Spin-dependent conductance statistics in systems with spin-orbit coupling

Abstract

Spin-dependent partial conductances are evaluated in a tight-binding description of electron transport in the presence of spin-orbit (SO) couplings, using transfer-matrix methods. As the magnitude of SO interactions increases, the separation of spin-switching channels from non-spin-switching ones is gradually erased. Spin-polarised incident beams are produced by including a Zeeman-like term in the Hamiltonian. The exiting polarisation is shown to exhibit a maximum as a function of the intensity of SO couplings. For moderate site disorder, and both weak and strong SO interactions, no evidence is found for a decay of exiting polarisation against increasing system length. With very low site disorder and weak SO couplings a spin-filter effect takes place, as polarisation {\em increases} with increasing system length.

arXiv comment7 pages, 8 figures (published version)

References in corpus (11)

• Spintronics: Fundamentals and applications
• Antiferromagnetic spintronics
• Random-Matrix Theory of Quantum Transport
• Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction
• Numerical estimation of the $\beta$-function in 2D systems with spin-orbit coupling
• Critical regime of two dimensional Ando model: relation between critical conductance and fractal dimension of electronic eigenstates
• Network Model for a 2D Disordered Electron System with Spin-Orbit Scattering
• Criticality of the metal-topological insulator transition driven by disorder
• Conductance fluctuations in the presence of spin scattering
• The probability distribution of the conductance in anisotropic systems
• Driven flow with exclusion and spin-dependent transport in graphenelike structures