Velocity anisotropy and the antiferromagnetic instability in the QED(3) theory of underdoped cuprates

Article

关键词: CHIRAL-SYMMETRY BREAKING;    SUPERCONDUCTORS;    BEHAVIOR;    GRAPHITE;   

DOI  :  10.1103/PhysRevB.66.094512

来源: SCIE

【 摘 要 】

We consider the effective 2+1 dimensional electrodynamics (QED(3)) of low-energy quasiparticles coupled to fluctuating vortex loops in the d-wave superconductor, with the velocity (Dirac) anisotropy v(F)/v(Delta)not equal1. This theory should be relevant to the quantum superconductor-insulator transition in underdoped cuprates. Working in the customary large-N approximation, we find that weak anisotropy is a marginally irrelevant perturbation to the Lorentz invariant QED(3), and that the critical number N-c of Dirac fields below which the theory suffers the antiferromagnetic (chiral) instability stays the same.

【 授权许可】

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