Two-dimensional repulsive Fermi polarons with short- and long-range interactions

Year: 2019

Authors: Bombin R., Comparin T., Bertaina G., Mazzanti F., Giorgini S., Boronat J.

Autors Affiliation: Univ Politecn Cataluna, Dept Fis, Campus Nord B4-B5, ES-08034 Barcelona, Spain; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Univ Milan, Dipartimento Chim, Via Golgi 19, I-20133 Milan, Italy; Univ Milan, Dipartimento Fis, Via Golgi 19, I-20133 Milan, Italy.

Abstract: We study the repulsive polaron problem in a two-component two-dimensional system of fermionic atoms. We use two different interaction models: a short-range (hard-disk) potential and a dipolar potential. In our approach, all the atoms have the same mass and we consider the system to be composed of a uniform bath of a single species and a single atomic impurity. We use the diffusion Monte Carlo method to evaluate polaron properties such as its chemical potential and pair distribution functions, together with a discussion on the deficit of volume induced by the impurity. We also evaluate observables that allow us to determine the validity of the quasiparticle picture: the quasiparticle residue and the effective mass of the polaron. Employing two different potentials allows us to identify the universality regime, where the properties depend only on the gas parameter na(s)(2) fixed by the bath density and the two-dimensional scattering length.

Journal/Review: PHYSICAL REVIEW A

Volume: 100 (2)      Pages from: 23608-1  to: 23608-9

More Information: We acknowledge Richard Schmidt for providing the data from Ref. [43]. This work has been supported by the Ministerio de Economia, Industria y Competitividad (MINECO, Spain) under Grant No. FIS2017-84114-C2-1-P, FPI fellowship BES2015-074088, and by Provincia Autonoma di Trento. G.B. acknowledges D.E. Galli for access to computational resources at the Department of Physics of the University of Milan.
KeyWords: Quantum Monte-carlo; Impurities; Liquid; Gas
DOI: 10.1103/PhysRevA.100.023608

Citations: 6
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