Radio frequency spectroscopy and the pairing gap in trapped Fermi gases

Abstract

We present a theoretical interpretation of radio-frequency (RF) pairing gap experiments in trapped atomic Fermi gases, over the entire range of the BCS-BEC crossover, for temperatures above and below $T_c$. Our calculated RF excitation spectra, as well as the density profiles on which they are based, are in semi-quantitative agreement with experiment. We provide a detailed analysis of the physical origin of the two different peak features seen in RF spectra, one associated with nearly free atoms at the edge of the trap, and the other with (quasi-)bound fermion pairs.

4 pages, 3 figures included, submitted to PRA(RC)

References in corpus (4)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Heat Capacity of a Strongly-Interacting Fermi Gas
• Radio-Frequency Transitions on Weakly-Bound Ultracold Molecules

Cited by in corpus (48)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Universal Properties of the Ultra-Cold Fermi Gas
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Theory of RF-spectroscopy of strongly interacting Fermions
• The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations
• Universal equation of state and pseudogap in the two-dimensional Fermi gas
• Probing the Spectral Function Using Momentum Resolved Radio Frequency Spectroscopy in Trapped Fermi Gases
• Pseudogaps in strongly interacting Fermi gases
• Spin-correlation functions in ultracold paired atomic-fermion systems: sum rules, self-consistent approximations, and mean fields
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Comparative Study of BCS-BEC Crossover Theories above $T_c$: the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
• Single Impurity In Ultracold Fermi Superfluids
• Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas
• Theory of Radio Frequency Spectroscopy Experiments in Ultracold Fermi Gases and Their Relation to Photoemission Experiments in the Cuprates
• Physics of ultracold Fermi gases revealed by spectroscopies
• Applying BCS-BEC Crossover Theory To High Temperature Superconductors and Ultracold Atomic Fermi Gases
• Thermodynamics and superfluid density in BCS-BEC crossover with and without population imbalance
• Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
• Spectroscopy of the soliton lattice formation in quasi-one-dimensional fermionic superfluids with population imbalance
• Mott-Hubbard and Anderson metal-insulator transitions in correlated lattice fermions with binary disorder
• Pseudogap phenomena in ultracold atomic Fermi gases
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• $F$-wave pairing of cold atoms in optical lattices
• Probing ultra-cold Fermi atoms with a single ion
• Strain induced superconductor-insulator transition on Lieb lattice
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Local Photoemission Spectra and Effects of Spatial Inhomogeneity in the BCS-BEC Crossover Regime of a Trapped Ultracold Fermi Gas
• Radio Frequency Spectroscopy of Trapped Fermi Gases with Population Imbalance
• Detection of Fermi Pairing via Electromagnetically Induced Transparency
• Effect of the particle-hole channel on BCS--Bose-Einstein condensation crossover in atomic Fermi gases
• Beyond linear response spectroscopy of ultracold Fermi gases
• Generic features of the spectrum of trapped polarized fermions
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Dominant Andreev Reflection through Nonlinear Radio-Frequency Transport
• Quasiparticles, coherence and nonlinearity: exact simulations of RF-spectroscopy of strongly interacting one-dimensional Fermi gases
• Pseudogap regime of a two-dimensional uniform Fermi gas
• Superfluidity in atomic Fermi gases
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
• Second-order response theory of radio-frequency spectroscopy for cold atoms
• Radio Frequency Response of the Strongly Interacting Fermi Gases at Finite Temperatures
• What can ultracold Fermi gases teach us about high $T_c$ superconductors and vice versa?
• Radio-frequency driving of an attractive Fermi gas in a one-dimensional optical lattice