BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Nonequilibrium dynamical mean field theory
DTSTART:20260320T151500
DTEND:20260320T161500
DTSTAMP:20260927T031132Z
UID:61c0f4268cd350e8758866544be0c947049c71e86eb55fb3d2eb069d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Philipp Werner\, University of Fribourg\, Switzerland\
 nAbstract: Dynamical mean field theory\, which maps a lattice system onto 
 an effective impurity problem\, is a versatile tool for the study of corre
 lated electron systems. I will explain the extension of this formalism to
  nonequilibrium problems [1]\, and describe some impurity solvers\, which 
 have been used to solve the nonequilibrium DMFT equations. As a first appl
 ication\, I will show how AC electric field quenches can be used to contr
 ol the electron-electron interaction in metals [2]. The second application
  is the demonstration of an η-pairing state with high effective temperat
 ure in photo-doped Mott insulators [3]. \n\n\n[1] Hideo Aoki\, Naoto T
 suji\, Martin Eckstein\, Marcus Kollar\, Takashi Oka\, Philipp Werner\
 , Nonequilibrium dynamical mean-field theory and its applications\, Rev
 . Mod. Phys. 86\, 779 (2014).\n[2] Naoto Tsuji\, Takashi Oka\, Philipp 
 Werner\, Hideo Aoki\, Dynamical band flipping in fermionic lattice syste
 ms: An ac-field-driven change of the interaction from repulsive to attract
 ive\, Phys. Rev. Lett. 106\, 236401 (2011).\n[3] Lei Geng\, Aaram J. Ki
 m\, Philipp Werner\, High-temperature η-pairing superconductivity in t
 he photodoped Hubbard model\, arXiv:2602.17238 (2026).\n\n\nBio:\nPhilip
 p Werner is a specialist on the dynamical mean field simulation of strongl
 y correlated electron systems. His development of powerful numerical algor
 ithms has enabled systematic investigations of important classes of correl
 ated materials\, such as unconventional superconductors\, and has opened n
 ew lines of research. In particular\, the development of non-equilibrium d
 ynamical mean field theory over the past 10 years has resulted in a versat
 ile theoretical framework for the study of ultrafast processes in solids. 
 Philipp Werner studied physics at EPFL. His Master thesis advisor was Prof
 . Jürg Fröhlich from ETHZ. He did his PhD at ETHZ under the supervision 
 of Prof. Matthias Troyer. After a postdoc at Columbia University with Prof
 . Andrew J. Millis\, he returned to Switzerland in 2008 as Swiss National 
 Science Foundation Professor at the Institute for Theoretical Physics at E
 THZ. He then joined the University of Fribourg as Associate Professor in 2
 012 where he got promoted to full Professor in Fribourg in 2018.\n\n\n\n 
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR