"Order-parameter theories of Interaction-localization"

will be given by Prof. Dr. Vladimir Dobrosavljević (Florida State University).

Abstract of the talk:

The metal-insulator transition is the most fundamental open problem of solid state physics, because it requires an understanding of both strong electron-electron interactions and disorder due to defects of impurities. Traditional theories based on treating both disorder and the interactions using weak-coupling (perturbative) approaches have met very little success, requiring new methods. More recent work introduced dynamical mean-field theory (DMFT), which is currently regarded as the most successful non-perturbative method for strongly interacting electronic systems. Its simplest implementation in presence of disorder leads to the coherent potential approximation (CPA), which despite capturing some nontrivial disorder effects for correlated strongly electrons, is not able to describe disorder-induced bound state formation (Anderson localization). A more sophisticated DMFT-based approach to disorder, the typical medium theory (TMT), proves able to capture both Anderson localization and strong interaction effects at the same footing, thus representing a new order-parameter theory of the metal-insulator transition. In this talk we briefly review several recent applications of these methods, providing insight on how Anderson localization is affected by various interaction effects, including the electronic correlations of Mott-Hubbard type, the role of the lattice deformations and polaronic effects, as well as the effects of electron (Coulomb) glass formation.

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
•