Hidden non-Abelian gauge symmetries in doped planar antiferromagnets

 
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1998 (EN)
Hidden non-Abelian gauge symmetries in doped planar antiferromagnets (EN)

Mavromatos, NE (EN)
Farakos, K (EN)

N/A (EN)

We investigate the possibility of hidden non-Abelian local phase symmetries in large-U doped planar Hubbard antiferromagnets, believed to simulate the physics of two-dimensional (magnetic) superconductors. We present a spin-charge separation ansatz, appropriate to incorporate holon spin flip, which allows for such a hidden local gauge symmetry to emerge in the effective action. The group is of the form SU(2)xU(S)(1)xU(em)(1), where SU(2) is a local non-Abelian group associated with the spin degrees of freedom, U-em(1) is that of ordinary electromagnetism, associated with the electric charge of the holes, and U-S(1) is a "statistical" Abelian gauge group pertaining to the fractional statistics of holes on the spatial plane. In certain regime of the parameters of the model, namely, strong U-S(1) and weak SU(2), there is the possibility of dynamical formation of a holon condensate. This leads to a dynamical breaking of SU(2)-->U(1). The resulting Abelian effective theory is closely related to an earlier model proposed as the continuum limit of large-spin planar doped antiferromagnets, which lead to an unconventional scenario for two-dimensional parity-invariant superconductivity. (EN)

journalArticle

BREAKING (EN)
HIGH-TC SUPERCONDUCTIVITY (EN)
Gauge Symmetry (EN)
FIELD-THEORY (EN)
FERMIONS (EN)
Abelian Group (EN)
HUBBARD-MODEL (EN)
Effective Action (EN)
Superconductors (EN)
Degree of Freedom (EN)
2+1 DIMENSIONS (EN)
QUANTUM ANTIFERROMAGNET (EN)
CORRELATED ELECTRONIC SYSTEMS (EN)
2-DIMENSIONAL SUPERCONDUCTIVITY (EN)
LATTICE (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Physical Review B - Condensed Matter and Materials Physics (EN)

1998


AMERICAN PHYSICAL SOC (EN)



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