Effective theory of fluctuating circulating currents in high-Tc cuprates

Details Effective theory of fluctuating circulating currents in high-Tc cuprates Effective theory of fluctuating circulating currents in high-Tc cuprates

2008-01-30

arxiv.org/abs/0801.4611v1

Phys. Rev. B 77, 092404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure, 16 references. To be published in Physical Review B

Scientific paper

10.1103/PhysRevB.77.092404

We derive an effective dissipative quantum field theory for fluctuating orbital currents in clean $CuO_2$ sheets of high-$T_c$ 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 $CuO_2$ unit cell of the lattice. The model has ordering of currents at finite temperatures. The dissipative kernel in the model is of the form $|\omega|/|{\bf q}|$, indicating Landau damping. Applications of the effective theory to other models are also discussed.

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