Dimensional crossover in a strongly interacting ultracold atomic Fermi gas

Abstract

We theoretically explore the crossover from three dimensions (3D) to two (2D) in a strongly interacting atomic Fermi superfluid through confining the transverse spatial dimension. Using the gaussian pair fluctuation theory, we determine the zero-temperature equation of state and Landau critical velocity as functions of the spatial extent of the transverse dimension and interaction strength. In the presence of strong interactions, we map out a dimensional crossover diagram from the location of maximum critical velocity, which exhibits distinct dependence on the transverse dimension from 2D to quasi-2D, and to 3D. We calculate the dynamic structure factor to characterize the low-energy excitations of the system and propose that the intermediate quasi-2D regime can be experimentally probed using Bragg spectroscopy.

References in corpus (25)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Attractive and repulsive Fermi polarons in two dimensions
• Homogeneous Atomic Fermi Gases
• Radiofrequency spectroscopy of a strongly interacting two-dimensional Fermi gas
• Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
• Observation of a two-dimensional Fermi gas of atoms
• Bragg spectroscopy of a strongly interacting Fermi gas
• Equation of state of a superfluid Fermi gas in 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
• Critical velocity for superfluid flow across the BEC-BCS crossover
• Crossover from 2D to 3D in a weakly interacting Fermi gas
• Precise determination of the structure factor and contact in a unitary Fermi gas
• The critical velocity in the BEC-BCS crossover
• Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases
• Superfluidity at the BEC-BCS crossover in two-dimensional Fermi gases with population and mass imbalance
• Broad versus narrow Fano-Feshbach resonances in the BCS-BEC crossover with trapped Fermi atom
• Pairing effects in the normal phase of a two-dimensional Fermi gas
• Quantitative comparison between theoretical predictions and experimental results for Bragg spectroscopy of a strongly interacting Fermi superfluid
• Composite bosons in the 2D BCS-BEC crossover from Gaussian fluctuations
• Weakly bound states of two- and three-boson systems in the crossover from two to three dimension
• Quasi-two-dimensional Fermi gases at finite temperature
• Pressure profiles of nonuniform two-dimensional atomic Fermi gases
• Larkin-Ovchinnikov superfluidity in a two-dimensional imbalanced atomic Fermi gas

Cited by in corpus (9)

• Reduced quantum anomaly in a quasi-2D Fermi superfluid: The significance of the confinement-induced effective range of interactions
• Breathing mode frequency of a strongly interacting Fermi gas across the 2D-3D dimensional crossover
• Pairing in two-dimensional Fermi gases with a coordinate-space potential
• Density correlation functions and the spatial structure of the two-dimensional BEC-BCS crossover
• Superfluidity and pairing phenomena in ultracold atomic Fermi gases in one-dimensional optical lattices, Part I: Balanced case
• Dimensionality-induced BCS-BEC crossover in layered superconductors
• Quantum fluctuations of a resonantly interacting $p$-wave Fermi superfluid in two dimensions
• Ground states of atomic Fermi gases in a two-dimensional optical lattice with and without population imbalance
• Precision thermodynamics of the strongly interacting Fermi gas in two dimensions