Two-dimensional magnetoexcitons in the presence of spin-orbit coupling

Details Two-dimensional magnetoexcitons in the presence of spin-orbit coupling Two-dimensional magnetoexcitons in the presence of spin-orbit coupling

2007-10-21

arxiv.org/abs/0710.3797v2

Phys. Rev. B 77, 125338 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.77.125338

We study theoretically the effect of spin-orbit coupling on quantum well excitons in a strong magnetic field. We show that, in the presence of an in-plane field component, the excitonic absorption spectrum develops a double-peak structure due to hybridization of bright and dark magnetoexcitons. If the Rashba and Dresselhaus spin-orbit constants are comparable, the magnitude of splitting can be tuned in a wide interval by varying the azimuthal angle of the in-plane field. We also show that the interplay between spin-orbit and Coulomb interactions leads to an anisotropy of exciton energy dispersion in the momentum plane. The results suggest a way for direct optical measurements of spin-orbit parameters.

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