Year: 1998
Type: article
Abstract: Motivated by experiments on Bose atoms in traps which have attractive interactions (e.g., ${}^{7}\mathrm{Li}$), we consider two models which may be solved exactly. We construct the ground states subject to the constraint that the system is rotating with angular momentum proportional to the number of atoms. In a conventional system this would lead to quantized vortices; here, for attractive interactions, we find that the angular momentum is absorbed by the center of mass motion. Moreover, the state is uncondensed and is an example of a ``fragmented'' condensate discussed by Nozi\`eres and Saint James. The same models with repulsive interactions are fully condensed in the thermodynamic limit.
Source: Physical Review Letters
Authors: N. K. Wilkin, J. M. F. Gunn, R. A. Smith
Institution: University of Birmingham
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1983653625