Hydrodynamic versus collisionless dynamics of a one-dimensional harmonically trapped Bose gas

Giulia De Rosi and Sandro Stringari
Phys. Rev. A 94, 063605 – Published 7 December 2016

Abstract

By using a sum-rule approach we investigate the transition between the hydrodynamic and the collisionless regime of the collective modes in a one-dimensional (1D) harmonically trapped Bose gas. Both the weakly interacting gas and the Tonks-Girardeau limits are considered. We predict that the excitation of the dipole compression mode is characterized in the high-temperature collisionless regime by a beating signal of two different frequencies (ωz and 3ωz), while in the high-temperature collisional regime, the excitation consists of a single frequency (7ωz). This behavior differs from the case of the lowest breathing mode whose excitation consists of a single frequency (2ωz) in both regimes. Our predictions for the dipole compression mode open promising perspectives for the experimental investigation of collisional effects in 1D configurations.

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  • Received 30 August 2016

DOI:https://doi.org/10.1103/PhysRevA.94.063605

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalFluid Dynamics

Authors & Affiliations

Giulia De Rosi* and Sandro Stringari

  • INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, Via Sommarive 14, I-38123 Povo, Italy

  • *giulia.derosi@unitn.it
  • stringar@science.unitn.it

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Issue

Vol. 94, Iss. 6 — December 2016

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