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First-principles theory of giant Rashba-like spin-splitting in bulk ferroelectrics

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arxiv 1802.01546 v3 pith:O7K3F4FR submitted 2018-02-05 cond-mat.mtrl-sci

First-principles theory of giant Rashba-like spin-splitting in bulk ferroelectrics

classification cond-mat.mtrl-sci
keywords bulkeffectbandsferroelectricsfirst-principleslargeorbitalrashba
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recently large Rashba-like spin splitting has been observed in certain bulk ferroelectrics. In contrast with the relativistic Rashba effect, the chiral spin texture and large spin-splitting of the electronic bands depend strongly on the character of the band and atomic spin-orbit coupling. We establish that this can be traced back to the so-called orbital Rashba effect, also in the bulk. This leads to an additional dependence on the orbital composition of the bands, which is crucial for a complete picture of the effect. Results from first-principles calculations on ferroelectic GeTe verify the key predictions of the model.

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