Strong-coupling Bose polarons in one dimension: Condensate deformation and modified Bogoliubov phonons

Jager J, Barnett R, Will M, Fleischhauer M (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Physical Review Research American Physical Society

Book Volume: 2

Article Number: 033142

Journal Issue: 3

DOI: 10.1103/PhysRevResearch.2.033142

Abstract

We discuss the interaction of a quantum impurity with a one-dimensional degenerate Bose gas forming a Bose polaron. In three spatial dimension, the quasiparticle is typically well described by the extended Fröhlich model, in full analogy with the solid-state counterpart. This description, which assumes an undepleted condensate, fails, however, in 1D, where the backaction of the impurity on the condensate leads to a self-bound mean-field polaron for arbitrarily weak impurity-boson interactions. We present a model that takes into account this backaction and describes the impurity-condensate interaction as coupling to phononlike excitations of a deformed condensate. A comparison of polaron energies and masses to diffusion quantum Monte Carlo simulations shows very good agreement already on the level of analytical mean-field solutions and is further improved when taking into account quantum fluctuations.

Involved external institutions

Imperial College London / The Imperial College of Science, Technology and Medicine GB United Kingdom (GB) Technische Universität Kaiserslautern DE Germany (DE)

How to cite

APA:

Jager, J., Barnett, R., Will, M., & Fleischhauer, M. (2020). Strong-coupling Bose polarons in one dimension: Condensate deformation and modified Bogoliubov phonons. Physical Review Research, 2(3). https://dx.doi.org/10.1103/PhysRevResearch.2.033142

MLA:

Jager, J., et al. "Strong-coupling Bose polarons in one dimension: Condensate deformation and modified Bogoliubov phonons." Physical Review Research 2.3 (2020).

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