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Journal articles on the topic 'Exotic Electronic States'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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1

Jiang, Wei, Zheng Liu, Jia-Wei Mei, Bin Cui, and Feng Liu. "Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework." Nanoscale 11, no. 3 (2019): 955–61. http://dx.doi.org/10.1039/c8nr08479c.

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Dichotomy between local spins and conjugated electrons spawns various exotic physical phenomena. We discover a 2D MOF dichotomy system and propose to characterize the exotic electronic states using STM.
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2

TARAPHDER, A., RAHUL PANDIT, H. R. KRISHNAMURTHY, and T. V. RAMAKRISHNAN. "THE EXOTIC BARIUM BISMUTHATES." International Journal of Modern Physics B 10, no. 08 (1996): 863–955. http://dx.doi.org/10.1142/s0217979296000362.

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We review the remarkable properties, including superconductivity, charge-density-wave ordering and metal–insulator transitions, of lead- and potassium-doped barium bismuthate. We will discuss some of the early theoretical studies of these systems. Our recent theoretical work, on the negative-U, extended-Hubbard model for these systems, will also be described. Both the large- and intermediate-U regimes of this model were examined, using mean-field and random-phase approximations, particularly with a view to fitting various experimental properties of these bismuthates. On the basis of our studie
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3

Kolezhuk, A. K., and H. J. Mikeska. "Mixed spin ladders with exotic ground states." European Physical Journal B 5, no. 3 (1998): 543–50. http://dx.doi.org/10.1007/s100510050475.

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4

KOHMOTO, MAHITO. "ELECTRONIC STATES OF QUASIPERIODIC SYSTEMS: FIBONACCI AND PENROSE LATTICES." International Journal of Modern Physics B 01, no. 01 (1987): 31–49. http://dx.doi.org/10.1142/s0217979287000049.

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Since the experiment of Shechtman et al. which suggests the crystal with the pentagonal symmetry (quasicrystal), there has been a lot of interest in the quasiperiodic systems. These can be regarded as being intermediate between ordered and disordered systems, and novel physical properties are expected. In fact, the quasicrystal in one-dimension is known to have exotic electronic properties: Cantor set energy spectrum, existence of self-similar and fractal wavefunctions and so on. These properties have intrinsically related to the renormalization-group theory and the nonlinear dynamical systems
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5

Palina, Natalia, Anil Annadi, Teguh Citra Asmara, et al. "Electronic defect states at the LaAlO3/SrTiO3 heterointerface revealed by O K-edge X-ray absorption spectroscopy." Physical Chemistry Chemical Physics 18, no. 20 (2016): 13844–51. http://dx.doi.org/10.1039/c6cp00028b.

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6

Johansson, J. Olof, Elvira Bohl, and Eleanor E. B. Campbell. "Super-atom molecular orbital excited states of fullerenes." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2076 (2016): 20150322. http://dx.doi.org/10.1098/rsta.2015.0322.

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Super-atom molecular orbitals are orbitals that form diffuse hydrogenic excited electronic states of fullerenes with their electron density centred at the centre of the hollow carbon cage and a significant electron density inside the cage. This is a consequence of the high symmetry and hollow structure of the molecules and distinguishes them from typical low-lying molecular Rydberg states. This review summarizes the current experimental and theoretical studies related to these exotic excited electronic states with emphasis on femtosecond photoelectron spectroscopy experiments on gas-phase full
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7

Heikkilä, Tero T., and Timo Hyart. "Moiré with flat bands is different." Europhysics News 50, no. 3 (2019): 24–26. http://dx.doi.org/10.1051/epn/2019304.

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Recent experimental discoveries of superconductivity and other exotic electronic states in twisted bilayer graphene (TBG) call for a reconsideration of our traditional theories of these states, usually based on the assumption of the presence of a Fermi surface. Here we show how such developments may even help us finding mechanisms of increasing the critical temperature of superconductivity towards the room temperature.
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8

Yin, Zongyou, Moshe Tordjman, Youngtack Lee, Alon Vardi, Rafi Kalish, and Jesús A. del Alamo. "Enhanced transport in transistor by tuning transition-metal oxide electronic states interfaced with diamond." Science Advances 4, no. 9 (2018): eaau0480. http://dx.doi.org/10.1126/sciadv.aau0480.

