Barrier effects on the collective excitations of split Bose-Einstein condensates

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...

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Autores principales: Capuzzi, P., Hernández, E.S.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v59_n5_p3902_Capuzzi
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spelling todo:paper_10502947_v59_n5_p3902_Capuzzi2023-10-03T15:59:10Z Barrier effects on the collective excitations of split Bose-Einstein condensates Capuzzi, P. Hernández, E.S. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v59_n5_p3902_Capuzzi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
format JOUR
author Capuzzi, P.
Hernández, E.S.
spellingShingle Capuzzi, P.
Hernández, E.S.
Barrier effects on the collective excitations of split Bose-Einstein condensates
author_facet Capuzzi, P.
Hernández, E.S.
author_sort Capuzzi, P.
title Barrier effects on the collective excitations of split Bose-Einstein condensates
title_short Barrier effects on the collective excitations of split Bose-Einstein condensates
title_full Barrier effects on the collective excitations of split Bose-Einstein condensates
title_fullStr Barrier effects on the collective excitations of split Bose-Einstein condensates
title_full_unstemmed Barrier effects on the collective excitations of split Bose-Einstein condensates
title_sort barrier effects on the collective excitations of split bose-einstein condensates
url http://hdl.handle.net/20.500.12110/paper_10502947_v59_n5_p3902_Capuzzi
work_keys_str_mv AT capuzzip barriereffectsonthecollectiveexcitationsofsplitboseeinsteincondensates
AT hernandezes barriereffectsonthecollectiveexcitationsofsplitboseeinsteincondensates
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