Universal properties of dipolar Bose polarons in two dimensions

authored by: J. Sánchez-Baena, L. A.Peña Ardila, G. E. Astrakharchik, F. Mazzanti
Abstract: We study the quasiparticle properties of a dipolar impurity immersed in a two-dimensional dipolar bath. We use the ab initio diffusion Monte Carlo technique to determine the polaron energy, effective mass, and quasiparticle residue. We find that both the polaron energy and quasiparticle residue follow a universal behavior with respect to the polarization angle when properly scaled in terms of the scattering length. This trend is maintained over a wide range of values of the gas parameter, even in the highly correlated regime. Instead, the effective mass shows growing anisotropy as the tilting angle is increased, which is induced, mainly, by the anisotropy of the impurity-boson dipole-dipole interaction. Surprisingly, the effective mass is larger in the direction of minimum interparticle repulsion. Finally, we use our Monte Carlo results to check the accuracy of perturbative approaches and determine their range of validity in terms of the gas parameter.
External Organisation(s): Universitat Politècnica de Catalunya
University of Camerino
Type: Article
Journal: Physical Review A
Volume: 110
ISSN: 2469-9926
Publication date: 15.08.2024
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.110.023317 (Access: Open)

BibTeX

@article{24d6c35f99cd4f0a80a244113ec9cd6b,
title = "Universal properties of dipolar Bose polarons in two dimensions",
abstract = "We study the quasiparticle properties of a dipolar impurity immersed in a two-dimensional dipolar bath. We use the ab initio diffusion Monte Carlo technique to determine the polaron energy, effective mass, and quasiparticle residue. We find that both the polaron energy and quasiparticle residue follow a universal behavior with respect to the polarization angle when properly scaled in terms of the scattering length. This trend is maintained over a wide range of values of the gas parameter, even in the highly correlated regime. Instead, the effective mass shows growing anisotropy as the tilting angle is increased, which is induced, mainly, by the anisotropy of the impurity-boson dipole-dipole interaction. Surprisingly, the effective mass is larger in the direction of minimum interparticle repulsion. Finally, we use our Monte Carlo results to check the accuracy of perturbative approaches and determine their range of validity in terms of the gas parameter.",
author = "J. S{\'a}nchez-Baena and Ardila, {L. A.Pe{\~n}a} and Astrakharchik, {G. E.} and F. Mazzanti",
note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society.",
year = "2024",
month = aug,
day = "15",
doi = "10.1103/PhysRevA.110.023317",
language = "English",
volume = "110",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "2",
}