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89 papers
Unveiling quasiparticle dynamics of topological insulators through Bayesian modelling
Satoru Tokuda, Seigo Souma, Kouji Segawa +4
Quasiparticle - a key concept to describe interacting particles - characterizes electron-electron interaction in metals (Fermi liquid) and electron pairing in superconductors. Whil…
Nano-mosaic of Topological Dirac States on the Surface of Pb5Bi24Se41 Observed by Nano-ARPES
Kosuke Nakayama, Seigo Souma, Chi Xuan Trang +9
We have performed scanning angle-resolved photoemission spectroscopy with a nanometer-sized beam spot (nano-ARPES) on the cleaved surface of Pb5Bi24Se41, which is a member of the (…
Metal-insulator transition and tunable Dirac-cone surface state in the topological insulator TlBi1-xSbxTe2 studied by angle-resolved photoemission
Chi Xuan Trang, Zhiwei Wang, Keiko Yamada +5
We report a systematic angle-resolved photoemission spectroscopy on topological insulator (TI) TlBi1-xSbxTe2 which is bulk insulating at 0.5 < x < 0.9 and undergoes a metal-insulat…
Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey
Daichi Takane, Seigo Souma, Takafumi Sato +3
Recent discovery of bulk insulating topological insulator (TI) Bi2-xSbxTe3-ySey paved a pathway toward practical device application of TIs. For realizing TI-based devices, it is ne…
Switching of Charge-Current-Induced Spin Polarization in the Topological Insulator BiSbTeSe2
Fan Yang, Subhamoy Ghatak, A. A. Taskin +7
The charge-current-induced spin polarization is a key property of topological insulators for their applications in spintronics. However, topological surface states are expected to…
Universal scaling for the spin-electricity conversion on surface states of topological insulators
K. T. Yamamoto, Y. Shiomi, Kouji Segawa +2
We have investigated spin-electricity conversion on surface states of bulk-insulating topological insulator (TI) materials using a spin pumping technique. The sample structure is N…