Controlled quantum stirring of Bose-Einstein condensates

Details Controlled quantum stirring of Bose-Einstein condensates Controlled quantum stirring of Bose-Einstein condensates

2008-06-23

arxiv.org/abs/0806.3490v1

Phys. Rev. A 78, 013602 (2008)

Physics

Condensed Matter

Other Condensed Matter

12 pages, 8 figures

Scientific paper

10.1103/PhysRevA.78.013602

By cyclic adiabatic change of two control parameters of an optical trap one can induce a circulating current of condensed bosons. The amount of particles that are transported per period depends on the "radius" of the cycle, and this dependence can be utilized in order to probe the interatomic interactions. For strong repulsive interaction the current can be regarded as arising from a sequence of Landau-Zener crossings. For weaker interaction one observes either gradual or coherent mega crossings, while for attractive interaction the particles are glued together and behave like a classical ball. For the analysis we use the Kubo approach to quantum pumping with the associated Dirac monopoles picture of parameter space.

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