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High electron affinity transition-metal oxides (TMOs) have gained a central role in two-dimensional (2D) electronics by enabling unprecedented surface charge doping efficiency in numerous exotic 2D solid-state semiconductors. Among them, diamond-based 2D electronics are entering a new era by using TMOs as surface acceptors instead of previous molecular-like unstable acceptors. Similarly, surface-doped diamond with TMOs has recently yielded record sheet hole concentrations (2 × 1014 cm−2) and launched the quest for its implementation in microelectronic devices. Regrettably, field-effect transis
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9

Liu, Zheng, Feng Liu, and Yong-Shi Wu. "Exotic electronic states in the world of flat bands: From theory to material." Chinese Physics B 23, no. 7 (2014): 077308. http://dx.doi.org/10.1088/1674-1056/23/7/077308.

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10

Yang, Chao, Yuee Xie, Li-Min Liu, and Yuanping Chen. "Versatile electronic properties and exotic edge states of single-layer tetragonal silicon carbides." Physical Chemistry Chemical Physics 17, no. 17 (2015): 11211–16. http://dx.doi.org/10.1039/c4cp06107a.

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11

Tian, Guo, Wenda Yang, Deyang Chen, et al. "Topological domain states and magnetoelectric properties in multiferroic nanostructures." National Science Review 6, no. 4 (2019): 684–702. http://dx.doi.org/10.1093/nsr/nwz100.

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Abstract Multiferroic nanostructures have been attracting tremendous attention over the past decade, due to their rich cross-coupling effects and prospective electronic applications. In particular, the emergence of some exotic phenomena in size-confined multiferroic systems, including topological domain states such as vortices, center domains, and skyrmion bubble domains, has opened a new avenue to a number of intriguing physical properties and functionalities, and thus underpins a wide range of applications in future nanoelectronic devices. It is also highly appreciated that nano-domain engin
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12

Veerpal and Ajay. "Exotic Electronic Properties of Twisted Bilayer Graphene-Emergence of Twistronics." Journal of Physics: Conference Series 2518, no. 1 (2023): 012013. http://dx.doi.org/10.1088/1742-6596/2518/1/012013.

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Abstract In Twistronics we study the effect of relative twist between the layers of a material on the electronic properties of that layered materials. There are expected to be hundreds of layered materials which can give rise to thousands or even more layered materials with combination of layers and relative twist between the layers. There is a great possibility to encounter many exotic electronic properties in these rather less explored layered materials with relative twist between the layers. There is a lot to explore and understand, to unlock full potential of twistronics. A lot of theoreti
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13

Hasegawa, Shuji. "Surface and edge states of quantum materials." Coshare Science 3 (July 28, 2023): 1–57. https://doi.org/10.61109/cs.202502.137.

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Electronic states at surfaces, interfaces, and edges of materials emerge due to different reasons and have their own characters, which are expected to be useful for intriguing physics and possible applications to electronic/spintronics devices. Especially emerging quantum materials, such as graphene and similar monatomic-layer materials, van der Waals two-dimensional crystals, and topological insulators, show prominent features in the surface/edge states. Such states at the boundaries are different from those inside the three- or two-dimensional crystals, because of the truncation of crystal l
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14

Pyurbeeva, Eugenia, Jan A. Mol, and Pascal Gehring. "Electronic measurements of entropy in meso- and nanoscale systems." Chemical Physics Reviews 3, no. 4 (2022): 041308. http://dx.doi.org/10.1063/5.0101784.

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Entropy is one of the most fundamental quantities in physics. For systems with few degrees of freedom, the value of entropy provides a powerful insight into its microscopic dynamics, such as the number, degeneracy, and relative energies of electronic states, the value of spin, degree of localization and entanglement, and the emergence of exotic states such as non-Abelian anyons. As the size of a system decreases, the conventional methods for measuring entropy, based on heat capacity, quickly become infeasible due to the requirement of increasingly accurate measurements of heat. Several methods
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15

Biesner, Tobias, and Ece Uykur. "Pressure-Tuned Interactions in Frustrated Magnets: Pathway to Quantum Spin Liquids?" Crystals 10, no. 1 (2019): 4. http://dx.doi.org/10.3390/cryst10010004.

