Bragg Spectroscopy of Cold Atomic Fermi Gases

Abstract

We propose a Bragg spectroscopy experiment to measure the onset of superfluid pairing in ultracold trapped Fermi gases. In particular, we study two component Fermi gases in the weak coupling BCS and BEC limits as well as in the strong coupling unitarity limit. The low temperature Bragg spectrum exhibits a gap directly related to the pair-breaking energy. Furthermore, the Bragg spectrum has a large maximum just below the critical temperature when the gas is superfluid in the BCS limit. In the unitarity regime, we show how the pseudogap in the normal phase leads to a significant suppression of the low frequency Bragg spectrum.

arXiv comment8 pages, 9 figures. Typos corrected. Reference updated

References in corpus (20)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Resonance superfluidity in a quantum degenerate Fermi gas
• Excitation of phonons in a Bose-Einstein condensate by light scattering
• The Excitation Spectrum of a Bose-Einstein Condensate
• The Electronic Nature of High Temperature Cuprate Superconductors
• Deviations from Fermi-liquid behavior above $T_c$ in 2D short coherence length superconductors
• Pseudogap and spectral function from superconducting fluctuations to the bosonic limit
• BCS-BEC crossover at finite temperature for superfluid trapped Fermi atoms
• Superfluid transition temperature in a trapped gas of Fermi atoms with a Feshbach resonance
• Resonance theory of the crossover from Bardeen-Cooper-Schrieffer superfluidity to Bose-Einstein condensation in a dilute Fermi gas
• An effective theory of Feshbach resonances and many-body properties of Fermi gases
• Low energy Collective Modes of a Superfluid Trapped atomic Fermi Gas
• Spin-correlation functions in ultracold paired atomic-fermion systems: sum rules, self-consistent approximations, and mean fields
• Spectroscopy of Superfluid Pairing in Atomic Fermi Gases
• Two-component Fermi gas with a resonant interaction
• Multi-channel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects
• Bragg scattering and the spin structure factor of two-component atomic gases
• Detection of BCS pairing in neutral Fermi fluids via Stokes scattering: the Hebel Slichter effect
• Density and spin response functions in ultracold fermionic atom gases
• Light scattering in Cooper-paired Fermi atoms

Cited by in corpus (29)

• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Bragg spectroscopy of a strongly interacting Fermi gas
• Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc
• Comparing and contrasting nuclei and cold atomic gases
• Shear viscosity and damping for a Fermi gas in the unitarity limit
• Breakdown of Fermi liquid description for strongly interacting fermions
• The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions
• Pseudo-gap pairing in ultracold Fermi atoms
• Superfluidity and phase transitions in a resonant Bose gas
• Pseudogaps in strongly interacting Fermi gases
• Dynamic spin response of a strongly interacting Fermi gas
• Twin peaks in rf spectra of Fermi gases at unitarity
• Physics of ultracold Fermi gases revealed by spectroscopies
• Probing spatial spin correlations of ultracold gases by quantum noise spectroscopy
• Establishing the Presence of Coherence in Atomic Fermi Superfluids: Spin-Flip and Spin-Preserving Bragg Scattering at Finite Temperatures
• Spin polarons and molecules in strongly-interacting atomic Fermi gases
• Polarons in Extremely Polarized Fermi Gases: The Strongly Interacting 6Li-40K Mixture
• Noise correlations of the ultra-cold Fermi gas in an optical lattice
• Spin transport in a unitary Fermi gas close to the BCS transition
• Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate
• Quantum vortices in optical lattices
• Bragg spectroscopy and Ramsey interferometry with an ultracold Fermi gas
• Dynamic structure factor of Fermi superfluid in the BEC-BCS crossover
• Spin-dependent Bragg spectroscopy of a spinor Bose gas
• Electronic properties and polaronic dynamics of semi-Dirac system within ladder approximation
• Response function of strongly interacting Fermi gas in a virial expansion
• Fermi condensates for dynamic imaging of electro-magnetic fields