Local observation of pair-condensation in a Fermi gas at unitarity
arXiv:1308.5487 · doi:10.1103/PhysRevLett.112.100404
Abstract
We present measurements of the local (homogeneous) density-density response function of a Fermi gas at unitarity using spatially resolved Bragg spectroscopy. By analyzing the Bragg response across one axis of the cloud we extract the response function for a uniform gas which shows a clear signature of the Bose-Einstein condensation of pairs of fermions when the local temperature drops below the superfluid transition temperature. The method we use for local measurement generalizes a scheme for obtaining the local pressure in a harmonically trapped cloud from the line density and can be adapted to provide any homogeneous parameter satisfying the local density approximation.
New version, 6 pages, 3 figures
References in corpus (13)
- Many-Body Physics with Ultracold Gases
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
- Observation of pseudogap behavior in a strongly interacting Fermi gas
- Precise characterization of ^6Li Feshbach resonances using trap-sideband resolved RF spectroscopy of weakly bound molecules
- Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
- Bragg spectroscopy of a strongly interacting Fermi gas
- Measurement of the Homogeneous Contact of a Unitary Fermi gas
- Precise determination of the structure factor and contact in a unitary Fermi gas
- Dynamic spin response of a strongly interacting Fermi gas
- Direct observation of the Fermi surface in an ultracold atomic gas
- Trapped Resonant Fermions above Superfluid Transition Temperature
- Probing Fermionic Condensates by Fast-Sweep Projection onto Feshbach Molecules
Cited by in corpus (19)
- The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
- Bose polarons near quantum criticality
- Contact and sum-rules in a near-uniform Fermi gas at unitarity
- Pseudogaps in strongly interacting Fermi gases
- Observing Properties of an Interacting Homogeneous Bose--Einstein Condensate: Heisenberg-Limited Momentum Spread, Interaction Energy and Free-Expansion Dynamics
- Strongly correlated Fermi superfluid near an orbital Feshbach resonance: Stability, equation of state and Leggett mode
- Thermometry of a deeply degenerate Fermi gas with a Bose-Einstein condensate
- Pseudogap phenomena in ultracold atomic Fermi gases
- Dynamic density and spin responses of a superfluid Fermi gas in the BCS-BEC crossover: Path integral formulation and pair fluctuation theory
- Critical behaviours of contact near phase transitions
- Collective Modes in a Two-band Superfluid of Ultracold Alkaline-earth Atoms Close to an Orbital Feshbach Resonance
- A strongly interacting Sarma superfluid near orbital Feshbach resonances
- Probing the dynamic structure factor of a neutral Fermi superfluid along the BCS-BEC crossover using atomic impurity qubits
- Correlations in the low-density Fermi gas: Fermi-Liquid state, Dimerization, and BCS Pairing
- Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
- Landau-Khalatnikov phonon damping in strongly interacting Fermi gases
- Dynamic structure factors of a strongly interacting Fermi superfluid near an orbital Feshbach resonance across the phase transition from BCS to Sarma superfluid
- Two-fluid theory for superfluid system with anisotropic effective masses
- Higgs oscillations in a unitary Fermi superfluid