Finite Temperature Momentum Distribution of a Trapped Fermi Gas

Abstract

We present measurements of the temperature-dependent momentum distribution of a trapped Fermi gas consisting of ${}^{40}$K in the BCS-BEC crossover regime. Accompanying theoretical results based upon a simple mean-field ground state are compared to the experimental data. Non-monotonic effects associated with temperature, $T$, arise from the competition between thermal broadening and a narrowing of the distribution induced by the decrease in the excitation gap $\Delta (T)$ with increasing $T$.

5 pages, 3 figures

References in corpus (3)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover

Cited by in corpus (15)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Bragg spectroscopy of a strongly interacting Fermi gas
• Number of closed-channel molecules in the BEC-BCS crossover
• The potential energy of a ${}^{40}$K Fermi gas in the BCS-BEC crossover
• Is a gas of strongly interacting atomic fermions a nearly perfect fluid?
• Thermodynamics and superfluid density in BCS-BEC crossover with and without population imbalance
• Pseudogap phenomena in ultracold atomic Fermi gases
• Asymmetric Fermi superfluid with different atomic species in a harmonic trap
• Probing ultra-cold Fermi atoms with a single ion
• Exact coherent states of a noninteracting Fermi gas in a harmonic trap
• Density functional theory of the trapped Fermi gas in the unitary regime
• Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
• Energy fluctuation and discontinuity of specific heat
• Paired phases and Bose-Einstein condensation of spin-one bosons with attractive interaction