arXiv subjects

V. M. Kaurov

Publications and source records attributed to V. M. Kaurov.

3 recordsLinked to original sources

arXiv2005

Atomic Josephson vortex

We show that Josephson vortices in a quasi-1D atomic Bose Josephson junction can be controllably manipulated by imposing a difference of chemical potentials on the atomic BEC waveguides forming the junction. This effect, which has its origin in the Berry phase structure of a vortex, turns out to be very robust in the whole range of the parameters where such vortices can exist. We also propose that a Josephson vortex can be created by the phase imprinting technique and can be identified by a specific tangential feature in the interference picture produced by expanding clouds released from the waveguides.

cond-mat.other↗

arXiv2005

Drag effect and topological complexes in strongly interacting two-component lattice superfluids

The mutual drag in strongly interacting two-component superfluids in optical lattices is discussed. Two competing drag mechanisms are the vacancy-assisted motion and proximity to the quasi-molecular state, in which an integer number $q$ of atoms (or holes) of one component might be bound to one atom (or hole) of the other component. Then the lowest energy topological excitation (vortex or persistent current) becomes a composite object consisting of $q$ circulation quanta of one component and one circulation of the other. In the SQUID-type geometry, the value of $q$ can become fractional. These topological complexes can be detected by absorptive imaging. We present both the mean field and Monte Carlo results. The drag effects in optical lattices are drastically different from the Galilean invariant Andreev-Bashkin effect in liquid helium.

cond-mat.soft↗

arXiv2004

Interconversion of dark soliton and Josephson vortex in a quasi-1D long Bose Josephson junction

Dark soliton (DS) and Josephson vortex (JV) in quasi-1D long Bose Josephson junction (BJJ) can be interconverted by tuning Josephson coupling. Rates of the interconversion as well as of the thermally activated phase-slip effect, resulting in the JV switching its vorticity, have been evaluated. The role of quantum phase-slip in creating superposition of JVs with opposite vorticities as a qubit is discussed as well. Utilization of the JV for controlled and coherent transfer of atomic Bose-Einstein condensate (BEC) is suggested.

cond-mat.soft↗