Spin separation and spin Hall effect in quantum wires due to lateral-confinement-induced spin-orbit-coupling

We introduce the construction of a orthogonal wavepacket basis set, using the concept of stroboscopic time propagation, tailored to the efficient description of non-equilibrium extended electronic systems.Thanks to three desirable properties of this basis, significant insight is provided into non-equilibrium processes (both time-dependent and steady-state), and reliable physical estimates of various many-electron quantities such as density, current and spin polarization can be obtained. The use of this novel tool is demonstrated for time-dependent switching-on of the bias in quantum transport, and new results are obtained for current-induced spin accumulation at the edge of a 2D doped semiconductor caused by edge-induced spinorbit interaction. 72.10.Bg,

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“…In parallel, several other authors 20,21,22 considered the spin-orbit (SO) coupling due to nonzero gradient in potential in-plane,…”

Section: Edge-induced Spin Hall Effect It Has Been Recently Shown Thmentioning

confidence: 99%

Stroboscopic Wave-Packet Description of Nonequilibrium Many-Electron Problems

Bokes

Corsetti²,

Godby³

2008

Phys. Rev. Lett.

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“…1 Introduction The spin-orbit interaction in twodimensional zinc-blende semiconductors can generate spin currents perpendicular to a charge current even in the absence of applied magnetic fields. This phenomenon has been termed spin-Hall effect [1][2][3][4][5][6][7][8][9][10][11][12][13]. It may become a useful tool for creating spin polarized currents.…”

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confidence: 99%

Microscopic theory of spin‐filtering in non‐magnetic semiconductor nanostructures

Kubis

Vogl

2008

Phys. Status Solidi (c)

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In this paper, we investigate the intrinsic spin‐Hall effect in mesoscopic systems, i.e. spin‐orbit induced spin‐polarizations with and without external magnetic fields in confined two‐dimensional systems at low temperatures. We employ a non‐equilibrium Green's function approach that takes into account the coupling of non‐equilibrium spin occupancies and spin‐resolved electronic scattering states in open nanometer quantum systems. Importantly, our calculations go beyond the widely used continuum approximation of the spin‐orbit interaction in the envelope function approximation and are based on a microscopic relativistic tight‐binding approach that ensures the spin‐orbit effects to be properly taken into account for any degree of charge confinement and localization and to all orders in the electron wave vector. We show that the qualitative trends and results in spin polarizations, their dependency on charge density, spin‐orbit interaction strength, and confinement, as obtained within the envelope function approximation, agree with the results of atomistic calculations. The quantitative results, on the other hand, can differ significantly. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Several authors have considered such a situation in quantum wires with a parabolic confining potential [17][18][19][20] , wider strips with parabolic 21 or abrupt 22 confinement edge. These alterations in the potential landscape can be also viewed as the "impurity" which leads to nonzero spin polarization induced by the flow of the electric current.…”

Section: Introductionmentioning

confidence: 99%

Edge-induced spin polarization in two-dimensional electron gas

Bokes

Horvath

2010

Phys. Rev. B

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We characterize the role of the spin-orbit coupling between electrons and the confining potential of the edge in nonequilibrium 2D homogeneous electronic gas. We derive a simple analytical result for the magnitude of the current induced spin polarization at the edge and prove that it is independent of the details of the confinement edge potential and the electronic density within realistic values of the parameters of the considered models. While the amplitude of the spin accumulation is comparable to the experimental values of extrinsic spin Hall effect in similar samples, the spatial extent of edge induced effect is restricted to the distances of the order of Fermi wavelength (∼ 10nm).

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Spin separation and spin Hall effect in quantum wires due to lateral-confinement-induced spin-orbit-coupling

Cited by 36 publications

References 41 publications

Stroboscopic Wave-Packet Description of Nonequilibrium Many-Electron Problems

Stroboscopic Wave-Packet Description of Nonequilibrium Many-Electron Problems

Microscopic theory of spin‐filtering in non‐magnetic semiconductor nanostructures

Edge-induced spin polarization in two-dimensional electron gas

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