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View article: Direct Observation of the Surface Superconducting Gap in the Topological Superconductor Candidate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>β</mml:mi> <mml:mtext>−</mml:mtext> <mml:msub> <mml:mrow> <mml:mi>PdBi</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math>
Direct Observation of the Surface Superconducting Gap in the Topological Superconductor Candidate Open
β-PdBi_{2} is one of the candidates for topological superconductors with a superconducting (SC) transition temperature (T_{c}) of 5.3 K, in which parity mixing of a spin singlet and spin triplet has been anticipated, being crucial for the …
View article: Unveiling van Hove singularity modulation and fluctuated charge order in kagome superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Cs</mml:mi><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:msub><mml:mi mathvariant="normal">b</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math> via time-resolved ARPES
Unveiling van Hove singularity modulation and fluctuated charge order in kagome superconductor via time-resolved ARPES Open
Kagome superconductor CsV3Sb5, which exhibits intertwined unconventional charge-density wave (CDW) and superconductivity, has garnered significant attention recently. Despite extensive static studies, the nature of these exotic electronic …
View article: Uniform Diffusion of Cooper Pairing Mediated by Hole Carriers in Topological Sb <sub>2</sub> Te <sub>3</sub> /Nb
Uniform Diffusion of Cooper Pairing Mediated by Hole Carriers in Topological Sb <sub>2</sub> Te <sub>3</sub> /Nb Open
Spin-helical Dirac Fermions at a doped topological insulator's boundaries can support Majorana quasiparticles when coupled with s-wave superconductors, but in n-doped systems, the requisite induced Cooper pairing in topological states is o…
View article: High throughput observation of latent images on resist using laser-based photoemission electron microscopy
High throughput observation of latent images on resist using laser-based photoemission electron microscopy Open
The rapid evolution of lithography technology necessitates faster pattern inspection methods. Here, we propose the use of laser-based photoemission electron microscopy (laser-PEEM) for high-throughput observation of latent images on an ele…
View article: Spin-polarized saddle points in the topological surface states of elemental bismuth revealed by pump-probe spin- and angle-resolved photoemission spectroscopy
Spin-polarized saddle points in the topological surface states of elemental bismuth revealed by pump-probe spin- and angle-resolved photoemission spectroscopy Open
We use pump-probe, spin- and angle-resolved photoemission spectroscopy (ARPES) with a 10.7 eV laser accessible up to the Brillouin zone edge, and reveal the entire band structure around the Fermi level, including the unoccupied side, for t…
View article: Coherence Length of Electronic Nematicity in Iron-Based Superconductors
Coherence Length of Electronic Nematicity in Iron-Based Superconductors Open
Recent developments in laser-excited photoemission electron microscopy (laser-PEEM) advance the visualization of electronic nematicity and nematic domain structures in iron-based superconductors. In FeSe and BaFe$_2$(As$_{0.87}$P$_{0.13}$)…
View article: Dielectric breakdown behavior of ferroelectric HfO<sub>2</sub> capacitors by constant voltage stress studied by in situ laser-based photoemission electron microscopy
Dielectric breakdown behavior of ferroelectric HfO<sub>2</sub> capacitors by constant voltage stress studied by in situ laser-based photoemission electron microscopy Open
In situ laser-based photoemission electron microscopy observations with time-dependent dielectric breakdown measurements of TiN/Hf 0.5 Zr 0.5 O 2 (HZO)/TiN ferroelectric capacitors were performed to reveal the dielectric breakdown (DB) mec…
View article: Nondestructive imaging of breakdown process in ferroelectric capacitors using <i>in situ</i> laser-based photoemission electron microscopy
Nondestructive imaging of breakdown process in ferroelectric capacitors using <i>in situ</i> laser-based photoemission electron microscopy Open
HfO2-based ferroelectrics are one of the most actively developed functional materials for memory devices. However, in HfO2-based ferroelectric devices, dielectric breakdown is a main failure mechanism during repeated polarization switching…
View article: Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal
Revealing the Hidden Spin-Polarized Bands in a Superconducting Tl Bilayer Crystal Open
The interplay of spin-orbit coupling and crystal symmetry can generate spin-polarized bands in materials only a few atomic layers thick, potentially leading to unprecedented physical properties. In the case of bilayer materials with global…
View article: Spontaneous breaking of mirror symmetry beyond critical doping in Pb-Bi2212
Spontaneous breaking of mirror symmetry beyond critical doping in Pb-Bi2212 Open
Identifying ordered phases and their underlying symmetries is the first and most important step toward understanding the mechanism of high-temperature superconductivity; critical behaviors of ordered phases are expected to be correlated wi…
View article: Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES
Spin-polarized saddle points in the topological surface states of the elemental Bismuth revealed by a pump-probe spin-resolved ARPES Open
We use a pump-probe, spin-, and angle-resolved photoemission spectroscopy (ARPES) with a 10.7 eV laser accessible up to the Brillouin zone edge, and reveal for the first time the entire band structure, including the unoccupied side, for th…
View article: Nodeless electron pairing in CsV$_3$Sb$_5$-derived kagome superconductors
Nodeless electron pairing in CsV$_3$Sb$_5$-derived kagome superconductors Open
