Experimental Study of the Exciton Gas-Liquid Transition in Coupled Quantum Wells

We study the exciton gas-liquid transition in GaAs/AlGaAs coupled quantum wells. Below a critical temperature, Tc=4.8K, 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 to 4.8K. We find that the latent heat increases linearly with temperature at T<1.1K, similarly to a Bose Einstein condensate transition, and becomes constant at 1.1Rayleigh scattering measurements reveal that the disorder in the sample is strongly suppressed and the diffusion coefficient sharply increases with decreasing temperature at T

Keywords:

• Critical point (thermodynamics)
• Condensed matter physics
• Atomic physics
• Quantum well
• Physics
• Exciton
• Rayleigh scattering
• Phase transition
• Bose–Einstein condensate
• Phase diagram
• Atmospheric temperature range
• Excitation

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