Effect of orbital currents on the restricted optical sum rule

Details Effect of orbital currents on the restricted optical sum rule Effect of orbital currents on the restricted optical sum rule

2003-05-13

arxiv.org/abs/cond-mat/0305276v2

Eur. Phys. J. B 39, 469 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version, to appear in EPJB

Scientific paper

10.1140/epjb/e2004-00219-5

We derive the restricted optical-conductivity sum rule for a model with circulating orbital currents. It is shown that an unusual coupling of the vector potential to the interaction term of the model Hamiltonian results in a non-standard form of the sum rule. As a consequence, the temperature dependence of the restricted spectral weight could be compatible with existing experimental data for high-$T_c$ cuprates above the critical temperature $T_c$. We extend our results to the superconducting state, and comment on the differences and analogies between these two symmetry-breaking phenomena.

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