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

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

2007-02-28

arxiv.org/abs/cond-mat/0702667v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages plus supplementary table

Scientific paper

10.1103/PhysRevLett.98.226802

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.

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