Onset of a Pseudogap Regime in Ultracold Fermi Gases

Abstract

We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (k_{F}a)^{-1}\approx -0.05 (a - scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which however do not contribute to the long range order.

5 pages, 4 figures + 5 pages of supplementary online material

References in corpus (18)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Scanning tunneling spectroscopy of high-temperature superconductors
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Strongly paired fermions: Cold atoms and neutron matter
• Disentangling Cooper-pair formation above Tc from the pseudogap state in the cuprates
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Measurement of the Entropy and Critical Temperature of a Strongly Interacting Fermi Gas
• Local Density Functional Theory for Superfluid Fermionic Systems: The Unitary Gas
• Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas
• Fermi-Liquid Behavior of the Normal Phase of a Strongly Interacting Gas of Cold Atoms
• Critical Temperature Curve in the BEC-BCS Crossover
• Pseudo-gap pairing in ultracold Fermi atoms
• Onset of a Pseudogap Regime in Ultracold Fermi Gases
• Thermodynamics of a Trapped Unitary Fermi Gas

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