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Resonances and Dynamical Fragmentation in a Stirred Bose-Einstein Condensate

Tsatsos, M. C. and Lode, A. U. J.. (2015) Resonances and Dynamical Fragmentation in a Stirred Bose-Einstein Condensate. Journal of low temperature physics, 181 (3). pp. 171-181.

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Official URL: http://edoc.unibas.ch/40036/

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Abstract

Superfluids are distinguished from ordinary fluids by the quantized manner in which the rotation is manifested in them. Precisely, quantized vortices are known to appear in the bulk of a superfluid subject to external rotation. In this work we study a trapped ultracold Bose gas of atoms interacting with finite-range potential in two spatial dimensions that is stirred by a rotating beam. We use the multiconfigurational Hartree method for bosons, which goes beyond the mainstream mean-field theory, to calculate the dynamics of the gas in real time. As the gas is rotated, the wavefunction of the system changes symmetry and topology. We see a series of resonances, i.e., peaks in the total energy, as the stirring frequency is increased. Fragmentation and a change of the symmetry of the density of the gas accompany the appearance of these resonances. We conclude that fragmentation of the gas appears hand-in-hand with resonant absorption of energy and angular momentum from the external agent of rotation.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Lode, Axel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:0022-2291
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:00
Deposited On:02 May 2016 11:02

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