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

Raúl Bombín, Tommaso Comparin, Gianluca Bertaina, Ferran Mazzanti, Stefano Giorgini, and Jordi Boronat
Phys. Rev. A 100, 023608 – Published 9 August 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 nas2 fixed by the bath density and the two-dimensional scattering length.

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  • Received 24 May 2019

DOI:https://doi.org/10.1103/PhysRevA.100.023608

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Raúl Bombín1,2,*, Tommaso Comparin2,†, Gianluca Bertaina3, Ferran Mazzanti1, Stefano Giorgini2, and Jordi Boronat1

  • 1Departament de Física, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034 Barcelona, Spain
  • 2INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
  • 3Dipartimento di Chimica and Dipartimento di Fisica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy

  • *raul.bombin@upc.edu
  • tommaso.comparin@unitn.it

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Issue

Vol. 100, Iss. 2 — August 2019

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