Condensed Matter Seminar Announcement Prof. Alexandru Macridin University of Cincinnati " Investigation of Cuprate Superconductors with the Dynamical Cluster Approximation " Date: Thursday, April 21, 2005 416 Phy/Geo Time: 4:10 pm. Abstract: Since their discovery, almost twenty years ago, the high Tc superconductors have been a puzzle for physicists due to the lack of a reliable theory to deal with strongly correlated systems. The cuprates are quasi-two-dimensional materials, with a local Coulomb repulsion of the same order of magnitude as the kinetic bandwidth, characterized by strong short-range correlations. We employ a recent developed technique, the Dynamical Cluster Approximation (DCA), to study these systems. The DCA maps the lattice to a finite-size cluster embedded self-consistently in a host. The non-local correlations up to the cluster size are treated explicitly while the physics on longer length scales is treated at the mean-field level. Our calculations manage to capture the basic physics of cuprates such as the antiferromagnetism, the superconductivity and the presence of the pseudogap in the underdoped regime.

E-Mail: alexandr@physics.uc.edu
Web Page: http://www.uc.edu