Café com Física



26 de março de 2014
Sala F-210

Alexander Punnoose

Quantum phase transitions in a disordered Fermi liquid and the metal-insulator transition in two dimensions

Electrons in a disordered system propagate diffusively at sufficiently low temperatures. It is well know that the effects of quantum diffusion are profound in two dimensions, even weak disorder leads to the complete destruction of the Fermi-liquid at low temperatures. In this talk, I will discuss recent theoretical progress in our understanding of disordered Fermi liquids in the context of scaling theory, the most promising analytical tool available to understand the physics of disordered systems. I will argue that the observed metal-insulator transition in two dimensions corresponds to a quantum critical point. The results of various experiments designed to test the predictions of the scaling theory will be detailed.