Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.010401
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Funding
- ERC [279697, 290623]
- Helmholtz Alliance [HA216/EMMI]
- Heidelberg Center for Quantum Dynamics
- DIM Nano'K from Region Ile-de-France
- Landesgraduiertenforderung Baden-Wurttemberg
- [ANR-12-BS04-0022-01]
- [ANR-13-JS01-0005-01]
- European Research Council (ERC) [290623, 279697] Funding Source: European Research Council (ERC)
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We experimentally investigate the first-order correlation function of a trapped Fermi gas in the two-dimensional BEC-BCS crossover. We observe a transition to a low-temperature superfluid phase with algebraically decaying correlations. We show that the spatial coherence of the entire trapped system can be characterized by a single temperature-dependent exponent. We find the exponent at the transition to be constant over a wide range of interaction strengths across the crossover. This suggests that the phase transitions in both the bosonic regime and the strongly interacting crossover regime are of Berezinskii-Kosterlitz-Thouless type and lie within the same universality class. On the bosonic side of the crossover, our data are well described by the quantum Monte Carlo calculations for a Bose gas. In contrast, in the strongly interacting regime, we observe a superfluid phase which is significantly influenced by the fermionic nature of the constituent particles.
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