Dynamics of coherent and incoherent spin polarizations in ensembles of quantum dots.
Phys Rev Lett
; 93(5): 057401, 2004 Jul 30.
Article
en En
| MEDLINE
| ID: mdl-15323729
ABSTRACT
The temperature dependence of spin coherence in InGaAs quantum dots is obtained from quantum beats observed in polarization-resolved pump-probe experiments. Within the same sample we clearly distinguish between coherent spin dynamics leading to quantum beats and incoherent long-lived spin-memory effects. Analysis of the coherent data using a theoretical model reveals approximately 10 times greater stability of the spin coherence at high temperature compared to that found previously for exciton states in four-wave-mixing experiments by Borri et al. [Phys. Rev. Lett. 87, 157401 (2001)]]. The data on incoherent polarization reveal a new form of spin memory based on charged quantum dots.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2004
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Article
País de afiliación:
Reino Unido