Criteria for 2D kinematics in an interacting Fermi gas

Abstract

Ultracold Fermi gases subject to tight transverse confinement offer a highly controllable setting to study the two-dimensional (2D) BCS to Berezinskii-Kosterlitz-Thouless superfluid crossover. Achieving the 2D regime requires confining particles to their transverse ground state which presents challenges in interacting systems. Here, we establish the conditions for an interacting Fermi gas to behave kinematically 2D. Transverse excitations are detected by measuring the transverse expansion rate which displays a sudden increase when the atom number exceeds a critical value $N_{2D}$ signifying a density driven departure from 2D kinematics. For weak interactions $N_{2D}$ is set by the aspect ratio of the trap. Close to a Feshbach resonance, however, the stronger interactions reduce $N_{2D}$ and excitations appear at lower density.

Replaced with published version, includes supplementary information

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• Many-Body Physics with Ultracold Gases
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Cited by in corpus (25)

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• Thermodynamics of an attractive 2D Fermi gas
• Quantum anomaly and 2D-3D crossover in strongly interacting Fermi gases
• High temperature pairing in a strongly interacting two-dimensional Fermi gas
• Quantum scale anomaly and spatial coherence in a 2D Fermi superfluid
• Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
• Quantum anomaly and thermodynamics of one-dimensional fermions with three-body interactions
• Fermi-to-Bose crossover in a trapped quasi-2D gas of fermionic atoms
• Superfluid density and critical velocity near the fermionic Berezinskii-Kosterlitz-Thouless transition
• Dimensional crossover of nonrelativistic bosons
• Ground state of the two-dimensional attractive Fermi gas: essential properties from few- to many-body
• Dynamics of a Fermi gas quenched to unitarity
• Virial coefficients of 1D and 2D Fermi gases by stochastic methods and a semiclassical lattice approximation
• Pressure profiles of nonuniform two-dimensional atomic Fermi gases
• Precision Many-Body Study of the Berezinskii-Kosterlitz-Thouless Transition and Temperature-Dependent Properties in the Two-Dimensional Fermi Gas
• Larkin-Ovchinnikov superfluidity in a two-dimensional imbalanced atomic Fermi gas
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Dimensional crossover in a strongly interacting ultracold atomic Fermi gas
• Breathing mode frequency of a strongly interacting Fermi gas across the 2D-3D dimensional crossover
• Microwave preparation of two-dimensional fermionic spin mixtures
• Beyond Gaussian pair fluctuation theory for strongly interacting Fermi gases
• Thermal dissipation in two dimensional relativistic Fermi gases with a relaxation time model
• Quantum anomaly and thermodynamics of one-dimensional fermions with antisymmetric two-body interactions
• Non-universal Fermi polaron in quasi two-dimensional quantum gases