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arXiv 1302.0704cond-mat.mtrl-sci
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BiTeBr中的Rashba分裂表面态

Rashba split surface states in BiTeBr

S. V. Eremeev, I. P. Rusinov, I. A. Nechaev, E. V. Chulkov

摘要:

利用密度泛函理论研究了BiTeBr的体能带结构和表面态。我们认为,在Te-Br亚晶格的原子顺序不同的有序和无序相。相对论从头计算的基础上,我们表明,有序的BiTeBr是积极优选相比,无序的。我们表明,Te和Br-终止表面的有序BiTeBr持有表面状态与一个巨大的自旋轨道分裂。Te终止的表面态自旋分裂具有Rashba型行为,耦合参数为α_R ~ 2 eV_(?)

英文摘要:

Within density functional theory, we study bulk band structure and surface states of BiTeBr. We consider both ordered and disordered phases which differ in atomic order in the Te-Br sublattice. On the basis of relativistic ab-initio calculations, we show that the ordered BiTeBr is energetically preferable as compared with the disordered one. We demonstrate that both Te- and Br-terminated surfaces of the ordered BiTeBr hold surface states with a giant spin-orbit splitting. The Te-terminated surface-state spin splitting has the Rashba-type behavior with the coupling parameter α_R ~ 2 eVÅ.

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