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 a quasimolecular state. In a case of strong drag, the lowest energy topological excitation (vortex or persistent current)...

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Bibliographic Details
Published in:Physical review letters 2005-08, Vol.95 (9), p.090403.1-090403.4, Article 090403
Main Authors: KAUROV, V. M, KUKLOV, A. B, MEYEROVICH, A. E
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: structure, mechanical and thermal properties
Dilute superfluid 3he in he ii
DRAG
Exact sciences and technology
GEOMETRY
HELIUM
Matter waves
MEAN-FIELD THEORY
Mixed systems
liquid 3He, 4He mixtures
MONTE CARLO METHOD
Physics
Quantum fluids and solids
liquid and solid helium
SQUID DEVICES
SUPERFLUIDITY
TOPOLOGY
VACANCIES
VORTICES
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Summary: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 a quasimolecular state. In a case of strong drag, the lowest energy topological excitation (vortex or persistent current) can consist of several circulation quanta. In the SQUID-type geometry, the circulation can become fractional. 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.090403