Effect of orbital currents on the restricted optical sum rule
强关联电子
2007-05-23 v2 超导电性
摘要
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- cuprates above the critical temperature . We extend our results to the superconducting state, and comment on the differences and analogies between these two symmetry-breaking phenomena.
引用
@article{arxiv.cond-mat/0305276,
title = {Effect of orbital currents on the restricted optical sum rule},
author = {L. Benfatto and S. G. Sharapov and H. Beck},
journal= {arXiv preprint arXiv:cond-mat/0305276},
year = {2007}
}
备注
Revised version, to appear in EPJB