Séminaire du RQMP

Superconductivity in ultra-quantum matter: Part I

André-Marie Tremblay,

Département de physique, Institut quantique, et RQMP

Sherbrooke, Québec J1K 2R1

Jeudi, 30 septembre, 2021

10:30

Hybride:D4-2019 et https://us02web.zoom.us/j/9878458456

Mot de passe: 137

Abstract: Copper-based superconductors have a single band near the Fermi surface, net spin 1/2 in the unit cell and effective interactions that are as large as kinetic energy. All of this makes quantum fluctuations very important. Their phase diagram is thus a challenge for the usual tools of solid state physics.

I will show how a perspective that takes into account both the localized and delocalized aspects of conduction electrons can explain, at least qualitatively, most experiments. More specifically, I will show that the work of several groups using cluster extensions of dynamical mean-field theory sheds light on phenomena characteristic of this class of systems: the pseudogap, the quantum-critical phenomena and d-wave superconductivity.

In another talk,Part II, I will argue that we know what leads to the largest transition temperature.