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Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires

S. Kettemann
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Abstract

The spin relaxation rate $1/τ_s (W)$ in disordered quantum wires with Rashba and Dresselhaus spin-orbit coupling is derived analytically as a function of wire width $W$. It is found to be diminished when $W$ is smaller than the bulk spin-orbit length $L_{\rm SO}$. Only a small spin relaxation rate due to cubic Dresselhaus coupling $γ$ is found to remain in this limit. As a result, when reducing the wire width $W$ the quantum conductivity correction changes from weak anti- to weak localization and from negative to positive magnetoconductivity.

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S. Kettemann. 2007-03-06. Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires. https://doi.org/10.1103/physrevlett.98.176808

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