| Issue |
EPL
Volume 93, Number 1, January 2011
|
|
|---|---|---|
| Article Number | 17007 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/93/17007 | |
| Published online | 31 January 2011 | |
Quantum signature blurred by disorder in indirect exciton gases
1
ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park - Av. del Canal Olímpic, E-08860 Castelldefels, Spain, EU
2
Laboratoire de Photonique et Nanostructures, CNRS - Route de Nozay, 91460 Marcoussis, France, EU
Received:
13
October
2010
Accepted:
20
December
2010
The photoluminescence dynamics of a microscopic gas of indirect excitons trapped in coupled quantum wells is probed at very low bath temperature (≈350 mK). Our experiments reveal the non-linear energy relaxation characteristics of indirect excitons. Particularly, we observe that the excitons dynamics is strongly correlated with the screening of structural disorder by repulsive exciton-exciton interactions. For our experiments where two-dimensional excitonic states are gradually defined, the distinctive enhancement of the exciton scattering rate towards lowest-energy states with increasing density does not reveal unambiguously quantum statistical effects such as Bose stimulation.
PACS: 78.67.De – Quantum wells
© EPLA, 2011
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