Journal of Low Temperature Physics

, Volume 181, Issue 3, pp 171–181

Resonances and Dynamical Fragmentation in a Stirred Bose–Einstein Condensate

Article

DOI: 10.1007/s10909-015-1335-5

Cite this article as:
Tsatsos, M.C. & Lode, A.U.J. J Low Temp Phys (2015) 181: 171. doi:10.1007/s10909-015-1335-5

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 \(N=101\) 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.

Keywords

Ultracold Bose gas Quantized vortex Phantom vortex Many-body physics MCTDHB http://ultracold.org 

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil
  2. 2.Department of PhysicsUniversity of BaselBaselSwitzerland

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