Orbital-dependent Rashba coupling in bulk BiTeCl and BiTeI

Zhiyong Zhu, Yingchun Cheng, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

By all-electron ab initio calculations, the layered polar semiconductor BiTeCl is shown to host giant bulk Rashba spin splitting, similar to the recently reported compound BiTeI. In both materials, the standard Rashba–Bychkov model is no longer applicable, because of huge band extrema shifts even in the absence of spin–orbit coupling and a strong momentum dependence of the Rashba coupling constant (αR). By assuming αR to be orbital dependent, a phenomenological extension of the Rashba–Bychkov model is proposed which explains the splitting behavior of states with small in-plane momentum.
Original languageEnglish (US)
Pages (from-to)023010
JournalNew Journal of Physics
Volume15
Issue number2
DOIs
StatePublished - Feb 6 2013

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