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Optical-conductivity sum rule in cuprates and unconventional charge density waves: a short review
L. Benfatto, S. Sharapov
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 w…
The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50
J. Hwang, J. Yang, T. Timusk +5
The a-axis optical properties of a detwinned single crystal of YBa_2Cu_3O_6.50 in the ortho II phase (Ortho II Y123, T_c= 59 K) were determined from reflectance data over a wide fr…
Ward identity and optical-conductivity sum rule in the d-density wave state
L. Benfatto, S. Sharapov, N. Andrenacci +1
We consider the role of the Ward identity in dealing with the transport properties of an interacting system forming a d-wave modulated charge-density wave or staggered flux phase.…
d-density wave state in an external magnetic field
S. G. Sharapov, V. P. Gusynin, H. Beck
We present a study of the electrical and thermal conductivities of the -density wave (DDW) state in an external magnetic field in the low temperature regime and in the prese…
Phase Fluctuations and Pseudogap Phenomena
Vadim M. Loktev, Rachel M. Quick, Sergei G. Sharapov
This article reviews the current status of precursor superconducting phase fluctuations as a possible mechanism for pseudogap formation in high-temperature superconductors. In part…
The Coleman-Weinberg effective potential in the theory of superconductivity
Rachel M. Quick, Sergei G. Sharapov
A quasi two-dimensional non-relativistic four-Fermi theory is studied at finite temperatures in the next-to-leading order approximation using the Coleman-Weinberg effective potenti…