Collective modes and superfluidity of a two-dimensional ultracold Bose gas

authored by

Vijay Pal Singh, Ludwig Mathey

Abstract

The collective modes of a quantum liquid shape and impact its properties profoundly, including its emergent phenomena such as superfluidity. Here we present how a two-dimensional Bose gas responds to a moving lattice potential. In particular, we discuss how the induced heating rate depends on the interaction strength and the temperature. This study is motivated by the recent measurements of Sobirey [arXiv:2005.07607], for which we provide a satisfying understanding. Going beyond the existing measurements, we demonstrate that this probing method allows us to identify two sound modes in quantum liquids. We show that the two sound modes undergo hybridization as a function of interaction strength, which we propose to detect experimentally. This gives insight into the two regimes of Bose gases, defined via the hierarchy of sound modes.

Organisation(s)

Institute of Theoretical Physics
QuantumFrontiers

External Organisation(s)

Universität Hamburg

Type

Article

Journal

Physical Review Research

Volume

3

ISSN

2643-1564

Publication date

10.05.2021

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

Electronic version(s)

https://doi.org/10.1103/PhysRevResearch.3.023112 (Access: Open)