and Babak Abdollahipour. "Asymmetrical plasmonic absorber and reflector based on tilted Weyl semimetals." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-94808-y.

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AbstractWe investigate the surface plasmon polariton dispersion and optical spectra of a thin film of tilted Weyl semimetal. Tilted Weyl semimetals possess tilted Weyl cones at the Weyl nodes and are categorized to type-I with closed Fermi surfaces and type-II with overtilted Weyl cones and open Fermi surfaces. We find that the surface plasmon polariton dispersion of this system is nonreciprocal even in the absence of the external magnetic field. Moreover, we demonstrate that the tilt parameter has a profound effect in controlling this nonreciprocity. We reveal that the thin film of type-II We

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