Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-09-28
M. P. Nowak and B. Szafran, Phys. Rev. B 83, 035315 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
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 $g$ factor depend on the dot orientation within (001) crystal plane. The extreme values of these quantities are obtained for [110] and [1$\bar{1}$0] 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 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.
Nowak Michael P.
Szafran B.
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