Quantum critical metals: Theory and numerical experiments

Quantum critical phenomena are believed to play a key role in many strongly correlated materials, including several families of high-temperature superconductors. Theoretically, the problem of quantum criticality in the presence of a Fermi surface has proven to be highly challenging. However it has recently been realized that many models used to describe such systems are amenable to numerically exact solution by quantum Monte Carlo (QMC) techniques, without suffering from the fermion sign problem. I will discuss the status of the understanding of metallic quantum criticality and the progress made by recent QMC simulations. I'll describe the results obtained so far and their implications for superconductivity, non-Fermi liquid behavior, and transport near metallic quantum critical points.

link to the seminar