Abstract
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.
Original language | English (US) |
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Article number | 032013 |
Journal | Physical Review Research |
Volume | 2 |
Issue number | 3 |
DOIs | |
State | Published - Jul 2020 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy