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Published on: March 30, 2017
Superfluid-superfluid phase transitions in a two-component Bose-Einstein condensate
Anatoly Kuklov1, Nikolay Prokof'ev, Boris Svistunov
1Department of Engineering Science and Physics, The College of Staten Island, City University of New York, Staten Island, New York 10314, USA.
Abstract:
Depending on the Hamiltonian parameters, two-component bosons in an optical lattice can form at least three different superfluid phases in which both components participate in the superflow: a (strongly interacting) mixture of two miscible superfluids (2SF), a paired superfluid (PSF) vacuum, and (at a commensurate total filling factor) the super-counter-fluid (SCF) state. We study the universal properties of the 2SF-PSF and 2SF-SCF quantum phase transitions and show that (i) they can be mapped onto each other and (ii) their universality class is identical to the (d+1)-dimensional normal-superfluid transition in a single-component liquid. The finite-temperature 2SF-PSF(SCF) transitions and the topological properties of 2SF-PSF(SCF) interfaces are also discussed.
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