Chiral symmetry breaking and phase fluctuations: A QED3 theory of the pseudogap state in cuprate superconductors
Z. Tešanović, O. Vafek, M. Franz
DOI 10.1103/PhysRevB.65.180511 · Physical Review B
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Abstract
A d-wave superconductor, its phase coherence progressively destroyed by unbinding of vortex-antivortex pairs, suffers an instability related to chiral-symmetry breaking in QED3. The chiral manifold exhibits large degeneracy spanned by physical states acting as inherent “competitors” of d-wave superconductivity. Two of these states are associated with antiferromagnetic insulator and “stripe” phases, known to be stable in the pseudogap regime of cuprates near half-filling. The theory also predicts an additional, yet unobserved state: a d+ip phase-incoherent superconductor.
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