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APS » Journals » Phys. Rev. B » Volume 67 » Issue 12
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Phys. Rev. B 67, 121302(R) (2003) [4 pages]

Preservation of quantum coherence after exciton-exciton interaction in quantum wells

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N. Garro1,2, S. P. Kennedy1, R. T. Phillips1, G. Aichmayr3,*, U. Rössler3,†, and L. Viña3
1Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom
2Institut de Ciència dels Materials, Universitat de València, E-46071 València, Spain
3Departamento Física de Materiales, Universidad Autónoma Madrid, E-28049 Madrid, Spain

Received 14 October 2002; revised 9 January 2003; published 17 March 2003

The dynamics of exciton-exciton interaction in quantum wells has been investigated by monitoring the time-resolved resonant secondary emission that follows excitation with linearly and circularly polarized light. Preservation of quantum beating in the cross-polarized emission demonstrates that spin relaxation can take place, for some scattering channels, without total quantum coherence loss. Interexciton electron exchange is the scattering mechanism that explains the persistence of the beating and, since it is sensitive to the fine structure of excitons, the shift by π in the phase of the beating observed in the experiment.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.121302
DOI:
10.1103/PhysRevB.67.121302
PACS:
78.47.+p, 71.70.Gm, 78.66.Fd

*Present address: Infineon Technologies, Koenigsbruecker Street 180, D-01099, Dresden, Germany.

†Permanent address: Institut für Theoretische Physik, Universität at Regensburg, D-92040 Regensburg, Germany.

 
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