Quasi-condensation in two-dimensional Fermi gases

Abstract

In this paper we follow the analysis and protocols of recent experiments, combined with simple theory, to arrive at a physical understanding of quasi-condensation in two dimensional Fermi gases. We find that quasi-condensation mirrors Berezinskii-Kosterlitz-Thouless behavior in many ways, including the emergence of a strong zero momentum peak in the pair momentum distribution. Importantly, the disappearance of this quasi-condensate occurs at a reasonably well defined crossover temperature. The resulting phase diagram, pair momentum distribution, and algebraic power law decay are compatible with recent experiments throughout the continuum from BEC to BCS.

References in corpus (5)

• Thermodynamics of the BCS-BEC crossover
• Observation of the Berezinskii-Kosterlitz-Thouless Phase Transition in an Ultracold Fermi Gas
• Observation of pair condensation in the quasi-2D BEC-BCS crossover
• Pairing effects in the normal phase of a two-dimensional Fermi gas
• Quasi-two-dimensional Fermi gases at finite temperature

Cited by in corpus (15)

• When Superconductivity Crosses Over: From BCS to BEC
• Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
• Quantum Geometric Contributions to the BKT Transition: Beyond Mean Field Theory
• Fermi-to-Bose crossover in a trapped quasi-2D gas of fermionic atoms
• BCS-BEC crossover of atomic Fermi superfluid in a spherical bubble trap
• Quasi-long-range order in trapped two-dimensional Bose gases
• Evolution of Cooper pairs with zero-center-of-mass momentum and their first-order correlation function in a two-dimensional ultracold Fermi gas near the observed Berezinskii-Kosterlitz-Thouless transition
• Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
• Dimensional crossover in ultracold Fermi gases from Functional Renormalisation
• Strong pairing in two dimensions: Pseudogaps, domes, and other implications
• Ground states of atomic Fermi gases in a two-dimensional optical lattice with and without population imbalance
• Two-dimensional spin-imbalanced Fermi gases at non-zero temperature: Phase separation of a non-condensate
• Two-component atomic Fermi superfluid with spin-orbital coupling in thin spherical-shell geometry
• $\mathcal{P}\mathcal{T}$-Symmetry Enhanced Berezinskii-Kosterlitz-Thouless Superfluidity
• BCS-BEC crossover in a quasi-two-dimensional Fermi superfluid