Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.186804
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Funding
- JSPS (NEXT Program)
- JST-CREST
- MEXT of Japan (Innovative Area Topological Quantum Phenomena)
- AFOSR [AOARD 104103, 124038]
- KEK-PF [2012S2-001]
- JSPS [KAKENHI 23224010]
- Grants-in-Aid for Scientific Research [24654096, 22103004, 10J02771, 22103001, 23224010, 11J04376] Funding Source: KAKEN
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We performed systematic spin- and angle-resolved photoemission spectroscopy of TlBi(S1-xSex)(2) which undergoes a topological phase transition at x similar to 0.5. In TlBiSe2 (x = 1.0), we revealed a helical spin texture of Dirac-cone surface states with an intrinsic in-plane spin polarization of similar to 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.
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