Séminaire Fluides Quantiques: D. Gangardt


14:30 - 15:30

LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
15 Rue Georges Clemenceau, Orsay, 91405
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Quantum Grey Solitons in Confining Potentials – Trapped Lieb II mode

Dimitry Gangardt, University of Birmingham

We define and study hole-like excitations (the Lieb II mode) in a weakly interacting Bose liquid subject to external confinement. These excitations are obtained by semiclassical quantization of grey solitons propagating on top of a Thomas-Fermi background similarly to the uniform case. Radiation of phonons by an accelerated gray soliton leads to a finite lifetime of these excitations. We calculate the life-time of grey solitons and show that, for a large number of trapped atoms, most of the Lieb II levels can be experimentally resolved.

D. C. Wadkin-Snaith and D. M. Gangardt, Phys. Rev. Lett. 108, 085301 (2012)

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