Finite-range effects in the unitary Fermi polaron

Abstract

Quantum Monte Carlo techniques are employed to study the properties of polarons in an ultracold Fermi gas, at $T=0,$ and in the unitary regime using both a zero-range model and a square-well potential. For a fixed density, the potential range is varied and results are extrapolated and compared against a zero-range model. A discussion regarding the choice of an interacting potential with a finite range is presented. We compute the polaron effective mass, the polaron binding energy, and the effective coupling between them. The latter is obtained using the Landau-Pomeranchuk's weakly interacting quasiparticle model. The contact parameter is estimated by fitting the pair distribution function of atoms in different spin states.

arXiv comment8 pages, 5 figures

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• Exact quasiparticle properties of a heavy polaron in BCS Fermi superfluids
• Fermi polarons at finite temperature: Spectral function and rf-spectroscopy
• Crossover polarons in a strongly interacting Fermi superfluid
• Intersections of ultracold atomic polarons and nuclear clusters: How is a chart of nuclides modified in dilute neutron matter?
• Multidimensional Spectroscopy of Time-Dependent Impurities in Ultracold Fermions
• Brueckner $G$-matrix approach to two-dimensional Fermi gases with the finite-range attractive interaction
• Fermi polaron in atom-ion hybrid systems
• Properties of fermionic systems with the Path-integral ground state method
• Ab initio study of the neutron and Fermi polarons on the lattice
• Impurity in a zero-temperature three-dimensional Fermi gas