Quantum Phase Transitions and Strongly Correlated Electrons

Qimiao Si, Department of Physics & Astronomy

Rice University                        

Résumé/abstract:

Electronic materials exhibit diverse physical properties, some of which “merely” inspire our curiosity, while others change the way we live our lives. When electronic correlations are strong, the behavior is even richer but the theory becomes notoriously difficult.

The fundamental question is how the electrons are organized and, in particular, whether there are principles that are universal among the various classes of strongly correlated systems. One such principle, which has come to prominence in recent years, is quantum criticality. It describes the collective fluctuations of matter undergoing a continuous phase transition at absolute zero.

In this talk, I will introduce the basics about quantum criticality, and describe some of the recent progresses that have been made. The focus will be on a particularly active setting -- strongly correlated electron systems at the border of magnetism. I will also outline some open issues and future directions, including on the interplay between magnetic quantum criticality and unconventional superconductivity.

Cette conférence s'adresse à tous, y compris les professeurs, les chercheurs et les étudiants des trois cycles.

Le café est servi à partir de 11h20.

Cette conférence est présentée par le Département de physique de l'Université de Montréal.