Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates

We present a numerical calculation of the velocity field of an off-axis vortex within a harmonic trapping potential. We consider a condensate with a large number of particles which, in spite of being in the Thomas-Fermi regime, possesses a non-totally-negligible vortex core size. Via a simple, yet r...

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Autores principales: Jezek, D.M., Cataldo, H.M.
Formato: JOUR
Materias:
Bose-Einstein condensation
Fermi level
Molecular physics
Optical systems
Vortex flow
Harmonic trapping
Thomas-Fermi regime
Vortex core size
Vortex velocity fields
Flow velocity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v77_n4_p_Jezek
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10502947_v77_n4_p_Jezek2023-10-03T15:59:56Z Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates Jezek, D.M. Cataldo, H.M. Bose-Einstein condensation Fermi level Molecular physics Optical systems Vortex flow Harmonic trapping Thomas-Fermi regime Vortex core size Vortex velocity fields Flow velocity We present a numerical calculation of the velocity field of an off-axis vortex within a harmonic trapping potential. We consider a condensate with a large number of particles which, in spite of being in the Thomas-Fermi regime, possesses a non-totally-negligible vortex core size. Via a simple, yet realistic, modeling of the vortex-state density, we derive, by treating the equation of continuity outside and inside the vortex core, respective equations for the velocity field and the vortex precession velocity. We find that the vortex precession velocity is given by two contributions: the background velocity field evaluated around the border of the core and another term which depends on the core shape. Our findings concerning the velocity field outside the vortex core are in good agreement with previous theoretical predictions in a narrow region around it, while far away from the vortex we observe a field with a large asymmetry with respect to the vortex position. We show that a better approximation may be obtained by adding the velocity field produced by an antivortex located outside the condensate. © 2008 The American Physical Society. Fil:Jezek, D.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cataldo, H.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v77_n4_p_Jezek
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bose-Einstein condensation
Fermi level
Molecular physics
Optical systems
Vortex flow
Harmonic trapping
Thomas-Fermi regime
Vortex core size
Vortex velocity fields
Flow velocity
spellingShingle Bose-Einstein condensation
Fermi level
Molecular physics
Optical systems
Vortex flow
Harmonic trapping
Thomas-Fermi regime
Vortex core size
Vortex velocity fields
Flow velocity
Jezek, D.M.
Cataldo, H.M.
Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
topic_facet Bose-Einstein condensation
Fermi level
Molecular physics
Optical systems
Vortex flow
Harmonic trapping
Thomas-Fermi regime
Vortex core size
Vortex velocity fields
Flow velocity
description We present a numerical calculation of the velocity field of an off-axis vortex within a harmonic trapping potential. We consider a condensate with a large number of particles which, in spite of being in the Thomas-Fermi regime, possesses a non-totally-negligible vortex core size. Via a simple, yet realistic, modeling of the vortex-state density, we derive, by treating the equation of continuity outside and inside the vortex core, respective equations for the velocity field and the vortex precession velocity. We find that the vortex precession velocity is given by two contributions: the background velocity field evaluated around the border of the core and another term which depends on the core shape. Our findings concerning the velocity field outside the vortex core are in good agreement with previous theoretical predictions in a narrow region around it, while far away from the vortex we observe a field with a large asymmetry with respect to the vortex position. We show that a better approximation may be obtained by adding the velocity field produced by an antivortex located outside the condensate. © 2008 The American Physical Society.
format JOUR
author Jezek, D.M.
Cataldo, H.M.
author_facet Jezek, D.M.
Cataldo, H.M.
author_sort Jezek, D.M.
title Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
title_short Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
title_full Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
title_fullStr Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
title_full_unstemmed Vortex velocity field in inhomogeneous media: A numerical study in Bose-Einstein condensates
title_sort vortex velocity field in inhomogeneous media: a numerical study in bose-einstein condensates
url http://hdl.handle.net/20.500.12110/paper_10502947_v77_n4_p_Jezek
work_keys_str_mv AT jezekdm vortexvelocityfieldininhomogeneousmediaanumericalstudyinboseeinsteincondensates
AT cataldohm vortexvelocityfieldininhomogeneousmediaanumericalstudyinboseeinsteincondensates
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