391 citations · 958 across the 29 of their papers we have counts for
12 papers · 1 filter
Growth of 2D topological material Bi on InSb(111)B with fractal surface structures
Yoshiyuki Ohtsubo, Takuto Nakamura, Shin-ichi Kimura
Bismuth (Bi) atomic layers are known as 2D topological materials with variety of the electronic structures and topological orders depending on the number of stacking layers. Recent…
Fluctuated spin-orbital texture of Rashba-split surface states in real and reciprocal space
Takuto Nakamura, Yoshiyuki Ohtsubo, Ayumi Harasawa +4
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 so…
One-dimensionality of the spin-polarized surface conduction and valence bands of quasi-one-dimensional Bi chains on GaSb(110)-(21)
Yoshiyuki Ohtsubo, Naoki Tokumasu, Hiroshi Watanabe +8
Surface electronic structure and its one-dimensionality above and below the Fermi level () were surveyed on the Bi/GaSb(110)-(21) surface hosting quasi-one-dimen…
Temperature-driven modification of surface electronic structure on bismuth, a topological border material
Y. Ohtsubo, Y. Yamashita, J. Kishi +7
Single crystalline bismuth (Bi) is known to have a peculiar electronic structure which is very close to the topological phase transition. The modification of the surface states of…
Giant Rashba splitting of quasi-1D surface states on Bi/InAs(110)-(21)
T. Nakamura, Y. Ohtsubo, Y. Yamashita +10
Electronic states on the Bi/InAs(110)-(21) surface and its spin-polarized structure are revealed by angle-resolved photoelectron spectroscopy (ARPES), spin-resolved ARPES,…
Direct observation of electron thermalization and electron-phonon coupling in photoexcited bismuth
J. Faure, J. Mauchain, E. Papalazarou +7
We investigate the ultrafast response of the bismuth (111) surface by means of time resolved photoemission spectroscopy. The direct visualization of the electronic structure allows…
Spin-polarized quasi 1D state with finite bandgap on the Bi/InSb(001) surface
J. Kishi, Y. Ohtsubo, T. Nakamura +13
One-dimensional (1D) electronic states were discovered on 1D surface atomic structure of Bi fabricated on semiconductor InSb(001) substrates by angle-resolved photoelectron spectro…
Topological surface states on Bi(111) based on empirical tight-binding calculations
Yoshiyuki Ohtsubo, Shin-ichi Kimura
The topological order of single-crystal Bi and its surface states on the (111) surface are studied in detail based on empirical tight-binding (TB) calculations. New TB parameters a…
Hierarchical spin-orbital polarisation of a giant Rashba system
L. Bawden, J. M. Riley, C. H. Kim +15
The Rashba effect is one of the most striking manifestations of spin-orbit coupling in solids, and provides a cornerstone for the burgeoning field of semiconductor spintronics. It…
Surface Tomonaga-Luttinger liquid state on Bi/InSb(001)
Yoshiyuki Ohtsubo, Jun-ichiro Kishi, Kenta Hagiwara +8
A 1D metallic surface state was created on an anisotropic InSb(001) surface covered with Bi. Angle-resolved photoelectron spectroscopy (ARPES) showed a 1D Fermi contour with almost…
Non-trivial Surface-band Dispersion on Bi(111)
Yoshiyuki Ohtsubo, Luca Perfetti, Mark Oliver Goerbig +3
We performed angle-resolved photoelectron spectroscopy of the Bi(111) surface to demonstrate that this surface support edge states of non-trivial topology. Along the …
Giant Anisotropy of Spin-Orbit Splitting at the Bismuth Surface
Y. Ohtsubo, J. Mauchain, J. Faure +6
We investigate the bismuth (111) surface by means of time and angle resolved photoelectron spectroscopy. The parallel detection of the surface states below and above the Fermi leve…