Electronic and spin structure of the wide-band-gap topological insulator: Nearly stoichiometric Bi2Te2S

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2018 | Okuda, Taichi

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DOI Доступ к ресурсу на сайте издателя			10.1103/PhysRevB.97.205113

Title: Electronic and spin structure of the wide-band-gap topological insulator: Nearly stoichiometric Bi2Te2S
Creator: Okuda, Taichi
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Schwier, E. F.
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Iwasawa, H.
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Shimada, Kenya
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Natamane, M.
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Taniguchi, Masaki
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Rusinov, Igor P.
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Eremeev, Sergey V.
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Kokh, Konstantin A.
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Annese, E.
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Golyashov, Vladimir A.
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Tereshchenko, Oleg E.
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Chulkov, Evgueni V.
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Kimura, Akio
Date: 2018
DOI: 10.1103/PhysRevB.97.205113
Description: We have grown the phase-homogeneous ternary compound with composition Bi2Te1.85S1.15 very close to the stoichiometric Bi2Te2S. The measurements performed with spin- and angle-resolved photoelectron spectroscopy as well as density functional theory and GW calculations revealed a wide-band-gap three-dimensional topological insulator phase. The surface electronic spectrum is characterized by the topological surface state (TSS) with Dirac point located above the valence band and Fermi level lying in the band gap. TSS band dispersion and constant energy contour manifest a weak warping effect near the Fermi level along with in-plane and out-of-plane spin polarization along the ¯¯¯Γ−¯¯¯¯K line. We identified four additional states at deeper binding energies with high in-plane spin polarization.

Created: 02-12-2020

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Научное управление Electronic and spin structure of the wide-band-gap topological insulator: Nearly stoichiometric Bi2Te2S