Coherence Length of Cold Exciton Gases in Coupled Quantum Wells

Details Coherence Length of Cold Exciton Gases in Coupled Quantum Wells Coherence Length of Cold Exciton Gases in Coupled Quantum Wells

2006-06-27

arxiv.org/abs/cond-mat/0606683v1

Phys. Rev. Lett. 97, 187402 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.97.187402

A Mach-Zehnder interferometer with spatial and spectral resolution was used to probe spontaneous coherence in cold exciton gases, which are implemented experimentally in the ring of indirect excitons in coupled quantum wells. A strong enhancement of the exciton coherence length is observed at temperatures below a few Kelvin. The increase of the coherence length is correlated with the macroscopic spatial ordering of excitons.

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