Particle creation in the spin modes of a dynamically oscillating two-component Bose-Einstein condensate

Butera, S. and Carusotto, I. (2021) Particle creation in the spin modes of a dynamically oscillating two-component Bose-Einstein condensate. Physical Review D, 104, 083503. (doi: 10.1103/PhysRevD.104.083503)

Abstract

We investigate the parametric amplification of the zero-point fluctuations in the spin modes of a two-component Bose-Einstein condensate, triggered by the dynamical evolution of the condensate density. We first make use of a Thomas-Fermi approximation to develop a tractable theoretical model of the quantum dynamics of the Bogoliubov excitations in a harmonically trapped condensate with a time-dependent trapping frequency. The predictions of this model are then compared to an ab initio numerical study of the correlation functions of density and spin fluctuations for general spatially inhomogeneous configurations. Results are shown for the two cases of expanding and oscillating condensates: while the quantum excitation of spin modes remains weak and relatively featureless in the case of an expanding condensate, clear and experimentally promising signatures of particle creation are anticipated for the oscillating case under suitable resonance conditions between the density and the spin modes.

• Item Type: Articles
• Additional Information: S. B. acknowledges funding from the Leverhulme Trust Grant No. ECF-2019-461, and from University of Glasgow via the Lord Kelvin/Adam Smith (LKAS) Leadership Fellowship. I. C. acknowledges support from the European Union Horizon 2020 research and innovation program under Grant Agreement No. 820392 (PhoQuS).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Butera, Dr Salvatore
• Authors: Butera, S., and Carusotto, I.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 1550-7998
• ISSN (Online): 1550-2368
• Copyright Holders: Copyright © 2021 American Physical Society
• First Published: First published in Physical Review D 104:083503
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
306690		Analog models of quantum fields and their background	Stephen Barnett	Leverhulme Trust (LEVERHUL)	ECF-2019-461	P&S - Physics & Astronomy