Calculation of Path Integrals for Correlated Fermions: CTQMC Scheme

by Alexander Lichtenstein

Thursday 20 Dec 2012, 16:30 → 17:30 Europe/Berlin

Seminar room 2 (DESY Hamburg)

A broad class of fermionic path integrals for general impurity action which consists of finite correlated system surrounded by a single-particle bath can be calculated using continuous time quantum Monte Carlo (CTQMC) algorithm. The main idea of such stochastic diagrammatic approach for interacting bosons was known already for two decades, but only recently the way to overcome the fermionic sign problem for impurity action have been found. We discuss a various versions of CTQMC approach which are suitable for weak and strong coupling limits.