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• W2046086887 endingPage "3845" @default.
• W2046086887 startingPage "3840" @default.
• W2046086887 abstract "The density of states of a Bose-condensed gas confined in a harmonic trap is investigated. The predictions of Bogoliubov theory are compared with those of Hartree-Fock theory and of the hydrodynamic model. We show that the Hartree-Fock scheme provides an excellent description of the excitation spectrum in a wide range of energy, revealing a major role played by single-particle excitations in these confined systems. The crossover from the hydrodynamic regime, holding at low energies, to the independent-particle regime is explicitly explored by studying the frequency of the surface mode as a function of their angular momentum. The applicability of the semiclassical approximation for the excited states is also discussed. We show that the semiclassical approach provides simple and accurate formulas for the density of states and the quantum depletion of the condensate." @default.
• W2046086887 created "2016-06-24" @default.
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• W2046086887 date "1997-11-01" @default.
• W2046086887 modified "2023-09-30" @default.
• W2046086887 title "Collective and single-particle excitations of a trapped Bose gas" @default.
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• W2046086887 doi "https://doi.org/10.1103/physreva.56.3840" @default.
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