Hanbury Brown and Twiss bunching of phonons and of the quantum depletion in an interacting Bose gas

Cayla, H., Butera, S. , Carcy, C., Tenart, A., Hercé, G., Mancini, M., Aspect, A., Carusotto, I. and Clément, D. (2020) Hanbury Brown and Twiss bunching of phonons and of the quantum depletion in an interacting Bose gas. Physical Review Letters, 125(16), 165301. (doi: 10.1103/PhysRevLett.125.165301)

[img] Text
223970.pdf - Accepted Version

2MB

Abstract

We report the realisation of a Hanbury Brown and Twiss (HBT)-like experiment with a gas of interacting bosons at low temperatures. The low-temperature regime is reached in a three-dimensional optical lattice and atom-atom correlations are extracted from the detection of individual metastable Helium atoms after a long free-fall. We observe a HBT bunching in the non-condensed fraction of the gas whose properties strongly deviate from the HBT signals expected for non-interacting bosons. In addition, we show that the measured correlations reflect the peculiar quantum statistics of atoms belonging to the quantum depletion and of the Bogoliubov phonons, {}, of collective excitations of the many-body quantum state. Our results demonstrate that atom-atom correlations provide information about the quantum state of interacting particles, extending the interest of HBT-like experiments beyond the case of non-interacting particles.

Item Type:Articles
Additional Information:This work benefited from financial support by the LabEx PALM (Grant number ANR-10-LABX-0039), theR ́egionIle-de-FranceintheframeworkoftheDIM SIRTEQ, the “Fondation d’entreprise iXcore pour la Recherche” and the Agence Nationale pour la Recherche (Grant number ANR-17-CE30-0020-01). I. C. acknowl- edges from the European Union H2020-FETFLAG-2018- 2020 project “PhoQuS” (n.820392) and the Provincia Autonoma di Trento. S. B. acknowledges funding from the Leverhulme Trust Grant No. ECF-2019-461 and the Lord Kelvin/Adam Smith (LKAS) Leadership Fellow- ship. A. A. holds the Augustin Fresnel Chair of Insti- tut d’Optique Graduate School, supported by Nokia Bell Labs.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Butera, Dr Salvatore
Authors: Cayla, H., Butera, S., Carcy, C., Tenart, A., Hercé, G., Mancini, M., Aspect, A., Carusotto, I., and Clément, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:12 October 2020
Copyright Holders:Copyright © 2020 American Physical Society
First Published:First published in Physical Review Letters 125(16):165301
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record