2004/01/20 by C. Tozzo, Cesare Tozzo, F. Dalfovo +1 · 2 citations
Physics and Astronomy · #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Evaporation #Momentum (technical analysis) #Phonon #Physics #Quantum Electrodynamics and Casimir Effect #Quantum mechanics #Spectroscopy #Strong Light-Matter Interactions #Wavelength #cond-mat.soft
paper · pdf · doi:10.1103/physreva.69.053606
13 pages, 16 figures
arxiv created 2004/01/20 · openalex publication_date 2004/05/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Phonon like excitations can be imprinted into a trapped Bose-Einstein condensate of cold atoms using light scattering. If the condensate is suddenly let to freely expand, the initial phonons lose their collective character by transferring their energy and momentum to the motion of individual atoms. The basic mechanisms of this evaporation process are investigated by using the Gross-Pitaevskii theory and dynamically rescaled Bogoliubov equations. Different regimes of evaporation are shown to occur depending on the phonon wavelength. Distinctive signatures of the evaporated phonons are visible in the density distribution of the expanded gas, thus providing a new type of spectroscopy of Bogoliubov excitations.