Journal
PHYSICAL REVIEW B
Volume 84, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.121401
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Funding
- Basic Energy Sciences, US Department of Energy [DE-FG02-07ER46352, DE-FG-02-05ER46200, AC03-76SF00098]
- A. P. Sloan Foundation
- Harvard Society of Fellows
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We have investigated the nature of surface states in the Bi2Te3 family of three-dimensional topological insulators using first-principles calculations as well as a model Hamiltonian approach. When the surface Dirac cone is warped due to Dresselhaus spin-orbit coupling in rhombohedral structures, the spin acquires a finite out-of-the-plane component. We provide a simple, minimal model to describe the in-plane spin texture of the warped surface Dirac cone observed in experiments where spins are seen to be not aligned perpendicular to the electron momentum. Our k . p model calculation reveals that this in-plane spin texture requires fifth-order Dresselhaus spin-orbit coupling terms.
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