The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order, and lattice geometry. Despite extensive research efforts on this system, the nature of the …
View article: Coexistence of Bulk-Nodal and Surface-Nodeless Cooper Pairings in a Superconducting Dirac Semimetal
Coexistence of Bulk-Nodal and Surface-Nodeless Cooper Pairings in a Superconducting Dirac Semimetal Open
The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to explore the full details of the superconducting pairing. H…
View article: Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1)
Quasi One-Dimensional Band Structure of Photoinduced Semimetal Phase of Ta<sub>2</sub>Ni<sub>1−</sub><i><sub>x</sub></i>Co<i><sub>x</sub></i>Se<sub>5</sub> (<i>x</i> = 0.0 and 0.1) Open
The photoinduced semimetal phase of Ta2Ni1−xCoxSe5 (x = 0.0 and 0.1) is studied by time-resolved angle-resolved photoemission spectroscopy. The observed band dispersions roughly agree with the generalized gradient approximation (GGA) calcu…
View article: Dynamical swinging between the insulating and metallic phases induced by the coherent amplitude mode excitation in 1T-TaS2
Dynamical swinging between the insulating and metallic phases induced by the coherent amplitude mode excitation in 1T-TaS2 Open
We investigate the nonequilibrium electronic structure of 1 T -TaS 2 by time- and angle-resolved photoemission spectroscopy. We observe that strong photo excitation induces the collapse of the Mott gap, leading to the photo-induced metalli…
View article: Topological Surface State of Bi<sub>2</sub>Se<sub>3</sub> Modified by Physisorption of <i>n</i>‐Alkane
Topological Surface State of Bi<sub>2</sub>Se<sub>3</sub> Modified by Physisorption of <i>n</i>‐Alkane Open
Recently, the interface between an organic molecular layer and a topological insulator (TI) surface (Org./TI interface) has been studied to explore the possibility of multifunctional TI devices with organic molecules. Nevertheless, underst…
View article: Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal
Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal Open
The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to explore the full details of the superconducting pairing. H…
View article: Photo-induced nonlinear band shift and valence transition in SmS
Photo-induced nonlinear band shift and valence transition in SmS Open
The photo-induced band structure variation of a rare-earth-based semiconductor, samarium monosulfide (SmS), was investigated using high-harmonic-generation laser-based time-resolved photoelectron spectroscopy. A nonlinear photo-induced ban…
View article: Direct Observation of the Topological Surface State in the Topological Superconductor 2M-WS<sub>2</sub>
Direct Observation of the Topological Surface State in the Topological Superconductor 2M-WS<sub>2</sub> Open
The quantum spin Hall (QSH) effect has attracted extensive research interest because of the potential applications in spintronics and quantum computing, which is attributable to two conducting edge channels with opposite spin polarization …
View article: Discovery of nematic Bogoliubov Fermi surface in an iron-chalcogenide superconductor
Discovery of nematic Bogoliubov Fermi surface in an iron-chalcogenide superconductor Open
Bogoliubov Fermi surface (BFS) is an unprecedented superconducting gap structure in which the nodal (zero-gap) region forms a two-dimensional surface rather than a line or point. Tetragonal Fe(Se,S) having a large residual density of state…
View article: Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal CsV3Sb5
Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal CsV3Sb5 Open
In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly i…
View article: Nodeless electron pairing in CsV3Sb5-derived kagome superconductors
Nodeless electron pairing in CsV3Sb5-derived kagome superconductors Open
The newly discovered kagome superconductors represent a promising platform for investigating the quantum interplay between band topology, electronic order, and lattice geometry. Despite extensive research efforts on this system, the nature…
View article: Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal $\rm{CsV_3Sb_5}$
Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal $\rm{CsV_3Sb_5}$ Open
In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal $\rm{CsV_3Sb_5}$, superconductivity that p…
View article: Fluctuating spin-orbital texture of Rashba-split surface states in real and reciprocal space
Fluctuating spin-orbital texture of Rashba-split surface states in real and reciprocal space Open
Spin-orbit interaction (SOI) in low-dimensional systems, namely Rashba systems and the edge states of topological materials, is extensively studied in this decade as a promising source to realize various fascinating spintronic phenomena, s…
View article: Photo-Excitation Band-Structure Engineering of 2<i>H</i>-NbSe<sub>2</sub> Probed by Time- and Angle-Resolved Photoemission Spectroscopy
Photo-Excitation Band-Structure Engineering of 2<i>H</i>-NbSe<sub>2</sub> Probed by Time- and Angle-Resolved Photoemission Spectroscopy Open
We investigated the nonequilibrium electronic structure of 2H-NbSe$_2$ by time- and angle-resolved photoemission spectroscopy. We find that the band structure is distinctively modulated by strong photo-excitation, as indicated by the unusu…
View article: Visualization of optical polarization transfer to photoelectron spin vector emitted from a spin-orbit coupled surface state
Visualization of optical polarization transfer to photoelectron spin vector emitted from a spin-orbit coupled surface state Open
Similar to light polarization that is selected by a superposition of optical\nbasis, electron spin direction can be controlled through a superposition of\nspin basis. We investigate such a spin interference occurring in photoemission\nof t…