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

verfasst von

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.

Organisationseinheit(en)

Institut für Theoretische Physik
QuantumFrontiers

Externe Organisation(en)

Universität Hamburg

Typ

Artikel

Journal

Physical Review Research

Band

3

ISSN

2643-1564

Publikationsdatum

10.05.2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Physik und Astronomie (insg.)

Elektronische Version(en)

https://doi.org/10.1103/PhysRevResearch.3.023112 (Zugang: Offen)