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.

Revised version, to appear in EPJB

References in corpus (1)

• Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x

Cited by in corpus (8)

• High-temperature optical spectral weight and Fermi liquid renormalization in Bi-based cuprates
• Optical-conductivity sum rule in cuprates and unconventional charge density waves: a short review
• Optical Sum Rule in Finite Bands
• Effects of a particle-hole asymmetric pseudogap on Bogoliubov quasiparticles
• Optical sum in Nearly Antiferromagnetic Fermi Liquid Model
• Impact of a finite cut-off for the optical sum rule in the superconducting state
• Temperature Dependence of the Conductivity Sum Rule in the Normal State due to Inelastic Scattering
• Optical conductivity and the sum rule in the DDW state