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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Datum

2012

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Physical Review B. 2012, 86(4). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.86.045122

Zusammenfassung

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.

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530 Physik

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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. 2012, 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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