Shot Noise of Spin-Decohering Transport in Spin-Orbit Coupled Nanostructures

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dc.creatorDragomirova, Ralitsa L.
dc.creatorNikolic, Branislav K.
dc.date2006-04-06
dc.date2006-11-17
dc.date.accessioned2026-07-07T07:49:15Z
dc.date.available2026-07-07T07:49:15Z
dc.descriptionWe 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 various 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 (SO) spin-orbit 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 $F_{\uparrow \to \uparrow \downarrow}$ 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 $F_{\uparrow \to \uparrow \downarrow}$.
dc.description8 pages, 3 figure; enhanced with 2 new figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0604187
dc.identifierhttp://arxiv.org/abs/cond-mat/0604187
dc.identifierPhys. Rev. B 75, 085328 (2007).
dc.identifierdoi:10.1103/PhysRevB.75.085328
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/124777
dc.subjectMesoscale and Nanoscale Physics
dc.subjectDisordered Systems and Neural Networks
dc.subjectQuantum Physics
dc.titleShot Noise of Spin-Decohering Transport in Spin-Orbit Coupled Nanostructures
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