Semiclassical theory of weak antilocalization and spin relaxation in ballistic quantum dots

Oleg Zaitsev, Diego Frustaglia, and Klaus Richter
Phys. Rev. B 72, 155325 – Published 25 October 2005

Abstract

We develop a semiclassical theory for spin-dependent quantum transport in ballistic quantum dots. The theory is based on the semiclassical Landauer formula, that we generalize to include spin-orbit and Zeeman interaction. Within this approach, the orbital degrees of freedom are treated semiclassically, while the spin dynamics is computed quantum mechanically. Employing this method, we calculate the quantum correction to the conductance in quantum dots with Rashba and Dresselhaus spin-orbit interaction. We find a strong sensitivity of the quantum correction to the underlying classical dynamics of the system. In particular, a suppression of weak antilocalization in integrable systems is observed. These results are attributed to the qualitatively different types of spin relaxation in integrable and chaotic quantum cavities.

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  • Received 7 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.155325

©2005 American Physical Society

Authors & Affiliations

Oleg Zaitsev1,*, Diego Frustaglia2, and Klaus Richter1

  • 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 2NEST-INFM and Scuola Normale Superiore, 56126 Pisa, Italy

  • *Electronic address: oleg.zaitsev@physik.uni-regensburg.de

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Issue

Vol. 72, Iss. 15 — 15 October 2005

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