Ground-state properties, vortices, and collective excitations in a two-dimensional Bose-Einstein condensate with gravitylike interatomic attraction
Date
2008Source Title
Physical Review A - Atomic, Molecular, and Optical Physics
Print ISSN
1050-2947
Publisher
The American Physical Society
Volume
77
Issue
5
Language
English
Type
ArticleItem Usage Stats
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Abstract
We study the ground-state properties of a Bose-Einstein condensate with short-range repulsion and gravitylike 1/r interatomic attraction in two-dimensions (2D). Using the variational approach we obtain the ground-state energy and analyze the stability of the condensate for a range of interaction strengths in 2D. We also determine the collective excitations at zero temperature using the time-dependent variational method. We analyze the properties of the Thomas-Fermi-gravity and gravity regimes, and we examine the vortex states, finding the coherence length and monopole mode frequency for these regimes. Our results are compared and contrasted with those in 3D condensates.
Keywords
Atomic physicsGravity waves
Ground state
Molecular interactions
Phase stability
Vortex flow
Collective excitations
Fermi gravity
Gravitylike interatomic attraction
Interaction strengths
Bose-Einstein condensation