Anomalous Superfluidity in (2+1)-Dimensional Two-Color Lattice QCD
- Department of Physics, Box 90305, Duke University, Durham, North Carolina 27708 (United States)
We study thermodynamics of strongly coupled lattice QCD with two colors of staggered fermions in 2+1 dimensions. The partition function of this model can be written elegantly as a statistical mechanics of dimers and baryon loops. The model is invariant under an SO(3)xU(1) symmetry. At low temperatures, we find evidence for superfluidity in the U(1) symmetry sector while the SO(3) symmetry remains unbroken. The finite temperature phase transition appears to belong to the Kosterlitz-Thouless universality class, but the superfluid density jump {rho}{sub s}(T{sub c}) at the critical temperature T{sub c} is anomalously higher than the normal value of 2T{sub c}/{pi}. We show that, by adding a small SO(3) symmetry breaking term to the model, the superfluid density jump returns to its normal value, implying that the extra symmetry causes anomalous superfluid behavior. Our results may be of interest to researchers studying superfluidity in spin-1 systems.
- OSTI ID:
- 20861082
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.97.182001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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