Thermal solitons as revealed by static structure factor

Abstract

We study, within a framework of the classical fields approximation, the static structure factor of a weakly interacting Bose gas at thermal equilibrium. As in a recent experiment (R. Schley et al., Phys. Rev. Lett. 111, 055301 (2013)), we find that the thermal distribution of phonons in a three-dimensional Bose gas follows the Planck distribution. On the other hand we find a disagreement between the Planck and phonon (calculated just like for the bulk gas) distributions in the case of elongated quasi-one-dimensional systems. We attribute this discrepancy to the existence of spontaneous dark solitons (i.e., thermal solitons as reported in T. Karpiuk et al., Phys. Rev. Lett. 109, 205302 (2012)) in an elongated Bose gas at thermal equilibrium.

5 pages, 4 figures

References in corpus (7)

• Non-equilibrium coherence dynamics in one-dimensional Bose gases
• Experimental Observation of a Generalized Gibbs Ensemble
• Dynamics and statistical mechanics of ultra-cold Bose gases using c-field techniques
• Extension of Bogoliubov theory to quasi-condensates
• Finite Temperature Models of Bose-Einstein Condensation
• Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons
• Single-shot simulations of dynamics of quantum dark solitons

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• Continuum of classical-field ensembles from canonical to grand canonical and the onset of their equivalence
• Mesoscopic density grains in the 1d interacting Bose gas from the exact Yang-Yang solution
• Emergence of dark soliton signatures in a one-dimensional unpolarized attractive Fermi gas on a ring
• Berezinskii-Kosterlitz-Thouless phase induced by dissipating quasisolitons
• Spin distillation cooling of ultracold Bose gases
• Mechanism for sound dissipation in a two-dimensional degenerate Fermi gas
• Drag-induced dynamical formation of dark solitons in Bose mixture on a ring