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Updated: Feb 14, 2026

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Published on: May 27, 2020
Experimental Study of the Exciton Gas-Liquid Transition in Coupled Quantum Wells
Subhradeep Misra1, Michael Stern2, Arjun Joshua1
1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Abstract:
We study the exciton gas-liquid transition in GaAs/AlGaAs coupled quantum wells. Below a critical temperature, T_{C}=4.8 K, and above a threshold laser power density the system undergoes a phase transition into a liquid state. We determine the density-temperature phase diagram over the temperature range 0.1-4.8 K. We find that the latent heat increases linearly with temperature at T≲1.1 K, similarly to a Bose-Einstein condensate transition, and becomes constant at 1.1≲T<4.8 K. Resonant Rayleigh scattering measurements reveal that the disorder in the sample is strongly suppressed and the diffusion coefficient sharply increases with decreasing temperature at T
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