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

Abstract

We study effects of the oft-neglected cubic Dresselhaus spin-orbit coupling (i.e., $\propto p^3$) 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 these results, together with 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 conductance through an 8 um^2 quantum dot [D M Zumbuhl et al., Phys. Rev. B 72, 081305 (2005)] suggests that 1) the GaAs Dresselhaus coupling constant, $\gamma$, is approximately 9 eVA^3, significantly less than the commonly cited value of 27.5 eVA^3 and 2) the majority of the spin-flip component of spin-orbit coupling can come from the cubic Dresselhaus term.

4 pages plus supplementary table

References in corpus (1)

• Weak localization and conductance fluctuations in a quantum dot with parallel magnetic field and spin-orbit scattering

Cited by in corpus (8)

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• Electron spin relaxation in bulk III-V semiconductors from a fully microscopic kinetic spin Bloch equation approach
• Intersubband-induced spin-orbit interaction in quantum wells
• Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well
• Spin-orbit coupling in bulk GaAs
• Quantum Hall ferromagnetic states and spin-orbit interactions in the fractional regime
• Strain-Induced Conduction Band Spin Splitting in GaAs from First Principles Calculations
• Parametric spin excitations in lateral quantum dots