Angle-resolved photoemission spectroscopy
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Magnetic Weyl semimetal phase in a Kagomé crystal Open
Magnetic Weyl semimetals Weyl semimetals (WSMs)—materials that host exotic quasiparticles called Weyl fermions—must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identifi…
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Angle-resolved photoemission studies of quantum materials Open
The physics of quantum materials is dictated by many-body interactions and mathematical concepts such as symmetry and topology that have transformed our understanding of matter. Angle-resolved photoemission spectroscopy (ARPES), which dire…
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Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe2 Open
Topological semimetals have recently attracted extensive research interests as host materials to condensed matter physics counterparts of Dirac and Weyl fermions originally proposed in high energy physics. Although Lorentz invariance is re…
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Signature of type-II Weyl semimetal phase in MoTe2 Open
Topological Weyl semimetal (TWS), a new state of quantum matter, has sparked enormous research interest recently. Possessing unique Weyl fermions in the bulk and Fermi arcs on the surface, TWSs offer a rare platform for realizing many exot…
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Determination of band offsets, hybridization, and exciton binding in 2D semiconductor heterostructures Open
Photoemission measurements on exfoliated 2D heterostructures reveal detailed electronic structure and hybridization effects.
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Direct evidence for flat bands in twisted bilayer graphene from nano-ARPES Open
Transport experiments in twisted bilayer graphene revealed multiple superconducting domes separated by correlated insulating states. These properties are generally associated with strongly correlated states in a flat mini-band of the hexag…
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Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser Open
A deeper look into iron selenide In the past 10 years, iron-based superconductors have created more puzzles than they have helped resolve. Some of the most fundamental outstanding questions are how strong the interactions are and what the …
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Epitaxial Graphene on SiC: A Review of Growth and Characterization Open
This review is devoted to one of the most promising two-dimensional (2D) materials, graphene. Graphene can be prepared by different methods and the one discussed here is fabricated by the thermal decomposition of SiC. The aim of the paper …
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Band Alignments, Valence Bands, and Core Levels in the Tin Sulfides SnS, SnS<sub>2</sub>, and Sn<sub>2</sub>S<sub>3</sub>: Experiment and Theory Open
Tin sulfide solar cells show relatively poor efficiencies despite attractive photovoltaic properties, and there is difficulty in identifying separate phases, which are also known to form during Cu2ZnSnS4 depositions. We present X-ray photo…
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Emergence of a Metal–Insulator Transition and High-Temperature Charge-Density Waves in VSe<sub>2</sub> at the Monolayer Limit Open
Emergent phenomena driven by electronic reconstructions in oxide heterostructures have been intensively discussed. However, the role of these phenomena in shaping the electronic properties in van der Waals heterointerfaces has hitherto not…
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Discovery of Orbital Selective Cooper Pairing in FeSe Open
FeSe is the focus of intense research interest because of its unusual non-magnetic nematic state and because it forms the basis for achieving the highest critical temperatures of any iron-based superconductor. However, its Cooper pairing m…
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Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals Open
The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature and demonstrates a novel type of anomalous surface state, the Fermi arc. Like topological insulators, the bulk topological …
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Magnetism and charge density wave order in kagome FeGe Open
Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the feature…
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Anisotropic photoemission time delays close to a Fano resonance Open
Electron correlation and multielectron effects are fundamental interactions that govern many physical and chemical processes in atomic, molecular and solid state systems. The process of autoionization, induced by resonant excitation of ele…
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Quantum transport in Dirac and Weyl semimetals: a review Open
Topological semimetals are well known for the linear energy band dispersion in the bulk state and topologically protected surface state with arc-like Fermi surface. The angle resolved photoemission spectroscopy experiments help confirm the…
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A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy Open
A synchrotron radiation beamline in the photon energy range of 18-240 eV and an electron spectroscopy end station have been constructed at the 3 GeV Diamond Light Source storage ring. The instrument features a variable polarisation undulat…
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Review of 2D superconductivity: the ultimate case of epitaxial monolayers Open
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Signatures of a time-reversal symmetric Weyl semimetal with only four Weyl points Open
Through intense research on Weyl semimetals during the past few years, we have come to appreciate that typical Weyl semimetals host many Weyl points. Nonetheless, the minimum nonzero number of Weyl points allowed in a time-reversal invaria…
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Photoemission Spectroscopy Characterization of Halide Perovskites Open
Controlling the surface and interface properties of halide perovskites (HaPs) materials is key to improve performance and stability of HaP‐based optoelectronic devices such as solar cells. Here, an overview is given on the use of different…
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Strain Control of Fermiology and Many-Body Interactions in Two-Dimensional Ruthenates Open
Here we demonstrate how the Fermi surface topology and quantum many-body interactions can be manipulated via epitaxial strain in the spin-triplet superconductor Sr_{2}RuO_{4} and its isoelectronic counterpart Ba_{2}RuO_{4} using oxide mole…
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Photoemission perspective on pseudogap, superconducting fluctuations, and charge order in cuprates: a review of recent progress Open
In the course of seeking the microscopic mechanism of superconductivity in cuprate high temperature superconductors, the pseudogap phase- the very abnormal 'normal' state on the hole-doped side- has proven to be as big of a quandary as sup…
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Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film Open
© 2016 American Physical Society. The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and i…
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Stacking-Dependent Electronic Structure of Trilayer Graphene Resolved by Nanospot Angle-Resolved Photoemission Spectroscopy Open
The crystallographic stacking order in multilayer graphene plays an important role in determining its electronic structure. In trilayer graphene, rhombohedral stacking (ABC) is particularly intriguing, exhibiting a flat band with an electr…
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Indirect to Direct Gap Crossover in Two-Dimensional InSe Revealed by Angle-Resolved Photoemission Spectroscopy Open
Atomically thin films of III-VI post-transition metal chalcogenides (InSe and GaSe) form an interesting class of two-dimensional semiconductors that feature a strong variation of their band gap as a function of the number of layers in the …
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Evolution of the Valley Position in Bulk Transition-Metal Chalcogenides and Their Monolayer Limit Open
Layered transition metal chalcogenides with large spin orbit coupling have recently sparked much interest due to their potential applications for electronic, optoelectronic, spintronics, and valleytronics. However, most current understandi…
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A New Magnetic Topological Quantum Material Candidate by Design Open
Magnetism, when combined with an unconventional electronic band structure, can give rise to forefront electronic properties such as the quantum anomalous Hall effect, axion electrodynamics, and Majorana fermions. Here we report the charact…
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Disentangling bulk and surface Rashba effects in ferroelectric-GeTe Open
Macroscopic ferroelectric order in alpha-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using…
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Angle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2 grain boundary Open
Material line defects are one-dimensional structures but the search and proof of electron behaviour consistent with the reduced dimension of such defects has been so far unsuccessful. Here we show using angle resolved photoemission spectro…
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Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates Open
We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident…
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Signatures of temperature driven antiferromagnetic transition in the electronic structure of topological insulator MnBi2Te4 Open
In this work, we employed angle resolved photoemission spectroscopy (ARPES) to analyze the temperature dependent changes in the electronic structure of the first antiferromagnetic topological insulator MnBi2Te4 upon crossing the Néel tempe…