Preemptive phase - transitions in multicomponent BECs 1
نویسنده
چکیده
Submitted for the MAR08 Meeting of The American Physical Society Preemptive phase-transitions in multicomponent BECs1 STEINAR KRAGSET2, Norw. Univ. of Sci & Tech, ESKIL KULSET DAHL, Norw Univ. of Sci & Tech, EGOR BABAEV, University of Massachusetts Amherst, ASLE SUDBO, Norw Univ of Sci & Tech — We use analytical arguments and large-scale Monte-Carlo simulations to investigate phase transitions between various complex superfluid phases in a two-component Bose-Einstein condensate with varying nondissipative drag between the two components. We focus on establishing the phasediagram and investigate in detail the individual and composite superfluid densities that the system features, using a representation in terms of the phases of the superfluid ordering fields. In particular, we describe a novel preemptive scenario, whereby drag induces a first-order phase transition from the interplay between two phase-transitions that individually would have been in the 3DXY -universality class. Our results may shed light on similar phenomena occuring in certain multicomponent superconductors and in scenarios of deconfined quantum criticality in certain quantum antiferromagnetic systems. 1Work supported by Research Council of Norway. 2Work supported by Norwegian Research Council Asle Sudbo Norwegian Univ. of Sci. & Tech Date submitted: 02 Dec 2007 Electronic form version 1.4
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