Singlet-triplet avoided crossings and effective g factor versus spatial orientation of spin-orbit-coupled quantum dots

M. P. Nowak and B. Szafran
Phys. Rev. B 83, 035315 – Published 19 January 2011

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 g factor depend on the dot orientation within the (001) crystal plane. The extreme values of these quantities are obtained for [110] and [11¯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 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.

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  • Received 28 September 2010

DOI:https://doi.org/10.1103/PhysRevB.83.035315

© 2011 American Physical Society

Authors & Affiliations

M. P. Nowak and B. Szafran

  • Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, PL-30-059 Kraków, Poland

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Issue

Vol. 83, Iss. 3 — 1 January 2011

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