Theoretical investigations of spin splittings in asymmetric AlSb/InAs/GaSb heterostructures and the possibility of electric field induced magnetization

Author: Cartoixà X.   Ting D.Z.Y.   Daniel E.S.   McGill T.C.  

Publisher: Academic Press

ISSN: 0749-6036

Source: Superlattices and Microstructures, Vol.30, Iss.6, 2001-12, pp. : 309-319

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Abstract

We use the effective bond orbital model method to examine the spin splitting due to the Rashba effect in AlSb/InAs/GaSb asymmetric heterostructures. We find for the resulting two-dimensional electron gas (2DEG) under study that large theoretical values of the Bychkov–Rashba coefficients in the range of 30 × 10 - 10to 50 × 10 - 10eV · cm can be achieved. Finally, we present a phenomenon that might lead to a direct observation of the Rashba effect. We derive an expression, valid in the diffusive limit, for the spin polarization of the current resulting from a bias parallel to the plane of the quantum well.