Critical properties of the N-color London model

Details Critical properties of the N-color London model Critical properties of the N-color London model

2004-03-17

arxiv.org/abs/cond-mat/0403417v4

Phys.Rev.Lett. 93 (2004) 077002

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, new references added. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.93.077002

The critical properties of $N$-color London model are studied in $d=2+1$ dimensions. The model is dualized to a theory of $N$ vortex fields interacting through a Coulomb and a screened potential. The model with N=2 shows two anomalies in the specific heat. From the critical exponents $\alpha$ and $\nu$, the mass of the gauge field, and the vortex correlation functions, we conclude that one anomaly corresponds to an {\it inverted} \xy fixed point, while the other corresponds to a \xy fixed point. There are $N$ fixed points, namely one corresponding to an inverted \xy fixed point, and $N-1$ corresponding to neutral \xy fixed points. This represents a novel type of quantum fluid, where superfluid modes arise out of charged condensates.

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