Emergence of a pseudogap in the BCS-BEC crossover

Abstract

Strongly correlated Fermi systems with pairing interactions become superfluid below a critical temperature $T_c$. The extent to which such pairing correlations alter the behavior of the liquid at temperatures $T>T_c$ is a subtle issue that remains an area of debate, in particular regarding the appearance of the so-called pseudogap in the BCS-BEC crossover of unpolarized spin-$1/2$ nonrelativistic matter. To shed light on this, we extract several quantities of crucial importance at and around the unitary limit, namely: the odd-even staggering of the total energy, the spin susceptibility, the pairing correlation function, the condensate fraction, and the critical temperature $T_c$, using a non-perturbative, constrained-ensemble quantum Monte Carlo algorithm.

6 pages (including references), 4 figures; Added Journal Reference

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• Eliminating the wave function singularity for ultracold atoms by similarity transformation
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• Many-body approximations to the superfluid gap and critical temperature in pure neutron matter
• Spin Susceptibility Above the Superfluid Onset in Ultracold Fermi Gases
• Pairing patterns in polarized unitary Fermi gases above the superfluid transition
• Fourth- and fifth-order virial expansion of harmonically trapped fermions at unitarity
• Density-Induced Hadron-Quark Crossover via the Formation of Cooper Triples
• Sensitivity to the initial conditions of the Time-Dependent Density Functional Theory
• Spatial emergence of Off-Diagonal Long-Range Order throughout the BCS-BEC crossover
• On the Gravitational Wave to Matter Coupling of Superfluid Fermi Gases Near Unitarity
• Superconducting fluctuations and charge-4$e$ plaquette state at strong coupling
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