Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires

Details Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires

2006-05-09

arxiv.org/abs/cond-mat/0605243v4

Phys. Rev. Lett. 98, 176808 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

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 $L_{\rm SO}$. 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.

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