Effective theory of fluctuating orbital currents in high-Tc cuprate superconductors
Kjetil Børkje, Asle Sudbø
DOI 10.1103/PhysRevB.77.092404 · Physical Review B
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Abstract
We derive an effective dissipative quantum field theory for fluctuating orbital currents in clean CuO2 sheets of high-Tc cuprates based on a three-band model. The Coulomb repulsion term between Cu and O sites is decoupled in terms of current operators representing horizontal and vertical parts of circulating currents within each CuO2 unit cell of the lattice. The model has ordering of currents at finite temperatures. The dissipative kernel in the model is of the form ∣ω∣∕∣q∣, indicating Landau damping. Applications of the effective theory to other models are also discussed.
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