Polarization-induced Rashba spin-orbit coupling in structurally symmetric III-Nitride quantum wells

Details Polarization-induced Rashba spin-orbit coupling in structurally symmetric III-Nitride quantum wells Polarization-induced Rashba spin-orbit coupling in structurally symmetric III-Nitride quantum wells

2006-08-07

arxiv.org/abs/cond-mat/0608179v1

Physics

Condensed Matter

Materials Science

17 pages, 8 figures

Scientific paper

10.1063/1.2397559

The effective linear coupling coefficient and the total spin-splitting are calculated in Ga- and N- face InGaN quantum wells. Alloy content, geometry, and gate voltage affect an internal field and an electron density distribution in the growth direction that has direct effect on a spin-splitting. The sign of structural inversion asymmetry (SIA) spin-orbit coupling coefficient depends on an internal electric field in the well that results in different signs for Ga-face and N-face III-Nitride structures. The effective linear coupling coefficient is always positive because of the Dresselhaus-type contribution that is a major one in quantum wells under consideration. The magnitude of the spin-splitting is comparable with that experimentally observed in III-Nitrides and III-V zinc-blende structures.

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