Cubic Dresselhaus Spin-Orbit Coupling in 2D Electron Quantum Dots

Jacob J. Krich and Bertrand I. Halperin
Phys. Rev. Lett. 98, 226802 – Published 31 May 2007
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Abstract

We study effects of the oft-neglected cubic Dresselhaus spin-orbit coupling (i.e., p3) in GaAs/AlGaAs quantum dots. Using a semiclassical billiard model, we estimate the magnitude of the spin-orbit induced avoided crossings in a closed quantum dot in a Zeeman field. Using previous analyses based on random matrix theory, we calculate corresponding effects on the conductance through an open quantum dot. Combining our results with an experiment on an 8μm2 quantum dot [D. M. Zumbühl et al., Phys. Rev. B 72, 081305 (2005)] suggests that (1) the GaAs Dresselhaus coupling constant γ is approximately 9eVÅ3, significantly less than the commonly cited value of 27.5eVÅ3, and (2) the majority of the spin-flip effects can come from the cubic Dresselhaus term.

  • Figure
  • Received 27 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.226802

©2007 American Physical Society

Authors & Affiliations

Jacob J. Krich and Bertrand I. Halperin

  • Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA

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Issue

Vol. 98, Iss. 22 — 1 June 2007

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