Spin-orbit coupling and the topology of gases of spin-degenerate cold excitons in photoexcited GaAs-AlGaAs quantum wells

M. Matuszewski, T. C. H. Liew, Y. G. Rubo, and A. V. Kavokin
Phys. Rev. B 86, 115321 – Published 13 September 2012

Abstract

We calculate the spatial structure of four-component spinor systems of mixed bright and dark exciton condensates in coupled quantum wells. The spin-dependent bright-dark exciton conversion and Dresselhaus spin-orbit coupling is found to generate a rich variety of topological elements. By propagating the Gross-Pitaevskii equation in imaginary time, we observe the following: single and multiple polarized vortices; the phase separation of bright and dark excitons; and exotic spatial structures in density and spin polarization.

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  • Received 5 April 2012

DOI:https://doi.org/10.1103/PhysRevB.86.115321

©2012 American Physical Society

Authors & Affiliations

M. Matuszewski1, T. C. H. Liew2,3, Y. G. Rubo2, and A. V. Kavokin4,5

  • 1Instytut Fizyki Polskiej Akademii Nauk, Aleja Lotników 32/46, PL-02-668 Warsaw, Poland
  • 2Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos, 62580, Mexico
  • 3Mediterranean Institute of Fundamental Physics, 31, via Appia Nuova, 00040, Rome, Italy
  • 4School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
  • 5Spin Optics Laboratory, St-Petersburg State University, 1, Ulianovskaya, St-Petersburg, Russia

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Issue

Vol. 86, Iss. 11 — 15 September 2012

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