Optical-conductivity sum rule in cuprates and unconventional charge density waves: a short review
L. Benfatto, S. Sharapov
Abstract
We begin with an overview of the experimental results for the temperature and doping dependences of the optical-conductivity spectral weight in cuprate superconductors across the whole phase diagram. Then we discuss recent attempts to explain the observed behavior of the spectral weight using reduced and full models with unconventional dx2-y2 charge-density waves.
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