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/10.1103/PhysRevA.104.043313 (Access: Closed)

BibTeX

@article{a0f82d3ee62f490db750ac8aad8c0e33,
title = "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 , 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.",
author = "Renato Pessoa and Vitiello, {S. A.} and Ardila, {L. A. Pena}",
note = "Funding Information: We thank Dr. Airton Deppman for his support of our work. Computations were performed at the Laborat{\'o}rio de Computa{\c c}{\~a}o Cient{\'i}fica - Universidade Federal de Goi{\'a}s, at facilities provided by the project INCT-FNA Proc. No. 464 898/2014-5 and at the Centro Nacional de Processamento de Alto Desempenho em S{\~a}o Paulo (CENAPAD-SP). S.A.V. acknowledges financial support from the Brazilian agency, Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo (FAPESP), project Proc. No. 2016/17612-7. L. A. P. A. acknowledges support of the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy, EXC2123QuantumFrontiers, 390837967 and FOR2247.",
year = "2021",
month = oct,
day = "19",
doi = "10.1103/PhysRevA.104.043313",
language = "English",
volume = "104",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "4",
}