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Quantum spin liquids are prime examples of strongly entangled phases of matter with unconventional exotic excitations. Here, strong quantum fluctuations prohibit the freezing of the spin system. On the other hand, frustrated magnets, the proper platforms to search for the quantum spin liquid candidates, still show a magnetic ground state in most of the cases. Pressure is an effective tuning parameter of structural properties and electronic correlations. Nevertheless, the ability to influence the magnetic phases should not be forgotten. We review experimental progress in the field of pressure-t
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16

Melchakova, Iu A., G. T. Oyeniyi, S. P. Polyutov, and P. V. Avramov. "Spin Polarization and Flat Bands in Eu-Doped Nanoporous and Twisted Bilayer Graphenes." Micromachines 14, no. 10 (2023): 1889. http://dx.doi.org/10.3390/mi14101889.

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Advanced two-dimensional spin-polarized heterostructures based on twisted (TBG) and nanoporous (NPBG) bilayer graphenes doped with Eu ions were theoretically proposed and studied using Periodic Boundary Conditions Density Functional theory electronic structure calculations. The significant polarization of the electronic states at the Fermi level was discovered for both Eu/NPBG(AA) and Eu/TBG lattices. Eu ions’ chemi- and physisorption to both graphenes may lead to structural deformations, drop of symmetry of low-dimensional lattices, interlayer fusion, and mutual slides of TBG graphene fragmen
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17

Chakravarty, Sudip, and Chen-Hsuan Hsu. "Skyrmions in a density wave state: A mechanism for chiral superconductivity." Modern Physics Letters B 29, no. 16 (2015): 1540053. http://dx.doi.org/10.1142/s0217984915400539.

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Broken symmetry states characterizing density waves of higher angular momentum in correlated electronic systems are intriguing objects. In the scheme of characterization by angular momentum, conventional charge and spin density waves correspond to zero angular momentum. Here, we explore a class of exotic density wave states that have topological properties observed in recently discovered topological insulators. These rich topological density wave states deserve closer attention in not only high temperature superconductors but in other correlated electron states, as in heavy fermions, of which
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18

Wang, Siqi, Mervin Zhao, Changjian Zhang, et al. "Electron-hole hybridization in bilayer graphene." National Science Review 7, no. 2 (2019): 248–53. http://dx.doi.org/10.1093/nsr/nwz212.

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Abstract Band structure determines the motion of electrons in a solid, giving rise to exotic phenomena when properly engineered. Drawing an analogy between electrons and photons, artificially designed optical lattices indicate the possibility of a similar band modulation effect in graphene systems. Yet due to the fermionic nature of electrons, modulated electronic systems promise far richer categories of behaviors than those found in optical lattices. Here, we uncovered a strong modulation of electronic states in bilayer graphene subject to periodic potentials. We observed for the first time t
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19

Yu, P., Y. H. Chu, and R. Ramesh. "Emergent phenomena at multiferroic heterointerfaces." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1977 (2012): 4856–71. http://dx.doi.org/10.1098/rsta.2012.0199.

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The coupling and reconstruction of electronic degrees of freedom (such as charge, spin and orbital) at a heterointerface can lead to unexpected and exotic states of matter. In this study, using model systems consisting of multiferroic BiFeO 3 and ferromagnetic La 0.7 Sr 0.3 MnO 3 , we review the current understanding of a novel interfacial magnetic state formed at the interface, and highlight some possible mechanisms responsible for this interesting phenomenon and identify open questions for future studies.
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20

Banerjee, Hrishit. "Understanding the role of exchange and correlations in complex oxides under strain and oxide heterostructures." Modern Physics Letters B 34, no. 23 (2020): 2030006. http://dx.doi.org/10.1142/s0217984920300069.

