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 na2s fixed by the bath density and the two-dimensional scattering length.

Two-dimensional repulsive Fermi polarons with short- and long-range interactions / Bombín, Raúl; Comparin, Tommaso; Bertaina, Gianluca; Mazzanti, Ferran; Giorgini, Stefano; Boronat, Jordi. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 100:2(2019), p. 023608. [10.1103/PhysRevA.100.023608]

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

Bertaina, Gianluca;
2019

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 na2s fixed by the bath density and the two-dimensional scattering length.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/60905
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