Programme

L.3.2 -- Lecture

Date: Monday, 20 November 2017

Time: 17:00 - 18:00

Quantum embedding theory in many body physics: dynamical mean-field theory and impurity solvers

Ara Go

Center for Theoretical Physics of Complex Systems, Institute for Basic Science

Strong correlations in many-body systems raise many emergent phenomena, such as high-$T_c$ superconductivity, Kondo effect, metal-insulator transition, and so on. The properties of the systems are not explained solely based on characters of individual components of the systems: the correlation is the key to understand the emergence. On the other hand, the correlation brings exponential increase of computational costs and therefore put great difficulties in solving the systems exactly. To obtain reliable information in strongly correlated systems, employing proper approximations is inevitable. The quantum embedding theory is one of the popular approximating schemes to solve the systems when local correlations play an important role. The local degrees of freedom are captured by quantum impurity problems exactly whereas the non-local parts reduce to an effective environment. In this lecture, I introduce the quantum embedding theory in many-body physics focusing on the dynamical mean-field theory with a brief overview of impurity solvers.

Presenter: Ara Go

Presentation file: