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1

Zhang, Chaofan, Yiwei Li, Ding Pei, Zhongkai Liu, and Yulin Chen. "Angle-Resolved Photoemission Spectroscopy Study of Topological Quantum Materials." Annual Review of Materials Research 50, no. 1 (2020): 131–53. http://dx.doi.org/10.1146/annurev-matsci-070218-121852.

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The recently discovered topological quantum materials (TQMs) have electronic structures that can be characterized by certain topological invariants. In these novel materials, the unusual bulk and surface electrons not only give rise to many exotic physical phenomena but also foster potential new technological applications. To characterize the unusual electronic structures of these new materials, investigators have used angle-resolved photoemission spectroscopy (ARPES) as an effective experimental tool to directly visualize the unique bulk and surface electronic structures of TQMs. In this revi
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Bansil, A., R. S. Markiewicz, S. Sahrakorpi, Hsin Lin, M. Lindroos, and J. Nieminen. "Modeling electronic structure and highly resolved spectroscopies of cuprates: ARPES, RIXS and STM." Physica C: Superconductivity and its Applications 460-462 (September 2007): 222–25. http://dx.doi.org/10.1016/j.physc.2007.03.281.

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Radin, Max, and Alexander Kunitsa. "(Invited) Elucidating Redox Mechanisms in Battery Materials through Resonant Inelastic X-Ray Spectroscopy (RIXS)." ECS Meeting Abstracts MA2024-02, no. 26 (2024): 2085. https://doi.org/10.1149/ma2024-02262085mtgabs.

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Novel battery materials offer the promise of greatly increased energy densities for automative and other applications. However, their practical adoption is often limited by problems in electrochemical performance, such as poor rate capability, voltaic efficiency, and cyclability. Resonant Inelastic X-ray Spectroscopy (RIXS) has become a valuable tool for understanding the redox mechanisms in such materials, representing a first step towards solving problems in electrochemical performance. In many cases, however, the underlying origins of RIXS features are unclear. For example, redox mechanisms
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Xu, R. Z., X. Gu, W. X. Zhao, et al. "Development of a laser-based angle-resolved-photoemission spectrometer with sub-micrometer spatial resolution and high-efficiency spin detection." Review of Scientific Instruments 94, no. 2 (2023): 023903. http://dx.doi.org/10.1063/5.0106351.

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Angle-resolved photoemission spectroscopy with sub-micrometer spatial resolution (μ-ARPES), has become a powerful tool for studying quantum materials. To achieve sub-micrometer or even nanometer-scale spatial resolution, it is important to focus the incident light beam (usually from synchrotron radiation) using x-ray optics, such as the zone plate or ellipsoidal capillary mirrors. Recently, we developed a laser-based μ-ARPES with spin-resolution (LMS-ARPES). The 177 nm laser beam is achieved by frequency-doubling a 355 nm beam using a KBBF crystal and subsequently focused using an optical lens
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Chang, Tay-Rong, Qiangsheng Lu, Xiaoxiong Wang, et al. "Band Topology of Bismuth Quantum Films." Crystals 9, no. 10 (2019): 510. http://dx.doi.org/10.3390/cryst9100510.

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Bismuth has been the key element in the discovery and development of topological insulator materials. Previous theoretical studies indicated that Bi is topologically trivial and it can transform into the topological phase by alloying with Sb. However, recent high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements strongly suggested a topological band structure in pure Bi, conflicting with the theoretical results. To address this issue, we studied the band structure of Bi and Sb films by ARPES and first-principles calculations. The quantum confinement effectively enlarges
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Cao, Y., D. G. Mazzone, D. Meyers, et al. "Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (2019): 20170480. http://dx.doi.org/10.1098/rsta.2017.0480.

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Many remarkable properties of quantum materials emerge from states with intricate coupling between the charge, spin and orbital degrees of freedom. Ultrafast photo-excitation of these materials holds great promise for understanding and controlling the properties of these states. Here, we introduce time-resolved resonant inelastic X-ray scattering (tr-RIXS) as a means of measuring the charge, spin and orbital excitations out of equilibrium. These excitations encode the correlations and interactions that determine the detailed properties of the states generated. After outlining the basic princip
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Chaluvadi, Sandeep, Debashis Mondal, Chiara Bigi, et al. "Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser." Coatings 11, no. 3 (2021): 276. http://dx.doi.org/10.3390/coatings11030276.

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Research on ultrathin quantum materials requires full control of the growth and surface quality of the specimens in order to perform experiments on their atomic structure and electron states leading to ultimate analysis of their intrinsic properties. We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectros
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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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9

Nowak, Kamil, Michał Jurczyszyn, Maciej Chrobak, et al. "Influence of Doping on the Topological Surface States of Crystalline Bi2Se3 Topological Insulators." Materials 15, no. 6 (2022): 2083. http://dx.doi.org/10.3390/ma15062083.

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We present STM/STS, ARPES and magnetotransport studies of the surface topography and electronic structure of pristine Bi2Se3 in comparison to Bi1.96Mg0.04Se3 and Bi1.98Fe0.02Se3. The topography images reveal a large number of complex, triangle-shaped defects at the surface. The local electronic structure of both the defected and non-defected regions is examined by STS. The defect-related states shift together with the Dirac point observed in the undefected area, suggesting that the local electronic structure at the defects is influenced by doping in the same way as the electronic structure of
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Strocov, V. N., F. Lechermann, A. Chikina, et al. "Dimensionality of mobile electrons at x-ray-irradiated LaAlO3/SrTiO3 interfaces." Electronic Structure 4, no. 1 (2022): 015003. http://dx.doi.org/10.1088/2516-1075/ac4e74.

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Abstract Electronic structure of LaAlO3/SrTiO3 (LAO/STO) samples, grown at low oxygen pressure and post-annealed ex situ, was investigated by soft-x-ray ARPES focussing on the Fermi momentum (k F) of the mobile electron system (MES). X-ray irradiation of these samples at temperatures below 100 K creates oxygen vacancies (VOs) injecting Ti t 2g-electrons into the MES. At this temperature the oxygen out-diffusion is suppressed, and the VOs should appear mostly in the top STO layer. The x-ray generated MES demonstrates, however, a pronounced three-dimensional (3D) behavior as evidenced by variati
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Shen, Zhi-Xun. "Angle-resolved photoemission spectroscopy (ARPES): probing electronic structure and many-body interactions." Coshare Science 2 (May 23, 2024): 1–43. http://dx.doi.org/10.61109/cs.202405.130.

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Complex phenomenon in quantum materials is a major theme of physics today. As better controlled model systems, a sophisticated understanding of the universality and diversity of these solids may lead to revelations well beyond themselves. Angle-resolved photoemission spectroscopy (ARPES), formulated after Einstein’s photoelectric effect, has been a key tool to uncover the microscopic processes of the electrons that give rise to the rich physics in these solids. Over the last three decades, the improved resolution and carefully matched experiments have been the keys to turn this technique into
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Villarreal, Renan. "(Invited, Digital Presentation) Single-Atom Quantum Magnetism in 2D Materials." ECS Meeting Abstracts MA2022-01, no. 12 (2022): 874. http://dx.doi.org/10.1149/ma2022-0112874mtgabs.

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With the advent of 2D materials, the playground to study spins in dilute and non-dilute phases has expanded. This is appealing for utilizing the additional degrees of freedom of electron systems such as spin and valley and, from the fundamental point of view, to better understand atomic scale magnetic phenomena in low dimensional materials. Dilute magnetism in 2D materials can lead to complex magnetic phenomena (e.g., Kondo effect, RKKY-interactions, quantum relaxation and coherence), with potential for applications in spintronics (e.g., spin FETs) and quantum technologies (e.g., single-atom q
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13

Na, M. X., A. K. Mills, F. Boschini, et al. "Direct determination of mode-projected electron-phonon coupling in the time domain." Science 366, no. 6470 (2019): 1231–36. http://dx.doi.org/10.1126/science.aaw1662.

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Ultrafast spectroscopies have become an important tool for elucidating the microscopic description and dynamical properties of quantum materials. In particular, by tracking the dynamics of nonthermal electrons, a material’s dominant scattering processes can be revealed. Here, we present a method for extracting the electron-phonon coupling strength in the time domain, using time- and angle-resolved photoemission spectroscopy (TR-ARPES). This method is demonstrated in graphite, where we investigate the dynamics of photoinjected electrons at the K¯ point, detecting quantized energy-loss processes
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14

Bouravleuv, A. D., L. L. Lev, C. Piamonteze, et al. "Electronic structure of (In,Mn)As quantum dots buried in GaAs investigated by soft-x-ray ARPES." Nanotechnology 27, no. 42 (2016): 425706. http://dx.doi.org/10.1088/0957-4484/27/42/425706.

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MD ALIF HOSSEN SANY, Zeeshan Khan, Hanif Ullah, Alamgir Khan, Abdur Rahman, and Muhammad Javed. "CHEMICAL AND PHYSICAL FRONTIERS IN HIGH-TEMPERATURE SUPERCONDUCTIVITY." Kashf Journal of Multidisciplinary Research 2, no. 02 (2025): 112–26. https://doi.org/10.71146/kjmr273.

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High-temperature superconductivity remains a major frontier in condensed matter physics, offering potential breakthroughs in energy transmission, quantum computing, and advanced electronic applications. This review explores the chemical and physical principles underlying high-temperature superconductors (HTS), emphasizing their synthesis, structural characteristics, and electronic properties. The discovery of cup rate and iron-based superconductors has challenged conventional BCS theory, introducing novel mechanisms such as strong electron correlations and unconventional pairing symmetries. Ad
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Bigi, Chiara, Pranab K. Das, Davide Benedetti, et al. "Very efficient spin polarization analysis (VESPA): new exchange scattering-based setup for spin-resolved ARPES at APE-NFFA beamline at Elettra." Journal of Synchrotron Radiation 24, no. 4 (2017): 750–56. http://dx.doi.org/10.1107/s1600577517006907.

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Complete photoemission experiments, enabling measurement of the full quantum set of the photoelectron final state, are in high demand for studying materials and nanostructures whose properties are determined by strong electron and spin correlations. Here the implementation of the new spin polarimeter VESPA (Very Efficient Spin Polarization Analysis) at the APE-NFFA beamline at Elettra is reported, which is based on the exchange coupling between the photoelectron spin and a ferromagnetic surface in a reflectometry setup. The system was designed to be integrated with a dedicated Scienta-Omicron
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Nilforoushan, Niloufar, Michele Casula, Adriano Amaricci, et al. "Moving Dirac nodes by chemical substitution." Proceedings of the National Academy of Sciences 118, no. 33 (2021): e2108617118. http://dx.doi.org/10.1073/pnas.2108617118.

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Dirac fermions play a central role in the study of topological phases, for they can generate a variety of exotic states, such as Weyl semimetals and topological insulators. The control and manipulation of Dirac fermions constitute a fundamental step toward the realization of novel concepts of electronic devices and quantum computation. By means of Angle-Resolved Photo-Emission Spectroscopy (ARPES) experiments and ab initio simulations, here, we show that Dirac states can be effectively tuned by doping a transition metal sulfide, BaNiS2, through Co/Ni substitution. The symmetry and chemical cha
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Su, Shu-Hsuan, Jen-Te Chang, Pei-Yu Chuang, et al. "Epitaxial Growth and Structural Characterizations of MnBi2Te4 Thin Films in Nanoscale." Nanomaterials 11, no. 12 (2021): 3322. http://dx.doi.org/10.3390/nano11123322.

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The intrinsic magnetic topological insulator MnBi2Te4 has attracted much attention due to its special magnetic and topological properties. To date, most reports have focused on bulk or flake samples. For material integration and device applications, the epitaxial growth of MnBi2Te4 film in nanoscale is more important but challenging. Here, we report the growth of self-regulated MnBi2Te4 films by the molecular beam epitaxy. By tuning the substrate temperature to the optimal temperature for the growth surface, the stoichiometry of MnBi2Te4 becomes sensitive to the Mn/Bi flux ratio. Excessive and
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Meng, Qinghao, Fan Yu, Gan Liu та ін. "Thickness-Dependent Evolutions of Surface Reconstruction and Band Structures in Epitaxial β–In2Se3 Thin Films". Nanomaterials 13, № 9 (2023): 1533. http://dx.doi.org/10.3390/nano13091533.

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Ferroelectric materials have received great attention in the field of data storage, benefiting from their exotic transport properties. Among these materials, the two-dimensional (2D) In2Se3 has been of particular interest because of its ability to exhibit both in-plane and out-of-plane ferroelectricity. In this article, we realized the molecular beam epitaxial (MBE) growth of β–In2Se3 films on bilayer graphene (BLG) substrates with precisely controlled thickness. Combining in situ scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES) measurements, we found t
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Merckling, Clement, Islam Ahmed, Tsang Hsuan Tsang, Moloud Kaviani, Jan Genoe, and Stefan De Gendt. "(Invited) Integrated Perovskites Oxides on Silicon: From Optical to Quantum Applications." ECS Meeting Abstracts MA2022-01, no. 19 (2022): 1060. http://dx.doi.org/10.1149/ma2022-01191060mtgabs.

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With the slowing down of Moore’s law, related to conventional scaling of integrated circuits, alternative technologies will require research effort for pushing the limits of new generations of electronic or photonic devices. Perovskite oxides with the ABO3 chemical formula have a very wide range of interesting intrinsic properties such as metal-insulator transition, ferroelectricity, pyroelectricity, piezoelectricity, ferromagnetic and superconductivity. For the integration of such oxides, it is of great interest to combine their properties with traditional electronic, memory and optical devic
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John, Ataman Ose, Molua Ogom Collins, and Vwavware Oruaode Jude. "Electronic Band Structure of Heavy Fermion Compound Cecoge2." Journal of Energy Engineering and Thermodynamics, no. 36 (September 18, 2023): 22–31. http://dx.doi.org/10.55529/jeet.36.22.31.

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The following article provides a thorough examination of the electronic band structure observed in heavy fermion compounds, which are a type of material that has received considerable interest within the realm of condensed matter physics. The compounds under consideration exhibit significantly high charge carrier masses, which give rise to intriguing electronic phenomena when subjected to low temperatures. Through the analysis of electronic band structures, valuable insights can be obtained regarding the distinctive characteristics displayed by these captivating materials. The research centers
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Zhu Xiaoxian, Gao Yitan, Wang Yiming, and Zhao Kun. "Applications of time-of-flight photoelectron spectrometers in ultrafast optics experiments." Acta Physica Sinica 74, no. 15 (2025): 0. https://doi.org/10.7498/aps.74.20250698.

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Time-of-Flight Photoelectron Spectroscopy (TOF-PES) has emerged as a cornerstone diagnostic tool in attosecond science and ultrafast dynamics, offering exceptional energy and temporal resolution. This article presents a comprehensive review of TOF-PES technology, its underlying principles, and its crucial role in attosecond metrology. The first part introduces the historical development of TOF methods, from early ion mass spectrometry to modern photoelectron applications, detailing key innovations such as energy and spatial focusing, magnetic shielding, and delay-line detectors. The implementa
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Yinpeng Zhong, Jiatai Feng, and Xia Yang. "Advances in Free-Electron-Laser based scattering techniques and spectroscopic methods." Acta Physica Sinica, 2024, 0. http://dx.doi.org/10.7498/aps.73.20240930.

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In 2005, the FLASH soft X-ray free-electron laser (FEL) in Hamburg, Germany, achieved its first lasing, marking the beginning of an intensive phase of global FEL construction. Subsequently, the United States, Japan, South Korea, China, Italy, and Switzerland have all commenced building this type of photon facility. Recently, the new generation of FEL has started to utilize superconducting acceleration technology to achieve high-repetition-rate pulse output, thereby improving experimental efficiency. Currently completed facilities include the European XFEL, with ongoing constructions of the LCL
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Zhou Ke-Jin. "Resonant Inelastic X-ray Scattering Applications in Quantum Materials." Acta Physica Sinica, 2024, 0. http://dx.doi.org/10.7498/aps.73.20241009.

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The essence of quantum materials lies in the intricate coupling among charge, spin, orbital and lattice degrees of freedom. Although X-ray photoemission spectroscopy and inelastic neutron scattering are advantegous in detecting fermionic single-particle spectral function and bosonic spin excitations in quantum materials, respectively, probing other bosonic collective excitations especially their coupling is not possible until the establishment of the advanced resonant inelastic X-ray scattering (RIXS). In the past decades, RIXS has flourished with continuously improved energy resolution which
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Yang, Jiangang, Jianwei Huang, Lin Zhao, and X. J. Zhou. "Angle-Resolved Photoemission Spectroscopy Study on Transition-Metal Kagome Materials." Chinese Physics B, February 17, 2025. https://doi.org/10.1088/1674-1056/adb689.

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Abstract Angle-resolved photoemission spectroscopy (ARPES) has become a cornerstone technique for elucidating the electronic structures of emergent quantum materials. Among these, kagome materials—distinguished by their two-dimensional lattice of corner-sharing triangles—provide a fertile ground for investigating exotic quantum phenomena, driven by geometric frustration, electronic correlation, and topology. In this review, we present a overview of recent ARPES studies on transition-metal kagome materials. We first outline the fundamental features of their electronic structure, including van H
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Andresen, Nord, Christos Bakalis, Peter Denes, et al. "A low noise CMOS camera system for 2D resonant inelastic soft X-ray scattering." Frontiers in Physics 11 (November 20, 2023). http://dx.doi.org/10.3389/fphy.2023.1285379.

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Resonant Inelastic X-ray Scattering (RIXS) is a powerful spectroscopic technique to study quantum properties of materials in the bulk. A novel variant of RIXS, called 2D RIXS, enables concurrent measurement of the scattered X-ray spectrum for a wide range of input energies, improving on the typically low throughput of 1D RIXS. In the soft X-ray domain, 2D RIXS demands an X-ray camera system with small pixels, large area, high quantum efficiency and low noise to limit the false detection rate in long duration exposures. We designed and implemented a 7.5 Megapixel back-illuminated CMOS detector
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Mitrano, M., S. Johnston, Young-June Kim, and M. P. M. Dean. "Exploring Quantum Materials with Resonant Inelastic X-Ray Scattering." Physical Review X 14, no. 4 (2024). https://doi.org/10.1103/physrevx.14.040501.

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Understanding quantum materials—solids in which interactions among constituent electrons yield a great variety of novel emergent quantum phenomena—is a forefront challenge in modern condensed matter physics. This goal has driven the invention and refinement of several experimental methods, which can spectroscopically determine the elementary excitations and correlation functions that determine material properties. Here we focus on the future experimental and theoretical trends of resonant inelastic x-ray scattering (RIXS), which is a remarkably versatile and rapidly growing technique for probi
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Boschini, Fabio, Marta Zonno, and Andrea Damascelli. "Time-resolved ARPES studies of quantum materials." Reviews of Modern Physics 96, no. 1 (2024). http://dx.doi.org/10.1103/revmodphys.96.015003.

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Huang, Jianwei, Ziqin Yue, Andrey Baydin, et al. "Angle-resolved photoemission spectroscopy with an in situ tunable magnetic field." Review of Scientific Instruments 94, no. 9 (2023). http://dx.doi.org/10.1063/5.0157031.

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Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool for probing the momentum-resolved single-particle spectral function of materials. Historically, in situ magnetic fields have been carefully avoided as they are detrimental to the control of photoelectron trajectory during the photoelectron detection process. However, magnetic field is an important experimental knob for both probing and tuning symmetry-breaking phases and electronic topology in quantum materials. In this paper, we introduce an easily implementable method for realizing an in situ tunable magnetic field at the s
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Wang, Yang, and Maciej Dendzik. "Recent Progress in Angle-resolved Photoemission Spectroscopy." Measurement Science and Technology, December 27, 2023. http://dx.doi.org/10.1088/1361-6501/ad1915.

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Abstract Angle-resolved photoemission spectroscopy (ARPES) is a well-established experimental technique that allows probing of the electronic structure of quantum materials using relatively high-energy photons. ARPES has been extensively used to study important classes of materials such as topological insulators, high-temperature superconductors, two-dimensional materials or interface systems. Although the technique was originally developed over 60 years ago, the last decade has witnessed significant advancements in instrumentation. In this review, we survey recent progress in ARPES, with a fo
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Boban, Honey, Mohammed Qahosh, Xiao Hou, et al. "Scattering makes a difference in circular dichroic angle-resolved photoemission." Physical Review B 111, no. 11 (2025). https://doi.org/10.1103/physrevb.111.115127.

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Recent years have witnessed a steady progress towards blending two-dimensional quantum materials into technology, with future applications often rooted in the electronic structure. Since crossings and inversions of electronic bands with different orbital characters determine intrinsic quantum transport properties, knowledge of the orbital character is essential. Here, we benchmark angle-resolved photoelectron emission spectroscopy (ARPES) as a tool to experimentally derive orbital characters. For this purpose we study the valence electronic structure of two technologically relevant quantum mat
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Thomas, Jinu, Debshikha Banerjee, Alberto Nocera, and Steven Johnston. "Theory of Electron-Phonon Interactions in Extended Correlated Systems Probed by Resonant Inelastic X-Ray Scattering." Physical Review X 15, no. 2 (2025). https://doi.org/10.1103/physrevx.15.021030.

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An emerging application of resonant inelastic x-ray scattering (RIXS) is the study of lattice excitations and electron-phonon (e-ph) interactions in quantum materials. Despite the growing importance of this area of research, the community lacks a complete understanding of how the RIXS process excites the lattice and how these excitations encode information about the e-ph interactions. Here, we present a detailed study of the RIXS spectra of the Hubbard-Holstein model defined on extended one-dimensional lattices. Using the density matrix renormalization group method, we compute the RIXS respons
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Lim, Chan-young, Sunghun Kim, Sung Won Jung, Jinwoong Hwang, and Yeongkwan Kim. "Recent Technical Advancements in ARPES: Unveiling Quantum Materials." Current Applied Physics, February 2024. http://dx.doi.org/10.1016/j.cap.2024.01.010.

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Schüler, Michael, Thorsten Schmitt, and Philipp Werner. "Probing magnetic orbitals and Berry curvature with circular dichroism in resonant inelastic X-ray scattering." npj Quantum Materials 8, no. 1 (2023). http://dx.doi.org/10.1038/s41535-023-00538-x.

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AbstractResonant inelastic X-ray scattering (RIXS) can probe localized excitations at selected atoms in materials, including particle-hole transitions between the valence and conduction bands. These transitions are governed by fundamental properties of the corresponding Bloch wave functions, including orbital and magnetic degrees of freedom, and quantum geometric properties such as the Berry curvature. In particular, orbital angular momentum (OAM), which is closely linked to the Berry curvature, can exhibit a nontrivial momentum dependence. We demonstrate how information on such OAM textures c
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Balduini, F., L. Rocchino, A. Molinari, et al. "Probing the Shape of the Weyl Fermi Surface of NbP Using Transverse Electron Focusing." Physical Review Letters 133, no. 9 (2024). http://dx.doi.org/10.1103/physrevlett.133.096601.

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Weyl semimetals are defined by their unique Fermi surface, comprising pairs of Weyl points of opposite chirality, connected through topological surface states. Angle-resolved photoemission spectroscopy (ARPES) has been used to verify the existence of the Weyl points and the Fermi arcs. However, ARPES is limited in resolution, leading to significant uncertainty when characterizing the shape of the Fermi surface of semimetals and measuring features such as the distance between the Weyl points. Here, to surpass the resolution of ARPES, we combine quantum oscillation measurements with transverse e
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Jiang, Zhicheng, Jiayu Liu, Zhengtai Liu, and Dawei Shen. "A review of angle-resolved photoemission spectroscopy study on topological mangetic material family of MnBi2Te4." Electronic Structure, December 13, 2022. http://dx.doi.org/10.1088/2516-1075/acab47.

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Abstract The MnBi2Te4 family compounds have drawn enormous attention in recent years due to their potential to realize the high-temperature quantum anomalous Hall effect (QAHE). As one of the most direct techniques to probe electronic structure, angle-resolved photoemission spectroscopy (ARPES) has been widely applied to investigate the interplay between the magnetism and non-trivial topological band structure of MnBi2Te4 family materials. Here, we briefly review some of latest progress of ARPES on MnBi2Te4·(Bi2Te3) (n=0, 1, 2, 3) and analogous MnSb2Te4·(Sb2Te3) (n=1,2) series of materials. As
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Cai, Yongqing, Yuan Wang, Zhanyang Hao, et al. "Emergence of quantum confinement in topological kagome superconductor CsV3Sb5." Communications Materials 5, no. 1 (2024). http://dx.doi.org/10.1038/s43246-024-00461-z.

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AbstractQuantum confinement is a restriction on the motion of electrons in a material to specific region, resulting in discrete energy levels rather than continuous energy bands. In certain materials, quantum confinement could dramatically reshape the electronic structure and properties of the surface with respect to the bulk. Here, in the recently discovered kagome superconductors CsV3Sb5, we unveil the dominant role of quantum confinement in determining their surface electronic structure. Combining angle-resolved photoemission spectroscopy (ARPES) measurement and density-functional theory si
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38

Yao, Mengyu, Martin Gutierrez-Amigo, Subhajit Roychowdhury, et al. "Observation of chiral surface state in superconducting NbGe2." Physical Review Materials 9, no. 3 (2025). https://doi.org/10.1103/physrevmaterials.9.034803.

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The interplay between topology and superconductivity in quantum materials presents opportunities for exploring novel quantum phenomena. In this study, we investigate the topological properties and superconductivity of the nonsymmorphic chiral superconductor NbGe2 using high-resolution angle-resolved photoemission spectroscopy (ARPES), transport measurements, and calculations. The ARPES data revealed exotic chiral surface states on the (100) surface originating from the inherent chiral crystal structure. Our calculations suggest that NbGe2's electronic structure may include elusive Weyl fermion
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39

He, Yu, Frederick J. Walker, Charles H. Ahn, and Sohrab Ismail‐Beigi. "Probing the Wannier function of Crystalline Solids with Angle‐Resolved Photoemission Spectroscopy." Advanced Materials Interfaces, August 25, 2024. http://dx.doi.org/10.1002/admi.202400427.

