Journal
PHYSICAL REVIEW RESEARCH
Volume 2, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.032013
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Funding
- Labex Matisse
- Fondation NanoSciences (Grenoble)
- OBELIX from the French Agency for Research [ANR-15-CE30-0020]
- Gordon and Betty Moore Foundation through the EPiQS initiative [GBMF4420]
- National Science Foundation MRSEC [DMR 1420541]
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We study dipolar excitons confined in a flat trap of a GaAs bilayer heterostructure. By quantifying density and density fluctuations at sub-Kelvin temperatures, we unveil the excitons' universal equation of state. This allows us to infer thermodynamically the critical phase-space density for the transition expected between normal and superfluid regimes. The region of this crossover is directly confirmed by a net change in the excitons' temporal coherence, from an exponential to an algebraic decay with an exponent compatible with the Berezinskii-Kosterlitz-Thouless theory.
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