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Seminars & Lectures

* TITLE

Dynamical mean field approach to correlated electron systems in and out of equilibrium

* SPEAKERS

Name	Affiliation	E-mail
Prof. Philipp Werner		gsjeon(at)phya.snu.ac.kr

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2010-03-26, 4:30 pm

* PLACE

APCTP Seoul Branch Office

* ABSTRACT

Materials characterized by strong electron-electron correlations
exhibit some of the most remarkable properties found in condensed
matter systems. They may react very sensitively to changes in external
parameters, contain quasi-particles with unusually heavy masses or
show unconventional forms of superconductivity. While new classes of
interesting materials are being discovered at a constant pace, an
alternative perspective on their physics will soon be provided by pump-
probe experiments which measure the nonequilibrium properties of
correlated electron systems with femto-second time resolution. The
growing amount of experimental data provides a challenge to theorists
to develop the tools needed to gain insights into the behavior of
complex materials in and out of equilibrium. A very useful theoretical
framework is dynamical mean field theory (DMFT) [1], which is based
on the assumption of a momentum independent self-energy and therefore
allows to map a lattice problem to a quantum impurity model subject to
a self-consistency condition. I will explain how the recent
development of powerful diagrammatic Monte Carlo methods for impurity
models [2] enables the efficient investigation of realistic multi-
orbital models [3] and how the extension of the dynamical mean field
formalism to frequency dependent interactions will allow the \"ab-
initio\" simulation of strongly correlated materials [4]. I will
furthermore discuss how the DMFT method and diagrammatic impurity
solvers can be implemented on the real-time axis [5] and illustrate
the formalism with nonequilibrium DMFT results for the relaxation
dynamics of the Hubbard model [6].

[1] W. Metzner and D. Vollhardt, PRL 62, 324 (1989); A. Georges and
G. Kotliar, PRB 45, 6479 (1992)
[2] A. Rubtsov et al., PRB 72, 35122 (2005); P. Werner et al., PRL
97, 76405 (2006)
[3] P. Werner et al., PRL 101, 166405 (2008)
[4] F. Aryasetiawan et al., PRB 70, 195104 (2004); P. Werner and A. J.
Millis, arXiv:1001.1377 (2010)
[5] J. K. Freericks et al., PRL 97, 266408 (2006); P. Werner, T. Oka,
A. J. Millis, PRB 79, 035320 (2009)
[6] M. Eckstein, M. Kollar, P. Werner, PRL 103, 56403 (2009).

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