Phase structure of lattice SU(2)circle times U-S(1) three-dimensional gauge theory

Farakos, K; Mavromatos, NE; McNeill, D

dc.contributor.author	Farakos, K	en
dc.contributor.author	Mavromatos, NE	en
dc.contributor.author	McNeill, D	en
dc.date.accessioned	2014-03-01T01:48:59Z
dc.date.available	2014-03-01T01:48:59Z
dc.date.issued	1999	en
dc.identifier.issn	0556-2821	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25643
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	CHIRAL-SYMMETRY-BREAKING	en
dc.subject.other	T-J MODEL	en
dc.subject.other	(2+1)-DIMENSIONAL QUANTUM ELECTRODYNAMICS	en
dc.subject.other	2+1 DIMENSIONS	en
dc.subject.other	2-DIMENSIONAL SUPERCONDUCTIVITY	en
dc.subject.other	C SUPERCONDUCTORS	en
dc.subject.other	HUBBARD-MODEL	en
dc.subject.other	NORMAL-STATE	en
dc.subject.other	FERMIONS	en
dc.subject.other	YBA2CU3O7-DELTA	en
dc.title	Phase structure of lattice SU(2)circle times U-S(1) three-dimensional gauge theory	en
heal.type	journalArticle	en
heal.identifier.secondary	034502	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	We discuss a phase diagram for a relativistic SU(2) X U-S(1) lattice gauge theory, with emphasis on the formation of a parity-invariant chiral condensate, in the case when the U-S(1) field is infinitely coupled, and the SU(2) held is moved away from infinite coupling by means of a strong-coupling expansion. We provide analytical arguments on the existence of (and partially derive) a critical line in coupling space, separating the phase of broken SU(2) symmetry from that where the symmetry is unbroken. We review unconventional (Kosterlitz-Thouless type) superconducting properties of the model, upon coupling it to external electromagnetic potentials. We discuss the role of instantons of the unbroken subgroup U(1) is an element of SU(2), in eventually destroying superconductivity under certain circumstances. The model may have applications to the theory of high-temperature superconductivity. In particular, we argue that in the regime of the couplings lending to the broken SU(2) phase, the model may provide an explanation on the appearance of a pseudogap phase, lying between the antiferromagnetic and the superconducting phases. In such a phase, a fermion mass gap appears in the theory, but there is no phase coherence, due to the Kosterlitz-Thouless mode of symmetry breaking. The absence of superconductivity in this phase is attributed to nonperturbative effects (instantons) of the gauge field U(1) is an element of SU(2). [S0556-2821(99)04701-3].	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW D	en
dc.identifier.isi	ISI:000078586800037	en
dc.identifier.volume	5903	en
dc.identifier.issue	3	en