Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.186405
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Funding
- Killam
- Sloan Foundation
- CRC
- NSERC
- CFI
- CIFAR Quantum Materials
- BCSI
- NSF-MRSEC [DMR-0520471]
- DARPA-MTO [N66001-09-c-2067]
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The electronic structure of Bi2Se3 is studied by angle-resolved photoemission and density functional theory. We show that the instability of the surface electronic properties, observed even in ultrahigh-vacuum conditions, can be overcome via in situ potassium deposition. In addition to accurately setting the carrier concentration, new Rashba-like spin-polarized states are induced, with a tunable, reversible, and highly stable spin splitting. Ab initio slab calculations reveal that these Rashba states are derived from 5-quintuple-layer quantum-well states. While the K-induced potential gradient enhances the spin splitting, this may be present on pristine surfaces due to the symmetry breaking of the vacuum-solid interface.
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