Effect of orbital currents on the restricted optical sum rule

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.

arXiv commentRevised version, to appear in EPJB

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Cited by in corpus (16)

• Frequency-dependent Thermal Response of the Charge System and Restricted Sum Rules in La(2-x)Sr(x)CuO(4)
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• Impact of a finite cut-off for the optical sum rule in the superconducting state
• Downward shift of infrared conductivity spectral weight at the DDW transition: role of anisotropy
• Optical conductivity and the sum rule in the DDW state