Probing the Spectral Function Using Momentum Resolved Radio Frequency Spectroscopy in Trapped Fermi Gases

Abstract

We address recent momentum resolved radio frequency (RF) experiments on ultracold trapped Fermi gases of ${}^{40}$K. We show that momentum resolved RF probes provide measurements of the centrally important fermionic spectral function. They also serve to remove ambiguity plaguing the interpretation of momentum integrated RF experiments by establishing a clear dispersion signature of pairing. We find that the temperature dependence of the spectral function is dramatic at unitarity, and, importantly, smooth from above to below $T_c$ throughout BCS-BEC crossover. This should be tested experimentally, given widespread predictions of first order behavior.

5 pages, 4 figures

References in corpus (15)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Thermodynamics of the BCS-BEC crossover
• Universal thermodynamics of strongly interacting Fermi gases
• BCS-BEC crossover at finite temperature in the broken-symmetry phase
• Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Theory of RF-spectroscopy of strongly interacting Fermions
• Measuring the one-particle excitations of ultracold fermionic atoms by stimulated Raman spectroscopy
• Superfluid density and condensate fraction in the BCS-BEC crossover regime at finite temperatures
• Twin peaks in rf spectra of Fermi gases at unitarity
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Understanding the Protected Nodes and Collapse of the Fermi Arcs in Underdoped Cuprate Superconductors
• Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases

Cited by in corpus (62)

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• Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc
• Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas
• Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases
• Pseudo-gap pairing in ultracold Fermi atoms
• Onset of a Pseudogap Regime in Ultracold Fermi Gases
• Pseudogaps in strongly interacting Fermi gases
• Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas
• Spin susceptibility and fluctuation corrections in the BCS-BEC crossover regime of an ultracold Fermi gas
• Low temperature properties of the infinite-dimensional attractive Hubbard model
• A two-dimensional Fermi liquid with attractive interactions
• Comparative Study of BCS-BEC Crossover Theories above $T_c$: the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
• Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas
• Evolution of the Pseudogap in a polarized Fermi gas
• Pairing effects in the non-degenerate limit of the two-dimensional Fermi gas
• Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
• Uniform spin susceptibility and spin-gap phenomenon in the BCS-BEC crossover regime of an ultracold Fermi gas
• Mott-Hubbard and Anderson metal-insulator transitions in correlated lattice fermions with binary disorder
• Perfect Fluids and Bad Metals: Transport Analogies Between Ultracold Fermi Gases and High $T_c$ Superconductors
• Pseudogap phenomena in ultracold atomic Fermi gases
• Dynamical Cluster Quantum Monte Carlo Study of the Single Particle Spectra of Strongly Interacting Fermion Gases
• Low-dimensional pairing fluctuations and pseudogapped photoemission spectrum in a trapped two-dimensional Fermi gas
• Specific heat and effects of pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas
• Excitation properties and effects of mass imbalance in the BCS-BEC crossover regime of an ultracold Fermi gas
• Strong-coupling corrections to spin susceptibility in the BCS-BEC crossover regime of a superfluid Fermi gas
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Hetero pairing and component-dependent pseudogap phenomena in an ultracold Fermi gas with mass imbalance
• Pair condensation in a Finite Trapped Fermi Gas
• Momentum-resolved spectroscopy of a Fermi liquid
• Pseudogap phenomenon and effects of population imbalance in the normal state of a unitary Fermi gas
• Phase diagrams of Fermi gases in a trap with mass and population imbalances at finite temperature
• Pairing fluctuations and anisotropic pseudogap phenomenon in an ultracold superfluid Fermi gas with plural $p$-wave superfluid phases
• Evolution of Cooper pairs with zero-center-of-mass momentum and their first-order correlation function in a two-dimensional ultracold Fermi gas near the observed Berezinskii-Kosterlitz-Thouless transition
• Single-particle Excitations and Strong Coupling Effects in the BCS-BEC Crossover Regime of a Rare-Earth Fermi Gas with an Orbital Feshbach Resonance
• Effect of the particle-hole channel on BCS--Bose-Einstein condensation crossover in atomic Fermi gases
• Shear viscosity and Strong-Coupling Corrections in the BCS-BEC crossover Regime of an Ultracold Fermi Gas
• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules
• Momentum-resolved Raman spectroscopy of bound molecules in ultracold Fermi gas
• Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
• Strong-Coupling and Finite Temperature Effects on $p$-wave Contacts
• Momentum-resolved Raman spectroscopy of non-interacting ultracold Fermi gas
• Zero density limit extrapolation of the superfluid transition temperature in a unitary atomic Fermi gas on a lattice
• Pseudogap phenomena in a two-dimensional ultracold Fermi gas near the Berezinskii-Kosterlitz-Thouless transition
• Spectroscopic Bogoliubov features near the unitary limit
• Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
• Orbital phases of fermions in an asymmetric optical ladder
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Universal Signatures of Majorana-like Quasiparticles in Strongly Correlated Landau-Fermi Liquids
• Slow-light probe of Fermi pairing through an atom-molecule dark state
• Pseudogap phenomena near the BKT transition of a two-dimensional ultracold Fermi gas in the crossover region
• Pseudogap regime of a two-dimensional uniform Fermi gas
• Isothermal compressibility and effects of multi-body molecular interactions in a strongly interacting ultracold Fermi gas
• Superfluidity in atomic Fermi gases
• Radio Frequency Response of the Strongly Interacting Fermi Gases at Finite Temperatures
• Momentum distribution of Cooper-pairs and strong-coupling effects in a two-dimensional Fermi gas near the Berezinskii-Kosterlitz-Thouless transition
• Probing the homogeneous spectral function of a strongly interacting superfluid atomic Fermi gas in a trap using phase separation and momentum resolved rf spectroscopy
• Spin susceptibility and effects of inhomogeneous strong pairing fluctuations in a trapped ultracold Fermi gas
• Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas
• One-particle spectral function singularities in a one-dimensional gas of spin-1/2 fermions with repulsive delta-function interaction
• Spin Susceptibility and Strong Coupling Effects in an Ultracold Fermi Gas