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• W1961770283 abstract "Thermal fluctuations and melting transitions for rotating single-component superfluids have been intensively studied and are well understood. In contrast, the thermal effects on vortex states for two-component superfluids with density-density interaction, which have a much richer variety of vortex ground states, have been much less studied. Here, we investigate the thermal effects on vortex matter in superfluids with $mathrm{U}(1)ifmmodetimeselsetexttimesfi{}mathrm{U}(1)$ broken symmetries and intercomponent density-density interactions, as well as the case with a larger $mathrm{SU}(2)$ broken symmetry obtainable from the $[mathrm{U}(1)ifmmodetimeselsetexttimesfi{}mathrm{U}(1)]$-symmetric case by tuning scattering lengths. In the former case we find that, in addition to first-order melting transitions, the system exhibits thermally driven phase transitions between square and hexagonal lattices. Our main result, however, concerns the case where the condensate exhibits $mathrm{SU}(2)$ symmetry, and where vortices are not topological. At finite temperature, the system exhibits effects which do not have a counterpart in single-component systems. Namely, it has a state where thermally averaged quantities show no regular vortex lattice, yet the system retains superfluid coherence along the axis of rotation. In such a state, the thermal fluctuations result in transitions between different (nearly) degenerate vortex states without undergoing a melting transition. Our results apply to multicomponent Bose-Einstein condensates, and we suggest how to detect some of these unusual effects experimentally in such systems." @default.
• W1961770283 created "2016-06-24" @default.
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• W1961770283 date "2015-01-06" @default.
• W1961770283 modified "2023-10-15" @default.
• W1961770283 title "Fluctuation effects in rotating Bose-Einstein condensates with broken SU(2) andU(1)×U(1)symmetries in the presence of intercomponent density-density interactions" @default.
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• W1961770283 doi "https://doi.org/10.1103/physreva.91.013605" @default.
• W1961770283 hasPublicationYear "2015" @default.
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