Coherence Length of Cold Exciton Gases in Coupled Quantum Wells
Sen Yang, A.T. Hammack, M.M. Fogler, L.V. Butov, and A.C. Gossard
TL;DR
This study uses a Mach-Zehnder interferometer to measure coherence lengths in cold exciton gases within coupled quantum wells, revealing enhanced coherence at low temperatures linked to exciton ordering.
Contribution
It provides the first detailed measurement of exciton coherence length in coupled quantum wells at cryogenic temperatures.
Findings
Coherence length increases significantly below a few Kelvin.
Enhanced coherence correlates with macroscopic exciton ordering.
Spectral and spatial resolution reveal coherence behavior in exciton gases.
Abstract
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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