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Abstract:

We investigate the collective excitations of a single-species Bose gas at [Formula Presented] in a harmonic trap where the confinement undergoes some splitting along one spatial direction. We mostly consider one-dimensional potentials consisting of two harmonic wells separated by a distance [Formula Presented], since they essentially contain all the barrier effects that one may visualize in the three-dimensional situation. We find, within a hydrodynamic approximation, that regardless of the dimensionality of the system, pairs of levels in the excitation spectrum, corresponding to neighboring even and odd excitations, merge together as one increases the barrier height up to the current value of the chemical potential. The excitation spectra computed in the hydrodynamical or Thomas-Fermi limit are compared with the results obtained from exactly solving the time-dependent Gross-Pitaevskii equation. We also analyze the characteristics of the spatial pattern of excitations of three-dimensional boson systems according to the amount of splitting of the condensate. © 1999 The American Physical Society.

Registro:

Documento: Artículo
Título:Barrier effects on the collective excitations of split Bose-Einstein condensates
Autor:Capuzzi, P.; Hernández, E.S.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, RA-1428, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, RA-1428, Argentina
Año:1999
Volumen:59
Número:5
Página de inicio:3902
Página de fin:3908
DOI: http://dx.doi.org/10.1103/PhysRevA.59.3902
Título revista:Physical Review A - Atomic, Molecular, and Optical Physics
Título revista abreviado:Phys Rev A
ISSN:10502947
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v59_n5_p3902_Capuzzi

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Citas:

---------- APA ----------
Capuzzi, P. & Hernández, E.S. (1999) . Barrier effects on the collective excitations of split Bose-Einstein condensates. Physical Review A - Atomic, Molecular, and Optical Physics, 59(5), 3902-3908.
http://dx.doi.org/10.1103/PhysRevA.59.3902
---------- CHICAGO ----------
Capuzzi, P., Hernández, E.S. "Barrier effects on the collective excitations of split Bose-Einstein condensates" . Physical Review A - Atomic, Molecular, and Optical Physics 59, no. 5 (1999) : 3902-3908.
http://dx.doi.org/10.1103/PhysRevA.59.3902
---------- MLA ----------
Capuzzi, P., Hernández, E.S. "Barrier effects on the collective excitations of split Bose-Einstein condensates" . Physical Review A - Atomic, Molecular, and Optical Physics, vol. 59, no. 5, 1999, pp. 3902-3908.
http://dx.doi.org/10.1103/PhysRevA.59.3902
---------- VANCOUVER ----------
Capuzzi, P., Hernández, E.S. Barrier effects on the collective excitations of split Bose-Einstein condensates. Phys Rev A. 1999;59(5):3902-3908.
http://dx.doi.org/10.1103/PhysRevA.59.3902