Spin polarization of gapped dirac surface states near the topological phase transition in TlBi(S 1-xSe x) 2

S. Souma, M. Komatsu, M. Nomura, T. Sato, Akari Takayama, T. Takahashi, K. Eto, Kouji Segawa, Yoichi Ando

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Abstract

We performed systematic spin- and angle-resolved photoemission spectroscopy of TlBi(S 1-xSe x) 2 which undergoes a topological phase transition at x∼0.5. In TlBiSe 2 (x=1.0), we revealed a helical spin texture of Dirac-cone surface states with an intrinsic in-plane spin polarization of ∼0.8. The spin polarization still survives in the gapped surface states at x>0.5, although it gradually weakens upon approaching x=0.5 and vanishes in the nontopological phase. No evidence for the out-of-plane spin polarization was found, irrespective of x and momentum. The present results unambiguously indicate the topological origin of the gapped Dirac surface states, and also impose a constraint on models to explain the origin of mass acquisition of Dirac fermions.

Original languageEnglish
Article number186804
JournalPhysical Review Letters
Volume109
Issue number18
DOIs
Publication statusPublished - 2012 Nov 2
Externally publishedYes

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polarization
acquisition
cones
photoelectric emission
textures
fermions
momentum
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Spin polarization of gapped dirac surface states near the topological phase transition in TlBi(S 1-xSe x) 2 . / Souma, S.; Komatsu, M.; Nomura, M.; Sato, T.; Takayama, Akari; Takahashi, T.; Eto, K.; Segawa, Kouji; Ando, Yoichi.

In: Physical Review Letters, Vol. 109, No. 18, 186804, 02.11.2012.

Research output: Contribution to journalArticle

Souma, S. ; Komatsu, M. ; Nomura, M. ; Sato, T. ; Takayama, Akari ; Takahashi, T. ; Eto, K. ; Segawa, Kouji ; Ando, Yoichi. / Spin polarization of gapped dirac surface states near the topological phase transition in TlBi(S 1-xSe x) 2 In: Physical Review Letters. 2012 ; Vol. 109, No. 18.
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AU - Sato, T.

AU - Takayama, Akari

AU - Takahashi, T.

AU - Eto, K.

AU - Segawa, Kouji

AU - Ando, Yoichi

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