Quantum Signature Blurred by Disorder in Indirect Exciton Gases

Details Quantum Signature Blurred by Disorder in Indirect Exciton Gases Quantum Signature Blurred by Disorder in Indirect Exciton Gases

2011-01-05

arxiv.org/abs/1101.1023v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The photoluminescence dynamics of a microscopic gas of indirect excitons trapped in coupled quantum wells is probed at very low bath temperature (approximately 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.

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