Shot noise of spin-polarized charge currents as a probe of spin coherence in spin-orbit coupled nanostructures

Ralitsa L. Dragomirova; Branislav K. Nikolic

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Shot noise of spin-polarized charge currents as a probe of spin coherence in spin-orbit coupled nanostructures

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We generalize the scattering theory of quantum shot noise to include the full spin-density matrix of electrons injected from a spin filtering or ferromagnetic electrode into a quantum-coherent nanostructure governed by arbitrary spin-dependent interactions. This formalism yields the spin-resolved shot noise power for different experimental measurement setups-with ferromagnetic source and ferromagnetic or normal drain electrodes-whose evaluation for the diffusive multichannel quantum wires with the Rashba spin-orbit (SO) coupling shows how spin decoherence and dephasing lead to substantial enhancement of charge current fluctuations (characterized by Fano factors > 1/3). However, these processes and the corresponding shot-noise increase are suppressed in narrow wires, so that charge transport experiments measuring the Fano factor F_(↑→↑ ↓) in a ferromagnet/SO-coupled-wire/paramagnet setup also quantify the degree of phase coherence of transported spin-we predict a one-to-one correspondence between the magnitude of the spin-polarization vector and F_(↑→↑ ↓).

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《Physical review, B. Condensed matter and materials physics》 |2007年第8期|085328.1-085328.8|共9页
作者
Ralitsa L. Dragomirova; Branislav K. Nikolic;
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作者单位

Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2570, USA;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
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electronic transport in mesoscopic systems; noise processes and phenomena; spin polarized transport; spin-orbit coupling; zeeman and stark splitting; jahn-teller effect;

Shot noise of spin-polarized charge currents as a probe of spin coherence in spin-orbit coupled nanostructures

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