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Phys. Rev. B 79, 195310 (2009) [7 pages]

Signature of the microcavity exciton–polariton relaxation mechanism in the polarization of emitted light

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Georgios Roumpos1,*, Chih-Wei Lai1,2, T. C. H. Liew3, Yuri G. Rubo4,5, A. V. Kavokin4,6, and Yoshihisa Yamamoto1,2
1E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA
2National Institute of Informatics, Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
3Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore
4School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
5Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, Mexico
6Marie-Curie Chair of Excellence “Polariton Devices,” University of Rome II, 1 via della Ricerca Scientifica, Rome 00133, Italy

Received 25 June 2008; revised 15 April 2009; published 11 May 2009

We have performed real and momentum space spin-dependent spectroscopies of spontaneously formed exciton polariton condensates for a nonresonant pumping scheme. Under a linearly polarized pump, our results can be understood in terms of spin-dependent Boltzmann equations in a two-state model. This suggests that relaxation into the ground state occurs after multiple phonon-scattering events and only one polariton-polariton scattering. For the circular pumping case, in which only excitons of one spin are injected, a bottleneck effect is observed, implying inefficient relaxation.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.195310
DOI:
10.1103/PhysRevB.79.195310
PACS:
78.67.De, 03.75.Nt, 78.70.−g

*roumpos@stanford.edu

 
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