Spin texture on the warped Dirac-cone surface states in topological insulators

Article

关键词: FERMI-SURFACE;    PHOTOEMISSION-SPECTROSCOPY;    PHASE;    BI2TE3;   

DOI  :  10.1103/PhysRevB.84.121401

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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