Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.216401
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Funding
- Max Planck-UBC Centre for Quantum Materials
- Killam
- Alfred P. Sloan
- Alexander von Humboldt
- NSERC
- Canada Research Chairs Program
- CFI
- CIFAR Quantum Materials
- NSF-MRSEC [DMR-0520471]
- DARPA-MTO [N66001-09-c-2067]
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We study Bi2Se3 by polarization-dependent angle-resolved photoemission spectroscopy and density-functional theory slab calculations. We find that the surface state Dirac fermions are characterized by a layer-dependent entangled spin-orbital texture, which becomes apparent through quantum interference effects. This explains the discrepancy between the spin polarization obtained in spin and angle-resolved photoemission spectroscopy-ranging from 20% to 85%-and the 100% value assumed in phenomenological models. It also suggests a way to probe the intrinsic spin texture of topological insulators, and to continuously manipulate the spin polarization of photoelectrons and photocurrents all the way from 0 to +/- 100% by an appropriate choice of photon energy, linear polarization, and angle of incidence.
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