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The study of complex oxides and oxide heterostructures has dominated the field of experimental and theoretical condensed matter research for the better part of the last few decades. Powerful experimental techniques such as molecular beam epitaxy and pulsed laser deposition have made fabrication of oxide heterostructures with atomically sharp interfaces possible, whereas more and more sophisticated handling of exchange and correlations within first principles methods including density functional theory (DFT) supplemented with Hubbard U corrections and hybrid functionals, and beyond DFT techniqu
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21

Li, Zhi, Jincheng Zhuang, Li Wang, et al. "Realization of flat band with possible nontrivial topology in electronic Kagome lattice." Science Advances 4, no. 11 (2018): eaau4511. http://dx.doi.org/10.1126/sciadv.aau4511.

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The energy dispersion of fermions or bosons vanishes in momentum space if destructive quantum interference occurs in a frustrated Kagome lattice with only nearest-neighbor hopping. A discrete flat band (FB) without any dispersion is consequently formed, promising the emergence of fractional quantum Hall states at high temperatures. Here, we report the experimental realization of an FB with possible nontrivial topology in an electronic Kagome lattice on twisted multilayer silicene. Because of the unique low-buckled two-dimensional structure of silicene, a robust electronic Kagome lattice has be
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22

Herbrych, J., J. Heverhagen, G. Alvarez, M. Daghofer, A. Moreo, and E. Dagotto. "Block–spiral magnetism: An exotic type of frustrated order." Proceedings of the National Academy of Sciences 117, no. 28 (2020): 16226–33. http://dx.doi.org/10.1073/pnas.2001141117.

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Competing interactions in quantum materials induce exotic states of matter such as frustrated magnets, an extensive field of research from both the theoretical and experimental perspectives. Here, we show that competing energy scales present in the low-dimensional orbital-selective Mott phase (OSMP) induce an exotic magnetic order, never reported before. Earlier neutron-scattering experiments on iron-based 123 ladder materials, where OSMP is relevant, already confirmed our previous theoretical prediction of block magnetism (magnetic order of the form↑↑↓↓). Now we argue that another phase can b
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23

Tian, Di, Zhiwei Liu, Shengchun Shen, et al. "Manipulating Berry curvature of SrRuO3 thin films via epitaxial strain." Proceedings of the National Academy of Sciences 118, no. 18 (2021): e2101946118. http://dx.doi.org/10.1073/pnas.2101946118.

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Berry curvature plays a crucial role in exotic electronic states of quantum materials, such as the intrinsic anomalous Hall effect. As Berry curvature is highly sensitive to subtle changes of electronic band structures, it can be finely tuned via external stimulus. Here, we demonstrate in SrRuO3 thin films that both the magnitude and sign of anomalous Hall resistivity can be effectively controlled with epitaxial strain. Our first-principles calculations reveal that epitaxial strain induces an additional crystal field splitting and changes the order of Ru d orbital energies, which alters the Be
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24

Urbańczyk, Tomasz, Andrzej Kędziorski, Marek Krośnicki, and Jarosław Koperski. "Rydberg-State Double-Well Potentials of Van der Waals Molecules." Molecules 29, no. 19 (2024): 4657. http://dx.doi.org/10.3390/molecules29194657.

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Recent progress in studies of Rydberg double-well electronic energy states of MeNg (Me = 12-group atom, Ng = noble gas atom) van der Waals (vdW) molecules is presented and analysed. The presentation covers approaches in experimental studies as well as ab initio-calculations of potential energy curves (PECs). The analysis is shown in a broader context of Rydberg states of hetero- and homo-diatomic molecules with PECs possessing complex ‘exotic’ structure. Laser induced fluorescence (LIF) excitation spectra and dispersed emission spectra employed in the spectroscopical characterization of Rydber
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25

Kitamura, Miho, Seigo Souma, Asuka Honma, et al. "Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick–Baez mirror optics." Review of Scientific Instruments 93, no. 3 (2022): 033906. http://dx.doi.org/10.1063/5.0074393.

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Angle-resolved photoemission spectroscopy using a micro-focused beam spot [micro-angle-resolved photoemission spectroscopy (ARPES)] is becoming a powerful tool to elucidate key electronic states of exotic quantum materials. We have developed a versatile micro-ARPES system based on the synchrotron radiation beam focused with a Kirkpatrick–Baez mirror optics. The mirrors are monolithically installed on a stage, which is driven with five-axis motion, and are vibrationally separated from the ARPES measurement system. Spatial mapping of the Au photolithography pattern on Si signifies the beam spot
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26

Ashoka, Arjun, Adam J. Clancy, Naitik A. Panjwani, et al. "Magnetically and optically active edges in phosphorene nanoribbons." Nature 639, no. 8054 (2025): 348–53. https://doi.org/10.1038/s41586-024-08563-x.

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Abstract Nanoribbons, nanometre-wide strips of a two-dimensional material, are a unique system in condensed matter. They combine the exotic electronic structures of low-dimensional materials with an enhanced number of exposed edges, where phenomena including ultralong spin coherence times1,2, quantum confinement3 and topologically protected states4,5 can emerge. An exciting prospect for this material concept is the potential for both a tunable semiconducting electronic structure and magnetism along the nanoribbon edge, a key property for spin-based electronics such as (low-energy) non-volatile
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27

Mahmood, A., W. A. Al Masary, and S. M. Ramay. "First-principles investigation of electronic, structural, and magnetic properties of Si substituted cerium phosphide compounds CeSixP1-x." Journal of Ovonic Research 20, no. 4 (2024): 467–81. http://dx.doi.org/10.15251/jor.2024.204.467.

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Cerium compounds have invited enough attention from scientists and researchers with respect to practical and fundamental implications having exotic physical, electronic, and magnetic properties like the kondo effect, anisotropic magnetic order, giant Hall effect and superconductivity. Hereby, we describe the mechanical stability and present the electronic, structural, and magnetic properties of new silicon-doped alloys of Cerium Phosphide with generic formula CeSixP1-x (x=0, 0.25, 0.5, 0.75 and 1.0) by using Wien2k code through DFT formalism. The simulation employs generalized gradient approxi
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28

"Exotic Superconducting States in Transition Metal Tellurides." JPS Hot Topics 1 (2021). http://dx.doi.org/10.7566/jpsht.1.039.

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Nb2Pd3Te5 was found to show bulk superconductivity at 3.3 K. In contrast, Ta2Pd3Te5, a 5d analogue of Nb2Pd3Te5, showed nonmetallic electronic conduction, which was changed to show bulk superconductivity by chemical doping.
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29

Liu, Zeyu, Xianghua Kong, Zewen Wu, et al. "Kagome electronic states in gradient-strained untwisted graphene bilayers." Nanoscale Horizons, 2025. https://doi.org/10.1039/d5nh00307e.

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Moiré superlattices in twisted homo-bilayers have revealed exotic electronic states, including unconventional superconductivity and correlated insulating phases. However, their fabrication process often introduces moiré disorders, hindering reproducibility and experimental control....
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30

Li, Peng, Tongrui Li, Sen Liao, et al. "Origin of the exotic electronic states in antiferromagnetic NdSb." npj Quantum Materials 8, no. 1 (2023). http://dx.doi.org/10.1038/s41535-023-00557-8.

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AbstractUsing angle resolved photoemission spectroscopy measurements and first principle calculations, we report that the possible unconventional 2q antiferromagnetic (AFM) order in NdSb can induce unusual modulation on its electronic structure. The obvious extra bands observed in the AFM phase of NdSb are well reproduced by theoretical calculations, in which the Fermi-arc-like structures and sharp extra bands are originated from the in-gap surface states. However, they are demonstrated to be topological trivial. By tuning the chemical potential, the AFM phase of NdSb would go through a topolo
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31

Gu, Shangzhi, Wenyu Liu, Shuo Mi, et al. "Twist Angle-Dependent Work Functions in CVD-Grown Twisted Bilayer Graphene Probed by Kelvin Probe Force Microscopy." Nanoscale, 2023. http://dx.doi.org/10.1039/d2nr07242d.

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Tailoring the interlayer twist angle of bilayer graphene (BLG) significantly affects its electronic properties, including its superconductivity, topological transitions, ferromagnetic states, and correlated insulating states. These exotic electronic properties are...
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32

Keçeci, Mehmet. "Weyl Semimetals: Discovery of Exotic Electronic States and Topological Phases." May 17, 2025. https://doi.org/10.5281/zenodo.15450063.