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AbstractAngle‐resolved photoemission spectroscopy (ARPES) has been a widely adopted technique in the studies of quantum materials. The surface sensitivity of photoelectric effect also makes it a powerful tool to investigate surface and shallow interface phenomena. While an overwhelming majority of its use focuses on extracting the eigenenergy of the electron Bloch states in momentum space, attempts to extract information of the wave function via ARPES has been limited to molecular systems. In this perspective, it is proposed and advocated use ARPES to investigate and unravel wave function prop
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40

Iwasawa, Hideaki, Tetsuro Ueno, Takahiko Masui, and Setsuko Tajima. "Unsupervised clustering for identifying spatial inhomogeneity on local electronic structures." npj Quantum Materials 7, no. 1 (2022). http://dx.doi.org/10.1038/s41535-021-00407-5.

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AbstractSpatial inhomogeneity on the electronic structure is one of the vital keys to provide a better understanding of the emergent quantum phenomenon. Given the recent developments on spatially resolved ARPES (ARPES: angle-resolved photoemission spectroscopy), the information on the spatial inhomogeneity on the local electronic structure is now accessible. However, the next challenge becomes apparent as the conventional analysis encounters difficulty handling a large volume of a spatial mapping dataset, typically generated in the spatially resolved ARPES experiments. Here, we propose a machi
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41

Chikina, A., V. Rosendal, H. Li, et al. "Intrinsic three-dimensional topology in SrNbO3 films." Physical Review B 111, no. 15 (2025). https://doi.org/10.1103/physrevb.111.155146.

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Transition metal oxides, with their wide range of electronic and magnetic properties, offer a remarkable platform for developing future electronics based on unconventional quantum phenomena, such as topological phases. The formation of topologically nontrivial states is linked to crystalline symmetry, spin-orbit coupling, and magnetic ordering. Here, by employing angle-resolved photoemission spectroscopy (ARPES), supported by density functional theory (DFT) calculations, we demonstrated that intrinsic octahedral rotations in SrNbO3 films drive the emergence of non-trivial band topology. Specif
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42

Li, Yiwei, Qiang Wan, and Nan Xu. "Recent Advances in Moiré Superlattice Systems by Angle‐Resolved Photoemission Spectroscopy." Advanced Materials, September 9, 2023. http://dx.doi.org/10.1002/adma.202305175.

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AbstractThe last decade has witnessed a flourish in two‐dimensional (2D) materials including graphene and transition metal dichalcogenides (TMDs) as atomic‐scale Legos. Artificial moiré superlattices via stacking 2D materials with a twist angle and/or a lattice mismatch have recently become a fertile playground exhibiting a plethora of emergent properties beyond their building blocks. These rich quantum phenomena stem from their nontrivial electronic structures that have been effectively tuned by the moiré periodicity. Modern angle‐resolved photoemission spectroscopy (ARPES) can directly visua
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43

Figgemeier, T., M. Ünzelmann, P. Eck, et al. "Imaging Orbital Vortex Lines in Three-Dimensional Momentum Space." Physical Review X 15, no. 1 (2025). https://doi.org/10.1103/physrevx.15.011032.

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We report the experimental discovery of orbital vortex lines in the three-dimensional (3D) band structure of a topological semimetal. Combining linear and circular dichroism in soft x-ray angle-resolved photoemission (SX-ARPES) with first-principles theory, we image the winding of atomic orbital angular momentum, thereby revealing—and determining the location of—lines of vorticity in full 3D momentum space. We determine the core of the orbital angular momentum vortex to host an almost movable, twofold, spin-degenerate Weyl nodal line, a topological feature predicted to occur in certain nonsymm
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Peng, Yawen, Ren He, Peng Li, et al. "Flat Band Generation Through Interlayer Geometric Frustration in Intercalated Transition Metal Dichalcogenides." Small, January 26, 2025. https://doi.org/10.1002/smll.202409535.

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AbstractElectronic flat bands can lead to rich many‐body quantum phases by quenching the electron's kinetic energy and enhancing many‐body correlation. The reduced bandwidth can be realized by either destructive quantum interference in frustrated lattices, or by generating heavy band folding with avoided band crossing in Moiré superlattices. Here a general approach is proposed to introduce flat bands into widely studied transition metal dichalcogenide (TMD) materials by dilute intercalation. A flat band with vanishing dispersion is observed by angle‐resolved photoemission spectroscopy (ARPES)
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45

Pelliciari, Jonathan, Kenji Ishii, Yaobo Huang, et al. "Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xPx)2." Communications Physics 2, no. 1 (2019). http://dx.doi.org/10.1038/s42005-019-0236-3.

