Signatures of spin blockade in the optical response of a charged quantum dot

Kavousanaki, Eleftheria E.; Burkard, Guido

Signatures of spin blockade in the optical response of a charged quantum dot

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Date

2012

Publication type

Journal article

Published in

Physical Review B ; 86 (2012), 4. - ISSN 1098-0121. - eISSN 1550-235X

Abstract

We model spin blockade for optically excited electrons in a charged semiconductor quantum dot. We study the case in which the quantum dot is initially charged with a single electron and is then filled with an additional, optically excited electron-hole pair, thus forming a charged exciton (trion). To make contact with recent experiments, we model an optical pump-probe setup in which the two lowest quantum dot levels (s and p shells) are photoexcited. Using the Lindblad master equation, we calculate the differential transmission spectrum as a function of the pump-probe time delay. Taking into account both spin-conserving and spin-flip intraband relaxation processes, we find that the presence of the ground state electron spin leads to an optical spin blockade at short delay times which is visible as a crossover between two exponential decays of the differential transmission. To make predictions for future experiments, we also study the dependence of the spin blockade on an external magnetic field.

Subject (DDC)

530 Physics

Cite This

ISO 690

KAVOUSANAKI, Eleftheria E., Guido BURKARD, 2012. Signatures of spin blockade in the optical response of a charged quantum dot. In: Physical Review B. 86(4). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.86.045122

BibTex

@article{Kavousanaki2012Signa-22720,
  year={2012},
  doi={10.1103/PhysRevB.86.045122},
  title={Signatures of spin blockade in the optical response of a charged quantum dot},
  number={4},
  volume={86},
  issn={1098-0121},
  journal={Physical Review B},
  author={Kavousanaki, Eleftheria E. and Burkard, Guido}
}

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Bibliography of Konstanz

Yes