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Weyl Semimetals: Discovery of Exotic Electronic States and Topological Phases <strong>Mehmet Ke&ccedil;eci<sup>1</sup></strong> <strong><sup>1</sup></strong><strong>ORCID</strong>: https://orcid.org/0000-0001-9937-9839, İstanbul, T&uuml;rkiye &nbsp; <strong>Received</strong>: 17.05.2025 &nbsp; <strong>Abstract:</strong> &nbsp; Weyl semimetals (WSMs) have emerged as one of the most groundbreaking discoveries in condensed matter physics in recent years, deepening our fundamental scientific understanding and opening new horizons for future technologies. These materials are named after Hermann Wey
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33

Niu, X. H., D. F. Xu, Y. H. Bai, et al. "Presence of exotic electronic surface states in LaBi and LaSb." Physical Review B 94, no. 16 (2016). http://dx.doi.org/10.1103/physrevb.94.165163.

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34

Wang, Hui-Qiong, Jiayi Xu, Xiaoyuan Lin, Yaping Li, Junyong Kang, and Jin-Cheng Zheng. "Determination of the embedded electronic states at nanoscale interface via surface-sensitive photoemission spectroscopy." Light: Science & Applications 10, no. 1 (2021). http://dx.doi.org/10.1038/s41377-021-00592-9.

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AbstractThe fabrication of small-scale electronics usually involves the integration of different functional materials. The electronic states at the nanoscale interface plays an important role in the device performance and the exotic interface physics. Photoemission spectroscopy is a powerful technique to probe electronic structures of valence band. However, this is a surface-sensitive technique that is usually considered not suitable for the probing of buried interface states, due to the limitation of electron-mean-free path. This article reviews several approaches that have been used to exten
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35

Zhao, Mingwen, Yiming Lu, Xuejia Fan, Xikui Ma, Jian Liu, and Yangyang Li. "Tunable topological electronic states in the Honeycomb-kagome lattices of nitrogen/oxygen-doped graphene nanomeshes." Nanoscale Advances, 2022. http://dx.doi.org/10.1039/d2na00132b.

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The rich and exotic electronic properties of graphene nanomeshes (GNMs) have been attracting interest owning to the superiority to pristine graphene. Using first-principles calculations, we considered three graphene meshes doped...
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36

Finney, Joe, Aaron L. Sharpe, Eli J. Fox, et al. "Unusual magnetotransport in twisted bilayer graphene." Proceedings of the National Academy of Sciences 119, no. 16 (2022). http://dx.doi.org/10.1073/pnas.2118482119.

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Significance When two sheets of graphene are twisted to the magic angle of 1.1 ∘ , the resulting flat moiré bands can host exotic correlated electronic states such as superconductivity and ferromagnetism. Here, we show transport properties of a twisted bilayer graphene device at 1.38 ∘ , far enough above the magic angle that we do not expect exotic correlated states. Instead, we see several unusual behaviors in the device’s resistivity upon tuning both charge carrier density and perpendicular magnetic field. We can reproduce these behaviors with a surprisingly simple model based on Hofstadter’
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37

Kim, Sunghun, Jong Mok Ok, Hanbit Oh, et al. "Band-selective gap opening by a C 4 -symmetric order in a proximity-coupled heterostructure Sr 2 VO 3 FeAs." Proceedings of the National Academy of Sciences 118, no. 47 (2021). http://dx.doi.org/10.1073/pnas.2105190118.

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Significance Heterostructures of correlated electronic systems offer versatile platforms for various types of quantum phases and their transitions. A common wisdom states that the proximity coupling between constituent layers plays a secondary role, because it is much weaker than the intralayer interactions. In this work, we present a counterexample of the belief. Namely, the proximity coupling between localized spins and itinerant electrons stabilizes an exotic electronic state with band-selective gap opening whose observation is done in a correlated heterostructure Sr 2 VO 3 FeAs. Our findin
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38

Lim, Alane. "Capturing the 2D and 3D electronic states of novel and exotic materials." Scilight 2023, no. 33 (2023). http://dx.doi.org/10.1063/10.0020773.

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39

Xu, Chenran, Jichen Zhou, Zhexu Shan, et al. "Valley-selective manipulation of moiré excitons through optical Stark effect." Chinese Physics B, September 18, 2024. http://dx.doi.org/10.1088/1674-1056/ad7c32.

