Journal
PHYSICAL REVIEW B
Volume 81, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.041309
Keywords
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Funding
- JSPS [18360018, 19340078, 13674002, 2003004]
- AFOSR [AOARD-08-4099]
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Spin-polarized band structure of the three-dimensional quantum spin Hall insulator Bi1-xSbx (x=0.12-0.13) was fully elucidated by spin-polarized angle-resolved photoemission spectroscopy using a high-yield spin polarimeter equipped with a high-resolution electron spectrometer. Between the two time-reversal-invariant points, (Gamma) over bar and (M) over bar of the (111) surface Brillouin zone, a spin-up band (Sigma(1)' band) was found to cross the Fermi energy only once, providing unambiguous evidence for the strong topological insulator phase. The observed spin-polarized band dispersions determine the mirror chirality to be -1, which agrees with the theoretical prediction based on first-principles calculations.
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