Tsatsos, M. C. and Lode, A. U. J.. (2015) Resonances and Dynamical Fragmentation in a Stirred BoseEinstein Condensate. Journal of low temperature physics, 181 (3). pp. 171181.
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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 finiterange 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 meanfield 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 handinhand 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:  00222291 
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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