Drag of superfluid current in bilayer Bose systems

Details Drag of superfluid current in bilayer Bose systems Drag of superfluid current in bilayer Bose systems

2003-05-13

arxiv.org/abs/cond-mat/0305290v2

Low Temp. Phys. -- 2004 -- V. 30, - pp. 770-777

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 2 figures, new section is added, refs are added

Scientific paper

10.1063/1.1808194

An effect of nondissipative drag of a superfluid flow in a system of two Bose gases confined in two parallel quasi two-dimensional traps is studied. Using an approach based on introduction of density and phase operators we compute the drag current at zero and finite temperatures for arbitrary ratio of densities of the particles in the adjacent layers. We demonstrate that in a system of two ring-shape traps the "drag force" influences on the drag trap in the same way as an external magnetic flux influences on a superconducting ring. It allows to use the drag effect to control persistent current states in superfluids and opens a possibility for implementing a Bose analog of the superconducting Josephson flux qubit.

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