Exciton spin relaxation in single semiconductor quantum dots

E. Tsitsishvili, R. v. Baltz, and H. Kalt
Phys. Rev. B 67, 205330 – Published 30 May 2003
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Abstract

We study the relaxation of the exciton spin (longitudinal relaxation time T1) in single asymmetrical quantum dots due to an interplay of the short–range exchange interaction and acoustic-phonon deformation. The calculated relaxation rates are found to depend strongly on the dot size, magnetic field, and temperature. For typical quantum dots and temperatures below 100 K, the zero-magnetic field relaxation times are long compared to the exciton lifetime, yet they are strongly reduced in high magnetic fields. We discuss explicitly quantum dots based on (In,Ga)As and (Cd,Zn)Se semiconductor compounds.

  • Received 21 January 2003

DOI:https://doi.org/10.1103/PhysRevB.67.205330

©2003 American Physical Society

Authors & Affiliations

E. Tsitsishvili* and R. v. Baltz

  • Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany

H. Kalt

  • Institut für Angewandte Physik, Universität Karlsruhe, D-76128 Karlsruhe, Germany

  • *Permanent address: Institute for Cybernetics, Academy of Science, S. Euli 5, 380086, Georgian Republic.

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Vol. 67, Iss. 20 — 15 May 2003

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