Journal
PHYSICAL REVIEW B
Volume 103, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L161107
Keywords
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Funding
- DFG [RE1469/13-1, SFB 1170, Eb 158/32, Eb 158/36]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat [EXC 2147, 390858490]
- CEDAMNF - ERDF, Ministry of Education, Youth and Sports of Czech Republic [CZ.02.1.01/0.0/0.0/15_003/0000358]
- EU ERC-AG Program [3-TOP]
- Russian Science Foundation [17-12-01047]
- ISP SB RAS
- IGM SB RAS state assignment
- Russian Science Foundation [20-12-18024] Funding Source: Russian Science Foundation
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By investigating the topological surface state in Bi-2(Te,Se)(3)(0001) using spin- and angle-resolved photoelectron spectroscopy and relativistic one-step photoemission theory, we found that Bi2Te2Se has an approximately isotropic Fermi surface while Bi2Te3 exhibits a hexagonal anisotropy, resulting in out-of-plane photoelectron spin polarization with strong dependence on light polarization, excitation energy, and crystallographic direction.
We investigate the coupled spin and orbital textures of the topological surface state in Bi-2(Te,Se)(3)(0001) across full momentum space using spin- and angle-resolved photoelectron spectroscopy and relativistic one-step photoemission theory. For an approximately isotropic Fermi surface in Bi2Te2Se, the measured intensity and spin momentum distributions, obtained with linearly polarized light, qualitatively reflect the orbital composition and the orbital-projected in-plane spin polarization, respectively. In Bi2Te3, the in-plane lattice potential induces a hexagonal anisotropy of the Fermi surface, which manifests in an out-of-plane photoelectron spin polarization with a strong dependence on light polarization, excitation energy, and crystallographic direction.
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