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Abstract Semiconductor moiré superlattices provide great platforms for exploring exotic collective excitations. Optical Stark effect, a shift of the electronic transition in the presence of light field, provides an ultrafast and coherent method of manipulating matter states, which, however, has not been demonstrated in moiré materials. Here, we report the valley-selective optical Stark effect of moiré excitons in the WSe2/WS2 superlattice by using transient reflection spectroscopy. Prominent valley-selective energy shifts up to 7.8 meV have been observed for moiré excitons, corresponding to ps
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40

Ju, Weiwei, Guo-Qiang Liu, and Zhongqin Yang. "Exotic spin-orbital Mott insulating states in BaIrO3." Physical Review B 87, no. 7 (2013). http://dx.doi.org/10.1103/physrevb.87.075112.

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41

Bu, Kunliang, Wenhao Zhang, Ying Fei, et al. "Observation of an electronic order along [110] direction in FeSe." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-21318-w.

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AbstractMultiple ordered states have been observed in unconventional superconductors. Here, we apply scanning tunneling microscopy to probe the intrinsic ordered states in FeSe, the structurally simplest iron-based superconductor. Besides the well-known nematic order along [100] direction, we observe a checkerboard charge order in the iron lattice, which we name a [110] electronic order in FeSe. The [110] electronic order is robust at 77 K, accompanied with the rather weak [100] nematic order. At 4.5 K, The [100] nematic order is enhanced, while the [110] electronic order forms domains with re
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Jiang, Zhicheng, Zhengtai Liu, Haiyang Ma, et al. "Flat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi3Bi5." Nature Communications 14, no. 1 (2023). http://dx.doi.org/10.1038/s41467-023-40515-3.

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AbstractA representative class of kagome materials, AV3Sb5 (A = K, Rb, Cs), hosts several unconventional phases such as superconductivity, $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial topological states, and electronic nematic states. These can often coexist with intertwined charge-density wave states. Recently, the discovery of the isostructural titanium-based single-crystals, ATi3Bi5 (A = K, Rb, Cs), which exhibit similar multiple exotic states but without the concomitant charge-density wave, has opened an opportunity to disentangle these complex states in kagome lattices. Here, we combine high-re
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43

Zou, Yuting, Hyungki Shin, Haoran Wei, et al. "Transport behaviors of topological band conduction in KTaO3’s two-dimensional electron gases." npj Quantum Materials 7, no. 1 (2022). http://dx.doi.org/10.1038/s41535-022-00536-5.

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AbstractTwo-dimensional electron gas systems (2DEGs) generated at the oxide interfaces that exhibit rich physics phenomena opened up an era for oxide-based electronics, photonics, and spintronics. The recent discovery of superconductivity plus the strong spin-orbital coupling naturally existing in the 2DEGs of KTaO3 (KTO) made KTO an exciting platform for the interplay of the electronic and spin degrees of freedom to create exotic physical properties. By directly placing KTO’s 2DEGs next to another strongly-correlated oxide with nontrivial topological nodes, we reveal the anomalous effects whi
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44

Burte, Atharva S., Omar Abdelrahman, André R. Muniz, and Ashwin Ramasubramaniam. "Thermodynamics and electronic structure of edges in monolayer MoSi2N4." Journal of Applied Physics 136, no. 3 (2024). http://dx.doi.org/10.1063/5.0218366.

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MoSi2N4 is a two-dimensional ternary nitride semiconductor that has attracted attention for its excellent mechanical and thermal properties. Theoretical studies predict that zigzag edges of this material can host magnetic edge states and Dirac fermions, but the stability of such edges has not been examined. Here, we present a density functional theory study of the electronic and thermodynamic properties of MoSi2N4 edges. We develop a (partial) ternary phase diagram that identifies a region of chemical potentials within which MoSi2N4 is stable over competing elemental or binary phases. Based on
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45

Wang, Wen-Xiao, Yi-Wen Liu, and Lin He. "Quantum anomalous Hall effect in twisted bilayer graphene." Chinese Physics B, February 7, 2025. https://doi.org/10.1088/1674-1056/adb38a.

