Loss-induced collective mode in one-dimensional Bose gases

Year: 2024

Authors: Maki J., Rosso L., Mazza L., Biella A.

Autors Affiliation: CNR INO, Pitaevskii BEC Ctr, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy; Univ Paris Saclay, CNRS, LPTMS, F-91405 Orsay, France.

Abstract: We show that two-body losses induce a collective excitation in a harmonically trapped one-dimensional Bose gas, even in the absence of a quench in the trap or any other external perturbation. Focusing on the dissipatively fermionized regime, we perform an exact mode expansion of the rapidity distribution function and characterize the emergence of the collective motion. We find clear coherent oscillations in the widths of the gas both in position and rapidity space as well as in the phase-space quadrupole mode of the gas. We compare this motion to that of the well-known breathing mode in the absence of losses and find that they differ in the motion of the density profile. We also discuss the role of losses in the collective motion of the gas following various other protocols, such as the removal of losses after a finite hold time, and when the harmonic trap is also quenched.

Journal/Review: PHYSICAL REVIEW A

Volume: 110 (4)      Pages from: 43315-1  to: 43315-11

More Information: We thank S. Giorgini and S. Stringari for useful discussions. We acknowledge financial support from Provincia Autonoma di Trento, European Union-NextGeneration EU, within PRIN 2022, PNRR M4C2, Project TANQU 2022FLSPAJ [CUP B53D23005130006] . A.B. thanks the Institut Henri Poincare (UAR 839 CNRS-Sorbonne Universite) and the LabEx CARMIN (ANR-10-LABX-59-01) for their support. L.M. acknowledges funding from the ANR project LOQUST ANR-23-CE47-0006-02.
KeyWords: Phase space methods
DOI: 10.1103/PhysRevA.110.043315