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.
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Received: 30 April 2004, Published online: 23 July 2004
PACS:
71.10.-w Theories and models of many-electron systems - 74.25.Gz Optical properties - 72.15.-v Electronic conduction in metals and alloys - 74.72.-h Cuprate superconductors (high-T c and insulating parent compounds)
S.G. Sharapov: Present address: Institute for Scientific Interchange, via Settimio Severo 65, 10133 Torino, Italy
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Benfatto, L., Sharapov, S.G. & Beck, H. Effect of orbital currents on the restricted optical conductivity sum rule. Eur. Phys. J. B 39, 469–473 (2004). https://doi.org/10.1140/epjb/e2004-00219-5
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DOI: https://doi.org/10.1140/epjb/e2004-00219-5