Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires
S. Kettemann
Abstract
The spin relaxation rate 1/τs (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 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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