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Nonequilibrium effects in strongly correlated systems

  • Schmidt, P.
Publication Date
Jan 01, 2004
OpenGrey Repository


The dynamical mean field theory is extended using the Keldysh Green's function formalism to study strongly correlated systems away from equilibrium. This technique has been applied to two different systems, whose insulating behavior is due to electronic correlation effects: excitonic insulators and Mott insulators. The real-time development of the electronic properties of excitonic insulators, such as the distribution function and the gap, after an ultrashort intense is studied. The appropriate self-consistency equations turned out to be matrix equations in frequency and Keldysh space. The self-consistency equations derived for the two-plane Hubbard model with a periodic time-dependent coupling between the two planes are matrix equations in energy sidebands due to quasi-energy conservation modul of the external frequency. Numerical results are shown for the local density of states and the nonequilibrium optical conductivity, both exhibiting a sideband structure, with the number and weight of the sidebands depending on the strength of the perpendicular coupling. (orig.) / SIGLE / Available from TIB Hannover: RN 4852(2004-11) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / DE / Germany

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