Taichi Okuda
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View article: The Electronic Structure of Palladium on Magnetoelectric Cr<sub>2</sub>O<sub>3</sub>(0001)
The Electronic Structure of Palladium on Magnetoelectric Cr<sub>2</sub>O<sub>3</sub>(0001) Open
The band structure of ultrathin Pd(111) thin films grown on the Cr 2 O 3 (0001) surface was studied by angular-resolved photoemission spectroscopy (ARPES) combined with first-principles calculations. The Cr 2 O 3 (0001) interface and the e…
View article: Hedgehog-like spin texture in Sb-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MnBi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Hedgehog-like spin texture in Sb-doped Open
We employ spin- and angle-resolved photoemission spectroscopy and circular-dichroism angle-resolved photoemission spectroscopy to systematically investigate the spin texture of Sb-doped MnBi2Te4. Our results display a hedgehog-like spin te…
View article: Hedgehog-like spin texture in Sb-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MnBi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Hedgehog-like spin texture in Sb-doped Open
We employ spin- and angle-resolved photoemission spectroscopy and circular-dichroism angle-resolved photoemission spectroscopy to systematically investigate the spin texture of Sb-doped MnBi2Te4. Our results display a hedgehog-like spin te…
View article: Spin splitting in the surface electronic structure of antiferromagnet NdBi
Spin splitting in the surface electronic structure of antiferromagnet NdBi Open
Spin splitting in electronic band structures via antiferromagnetic orders is a new route to control spin-polarized carriers that is available for spintronics applications. Here, we investigated the spin degrees of freedom in the electronic…
View article: Surface-specific thermal spin-depolarization on the half-metallic Heusler films
Surface-specific thermal spin-depolarization on the half-metallic Heusler films Open
Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (T C). Magnetic j…
View article: Spin texture tunability in Mn$_{1-x}$Ge$_x$Bi$_2$Te$_4$ through varying Ge Concentration
Spin texture tunability in Mn$_{1-x}$Ge$_x$Bi$_2$Te$_4$ through varying Ge Concentration Open
The spin-resolved dispersion dependencies for the topological insulator Mn$_{1-x}$Ge$_x$Bi$_2$Te$_4$ in the $\bar{\rm K}\barΓ\bar{\rm K}'$ path of the Brillouin zone were studied by spin- and angle-resolved photoemission spectroscopy using…
View article: Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet Open
Recent theoretical efforts predicted a type of unconventional antiferromagnet characterized by the crystal symmetry C (rotation or mirror), which connects antiferromagnetic sublattices in real space and simultaneously couples spin and mome…
View article: Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface
Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface Open
We study the interplay of lattice, spin, and orbital degrees of freedom in a two-dimensional model system: a flat square lattice of Te atoms on a Au(100) surface. The atomic structure of the Te monolayer is determined by scanning tunneling…
View article: Exploring spin-polarization in Bi-based high-Tc cuprates
Exploring spin-polarization in Bi-based high-Tc cuprates Open
The role of spin–orbit interaction has been recently reconsidered in high- $$T_{c}$$ cuprates, stimulated by the recent experimental observations of spin-polarized electronic states. However, due to the complexity of the spin texture r…
View article: Strongly Anisotropic Spin and Orbital Rashba Effect at a Tellurium - Noble Metal Interface
Strongly Anisotropic Spin and Orbital Rashba Effect at a Tellurium - Noble Metal Interface Open
We study the interplay of lattice, spin and orbital degrees of freedom in a two-dimensional model system: a flat square lattice of Te atoms on a Au(100) surface. The atomic structure of the Te monolayer is determined by scanning tunneling …
View article: Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of three-dimensional spin vector
Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of three-dimensional spin vector Open
We have developed a state-of-the-art apparatus for laser-based spin- and angle-resolved photoemission spectroscopy with micrometer spatial resolution (micro-SARPES). This equipment is achieved through the combination of a high-resolution p…
View article: Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide
Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide Open
Solids undergoing symmetry breaking phase transitions commonly exhibit domains of low symmetry phases with various sizes and morphological shapes. Usually, the shapes of these domains are not directly related to the nature of symmetry brea…
View article: Performance and simulation of the surface detector array of the TAx4 experiment
Performance and simulation of the surface detector array of the TAx4 experiment Open
The TAx4 experiment is a project to observe highest energy cosmic rays by expanding the detectionarea of the Telescope Array (TA) experiment with newly constructed surface detectors (SDs) andfluorescence detectors (FDs). New SDs are arrang…
View article: Experimental Observation and Spin Texture of Dirac Node Arcs in Tetradymite Topological Metals
Experimental Observation and Spin Texture of Dirac Node Arcs in Tetradymite Topological Metals Open
We report the observation of a nontrivial spin texture in Dirac node arcs, i.e., novel topological objects formed when Dirac cones of massless particles extend along an open one-dimensional line in momentum space. We find that such states …
View article: Adlayer influence on Dirac-type surface state at W(110)
Adlayer influence on Dirac-type surface state at W(110) Open
In a combined experimental and theoretical study, we investigated how Fe and Co adlayers on W(110) affect the Dirac-type surface state (DSS). Angle-resolved photoelectron spectroscopy data show an increase in binding energy of 75 meV and 1…
View article: Observation of spin-momentum-layer locking in centrosymmetric BiOI
Observation of spin-momentum-layer locking in centrosymmetric BiOI Open
Spin polarization effects in nonmagnetic materials are generally believed as an outcome of spin-orbit coupling provided that the global inversion symmetry is lacking, also known as 'spin-momentum locking'. The recently discovered hidden sp…
View article: Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions
Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions Open
Lateral heterojunctions of atomically precise graphene nanoribbons (GNRs) hold promise for applications in nanotechnology, yet their charge transport and most of the spectroscopic properties have not been investigated. Here, we synthesize …
View article: Observation of spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films
Observation of spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films Open
Weyl semimetals are characterized by the presence of massless band dispersion in momentum space. When a Weyl semimetal meets magnetism, large anomalous transport properties emerge as a consequence of its topological nature. We produce a vi…
View article: Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials
Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials Open
Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemissi…
View article: Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBi$_2$Te$_4$
Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBi$_2$Te$_4$ Open
Modification of the gap at the Dirac point (DP) in antiferromagnetic (AFM) axion topological insulator MnBi$_2$Te$_4$ and its electronic and spin structure has been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) und…
View article: Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure
Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure Open
The chiral crystal is characterized by a lack of mirror symmetry and inversion center, resulting in the inequivalent right- and left-handed structures. In the noncentrosymmetric crystal structure, the spin and momentum of electrons are exp…
View article: Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS
Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS Open
We have investigated the spin polarization and orbital configuration of the spin-split surface states in a nonsymmorphic semimetal HfSiS by spin- and angle-resolved photoelectron spectroscopy using polarized tunable
\nphotons combined with…
View article: Discovery of Weyl Nodal Lines in a Single-Layer Ferromagnet
Discovery of Weyl Nodal Lines in a Single-Layer Ferromagnet Open
Two-dimensional (2D) materials have attracted great attention and spurred rapid development in both fundamental research and device applications. The search for exotic physical properties, such as magnetic and topological order, in 2D mate…