Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field

M. P. Nowak, B. Szafran, F. M. Peeters, B. Partoens, and W. J. Pasek
Phys. Rev. B 83, 245324 – Published 30 June 2011

Abstract

Using an exact-diagonalization approach we show that one- and two-electron InAs quantum dots exhibit an avoided crossing in the energy spectra that is induced by the spin-orbit coupling in the presence of an in-plane external magnetic field. The width of the avoided crossings depends strongly on the orientation of the magnetic field, which reveals the intrinsic anisotropy of the spin-orbit-coupling interactions. We find that for specific orientations of the magnetic field avoided crossings vanish. A value of this orientation can be used to extract the ratio of the strength of Rashba and Dresselhaus interactions. The spin-orbit anisotropy effects for various geometries and orientations of the confinement potential are discussed. Our analysis explains the physics behind the recent measurements performed on a gated self-assembled quantum dot [S. Takahashi et al., Phys. Rev. Lett. 104, 246801 (2010)].

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  • Received 7 February 2011

DOI:https://doi.org/10.1103/PhysRevB.83.245324

©2011 American Physical Society

Authors & Affiliations

M. P. Nowak1,2, B. Szafran1, F. M. Peeters2, B. Partoens2, and W. J. Pasek1

  • 1Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, PL-30-059 Kraków, Poland
  • 2Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, BE-2020 Antwerpen, Belgium

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Issue

Vol. 83, Iss. 24 — 15 June 2011

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