Abstract
We study avoided crossings opened by spin-orbit interaction in the energy spectra of one- and two-electron anisotropic quantum dots in perpendicular magnetic field. We find that for simultaneously present Rashba and Dresselhaus interactions the width of avoided crossings and the effective factor depend on the dot orientation within the (001) crystal plane. The extreme values of these quantities are obtained for [110] and [] orientations of the dot. The width of singlet-triplet avoided crossing changes between these two orientations by as much as two orders of magnitude. The discussed modulation results from the orientation-dependent strength of the Zeeman interaction, which tends to polarize the spins in the direction of the external magnetic field and thus remove the spin-orbit coupling effects.
3 More- Received 28 September 2010
DOI:https://doi.org/10.1103/PhysRevB.83.035315
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