Theoretical aspects of the Edelstein effect for anisotropic two-dimensional 
electron gas and topological insulators

Johansson, Annika; Henk, Jürgen; Mertig, Ingrid

doi:10.1103/PhysRevB.93.195440

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Theoretical aspects of the Edelstein effect for anisotropic two-dimensional electron gas and topological insulators

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Johansson, Annika
Max Planck Institute of Microstructure Physics, Max Planck Society;

Henk, Jürgen
Max Planck Institute of Microstructure Physics, Max Planck Society and Cooperation Partners;

Mertig, Ingrid
Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.93.195440
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Citation

Johansson, A., Henk, J., & Mertig, I. (2016). Theoretical aspects of the Edelstein effect for anisotropic two-dimensional electron gas and topological insulators. Physical Review B, 93(19): 195440. doi:10.1103/PhysRevB.93.195440.

Cite as: https://hdl.handle.net/21.11116/0000-000F-CFE6-5

Abstract

A charge current driven through a two-dimensional electron gas (2DEG) with Rashba spin-orbit coupling generates a spatially homogeneous spin polarization perpendicular to the applied electric field. This phenomenon is the Aronov–Lyanda-Geller–Edelstein (ALGE) effect. For selected model systems, we consider the ALGE effect within the semiclassical Boltzmann transport theory. Its energy dependence is investigated, in particular the regime below the Dirac point of the 2DEG. In addition to an isotropic 2DEG, we analyze systems with anisotropic Fermi contours. We predict that the current-induced spin polarization vanishes if the Fermi contour passes through a Lifshitz transition. Further, we corroborate that topological insulators (TI) provide a very efficient charge-to-spin conversion.