Finite-range effects in the unitary Fermi polaron

authored by
Renato Pessoa, S. A. Vitiello, L. A. Pena Ardila
Abstract

Quantum Monte Carlo techniques are employed to study the properties of polarons in an ultracold Fermi gas, at , 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.

Organisation(s)
Institute of Theoretical Physics
External Organisation(s)
Universidade Federal de Goias
Universidade Estadual de Campinas
Type
Article
Journal
Physical Review A
Volume
104
ISSN
2469-9926
Publication date
19.10.2021
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Atomic and Molecular Physics, and Optics
Electronic version(s)
https://doi.org/10.48550/arXiv.2110.13099 (Access: Open)
https://doi.org/10.1103/PhysRevA.104.043313 (Access: Closed)