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Abstract Recent advancements in two-dimensional van der Waals moirématerials have unveiled the captivating landscape of moiréphysics. In twisted bilayer graphene (TBG) at ‘magic angles’, strong electronic correlations give rise to a diverse array of exotic physical phenomena, including correlated insulating states, superconductivity, magnetism, topological phases, and the quantum anomalous Hall (QAH) effect. Notably, the QAH effect demonstrates substantial promise for applications in electronic and quantum computing devices with low power consumption. This article focuses on the latest develop
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Li, Yaqi, Shuwei Zhai, Yani Liu, et al. "Electronic Flat Band in Distorted Colouring Triangle Lattice." Advanced Science, October 15, 2023. http://dx.doi.org/10.1002/advs.202303483.

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AbstractDispersionless flat bands (FBs) in momentum space, given rise to electron destructive interference in frustrated lattices, offer opportunities to enhance electronic correlations and host exotic many‐body phenomena, such as Wigner crystal, fractional quantum hall state, and superconductivity. Despite successes in theory, great challenges remain in experimentally realizing FBs in frustrated lattices due to thermodynamically structural instability. Here, the observation of electronic FB in a potassium distorted colouring triangle (DCT) lattice is reported, which is supported on a blue pho
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Wang, Hongfei, and Dangyuan Lei. "Pressure-tuned superflat bands and electronic localization in twisted bilayer graphene-like materials." Journal of Applied Physics 136, no. 4 (2024). http://dx.doi.org/10.1063/5.0207883.

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Electronic properties of twisted bilayer graphene-like materials can be modified substantially by manipulating twist angles, allowing for many exotic correlated phenomena. However, typical moiré flatbands holding these phenomena only appear with specific small twist angles. Here, we report a class of pressure-tuned superflat bands and localized electronic states over a wide range of twist angles, beyond the physics of twisted bilayer graphene near the Fermi energy. Under the slowly varying lattice distortion approximation, localized electronic states deterministically emerge in isolation at th
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Zhan, Fangyang, Rui Chen, Zhen Ning, et al. "Perspective: Floquet engineering topological states from effective models towards realistic materials." Quantum Frontiers 3, no. 1 (2024). http://dx.doi.org/10.1007/s44214-024-00067-z.

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AbstractWith significant advances in classifying and cataloguing topological matter, the focus of topological physics has shifted towards quantum control, particularly the creation and manipulation of topological phases of matter. Floquet engineering, the concept of tailoring a system by periodic fields, offers a powerful tool to manipulate electronic properties of condensed systems, and even to create exotic non-equilibrium topological states that are impossibly present in equilibrium scenarios. In this perspective, we give a brief review of recent progress in theoretical investigations of Fl
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Im, Taehwan, Sun Kyu Song, Jae Whan Park, and Han Woong Yeom. "Topological soliton molecule in quasi 1D charge density wave." Nature Communications 14, no. 1 (2023). http://dx.doi.org/10.1038/s41467-023-40834-5.

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AbstractSoliton molecules, bound states of two solitons, can be important for the informatics using solitons and the quest for exotic particles in a wide range of physical systems from unconventional superconductors to nuclear matter and Higgs field, but have been observed only in temporal dimension for classical wave optical systems. Here, we identify a topological soliton molecule formed spatially in an electronic system, a quasi 1D charge density wave of indium atomic wires. This system is composed of two coupled Peierls chains, which are endowed with a Z4 topology and three distinct, right
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Chang, Yu, Xin Wang, Sanggyun Na, and Weiwei Zhang. "Computational Simulation of the Electronic State Transition in the Ternary Hexagonal Compound BaAgBi." Frontiers in Chemistry 9 (November 11, 2021). http://dx.doi.org/10.3389/fchem.2021.796323.

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Topological properties in metals or semimetals have sparked tremendous scientific interest in quantum chemistry because of their exotic surface state behavior. The current research focus is still on discovering ideal topological metal material candidates. We propose a ternary compound with a hexagonal crystal structure, BaAgBi, which was discovered to exhibit two Weyl nodal ring states around the Fermi energy level without the spin–orbit coupling (SOC) effect using theoretical calculations. When the SOC effect is considered, the topological phases transform into two Dirac nodal line states, an
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