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Abstract Unconventional superconductivity arises at the border between the strong coupling regime with local magnetic moments and the weak coupling regime with itinerant electrons, and stems from the physics of criticality that dissects the two. Unveiling the nature of the quasiparticles close to quantum criticality is fundamental to understand the phase diagram of quantum materials. Here, using resonant inelastic x-ray scattering (RIXS) and $${\rm{Fe}}-{{\rm{K}}}_{\beta }$$ Fe − K β emission spectroscopy (XES), we visualize the coexistence and evolution of local magnetic moments and collectiv
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46

Lu, Shengyue, Yeqinbo Zhang, Jingze Li, Xueyan Ma, Yongkai Deng, and Yunquan Liu. "A newly designed laser-based time- and angle-resolved photoelectron spectroscopy with a time-of-flight electron analyzer." AIP Advances 15, no. 1 (2025). https://doi.org/10.1063/5.0230542.

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Angle-resolved photoemission spectroscopy can directly detect the energy and momentum resolved electronic structure of solids, serving as a central role in the discovery and understanding of quantum materials. Here, we report the development of a novel time-resolved ARPES setup equipped with a table-top vacuum ultraviolet laser source with a photon energy of 10.8 eV and a time-of-flight analyzer. The light source is obtained through the generation of ninth harmonics of a 1030 nm Yb fiber-based amplified laser (290 fs, 100 μJ). The photon flux can reach 5 × 1012 photons/s at 333 kHz. We demonst
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Wong, Deniz Po, Christian Schulz, and Maciej Bartkowiak. "PEAXIS: A RIXS and XPS Endstation for Solid-State Quantum and Energy Materials at BESSY II." Journal of large-scale research facilities JLSRF 7 (July 8, 2021). http://dx.doi.org/10.17815/jlsrf-7-177.

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PEAXIS (Photo Electron Analysis and resonant X-ray Inelastic Spectroscopy) is a dedicated endstation installed at the beamline U41-PEAXIS that offers high resolution soft X-ray spectroscopy measurements with incident photon energies ranging from 180 – 1600 eV. The endstation combines two X-ray spectroscopic techniques, X-ray photoelectron spectroscopy (XPS) and resonant inelastic soft X-ray scattering (RIXS), which are important for probing the electronic structure and local and collective excitations of solid-state materials. It features a continuous variation of scattering angle under UHV co
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48

Yadav, Rohit, Sandra Benter, and Rainer Timm. "Localized trimers inducing metallic states in sub-monolayer thin Bi films on InSb(111)A." Physical Review Materials 9, no. 6 (2025). https://doi.org/10.1103/mp9b-hgz1.

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Low-dimensional topological states have transformed our understanding of charge transportation through quantum materials. Many relevant observations have been connected to bismuth (Bi) containing materials or ultrathin Bi films. Here, we studied sub-monolayer amounts of Bi deposition on the In-terminated InSb(111)A surface using various complementary surface science techniques. Bi deposition at elevated sample temperature results in well-ordered (2×2) and (2√3×2√3)−R30∘ surface reconstructions. Scanning tunneling microscopy/spectroscopy (STM/S) data show an enhanced density of states at the in
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49

Jones, Alfred J. H., Paulina Majchrzak, Klara Volckaert, et al. "A spatial- and angle-resolved photoemission spectroscopy beamline based on capillary optics at ASTRID2." Review of Scientific Instruments 96, no. 2 (2025). https://doi.org/10.1063/5.0240744.

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Angle-resolved photoemission spectroscopy (ARPES) with spatial resolution is emerging as a powerful investigative tool for the study of operational mesoscale devices and quantum materials. Here, we introduce AU-SGM4, an extreme ultraviolet beamline based at the ASTRID2 synchrotron, which is designed around an achromatic elliptical capillary optic that focuses the synchrotron light down to a lateral beam spot size of 4 μm. The beamline offers a low photon energy range of 12–150 eV, ideal for probing detailed energy- and momentum-resolved electronic structures of materials. We utilize a custom-m
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50

Kurumaji, Takashi, Jorge I. Facio, Natsuki Mitsuishi, et al. "Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution." Advanced Science, May 8, 2025. https://doi.org/10.1002/advs.202501669.

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AbstractNodal‐line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal‐line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent to all non‐centrosymmetric achiral crystal lattices. The electronic structure of candidate KNL semimetal YAuGe is investigated by angle‐resolved photoemission spectroscopy (ARPES) and quantum oscillations as well as by density functional theory (DFT) calculations. DFT has revealed that YAuGe hosts KNLs on the Γ‐A‐L‐M plane of the Brillouin zone, that a
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