Johannes Bauer (SIMES Friday Seminar)

Date(s) - Apr 26 2013
11:00 AM - 12:30 PM

Shasta Room, Bldg 40, Room 361


Effects of symmetry breaking in correlated electron systems with competing instantaneous and retarded interactions

Johannes Bauer

Harvard University

The interplay of the instantaneous Coulomb repulsion with the retarded electron-phonon interaction leads to rich physics and can be responsible for intriguing phase diagrams for correlated electrons. Based on a model with local interactions, I will discuss the competition of antiferromagnetic and charge ordered ground states and transitions between these ordered states. I will also show that the interplay leads to interesting signatures for kinks in the electronic dispersion, possibly relevant for the cuprate superconductors. For electron-phonon induced superconductivity we studied retardation effects, and I will demonstrate the importance of corrections to the conventional result for the Coulomb pseudo-potential.