Effect of orbital currents on the restricted optical conductivity sum rule

L. Benfatto (), S. Sharapov and H. Beck

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 39, issue 4, 469-473

Abstract: 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. Copyright Springer-Verlag Berlin/Heidelberg 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00219-5

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