Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/9579
Title: Collective and single-particle excitations of a trapped Bose gas
Author: Dalfovo, Franco
Giorgini, S.
Guilleumas, Montserrat
Pitaevskii, L. P. (Lev Petrovich)
Stringari, S.
Keywords: Gas de Bose-Einstein
Estadística quàntica
Excitació nuclear
Bose-Einstein gas
Quantum statistics
Nuclear excitation
Issue Date: 1997
Publisher: The American Physical Society
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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.56.3840
It is part of: Physical Review A, 1997, vol. 56, núm. 5, p. 3840-3845.
URI: http://hdl.handle.net/2445/9579
ISSN: 1050-2947
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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