Effect of orbital currents on the restricted optical conductivity sum rule

2003/05/31 by L. Benfatto, S. G. Sharapov, H. Beck · 3 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1140/epjb/e2004-00219-5

published as Eur. Phys. J. B 39, 469 (2004) · Revised version, to appear in EPJB

openalex publication_date 2004/06/01 · arxiv created 2004/06/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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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