Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires

Abstract

The spin relaxation rate $1/{\tau }_s(W)$ 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 $L_{\mathrm{SO}}$. Only a small spin relaxation rate due to cubic Dresselhaus coupling $\gamma$ 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.

4.0 pages, 3 figures, final version, Refs. updated, introduction and formula for spin relaxation rate added

References in corpus (1)

• Suppression of Spin Relaxation in Submicron InGaAs Wires

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