Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1
TT 64.5: Vortrag
Donnerstag, 10. März 2016, 10:30–10:45, H22
An impurity solver for nonequilibrium dynamical mean field theory based on hierarchical quantum master equations — •Rainer Härtle1 and Andrew J. Millis2 — 1Institut für theoretische Physik, Georg-August-Universität Göttingen, Göttingen, Germany — 2Department of Physics, Columbia University, New York, USA
We present a new impurity solver for real-time and nonequilibrium dynamical mean field theory applications, based on the recently developed hierarchical quantum master equation approach [1,2]. Our method employs a hybridization expansion of the time evolution operator, including an advanced, systematic truncation scheme [2]. Convergence to exact results for not too low temperatures has been demonstrated by a direct comparison to quantum Monte Carlo simulations [3]. The approach is time-local, which gives us access to slow dynamics such as, e.g., in the presence of magnetic fields or exchange interactions and to nonequilibrium steady states [3,4]. Here, we present first results of this new scheme for the description of strongly correlated materials in the framework of dynamical mean field theory, including benchmark and new results for the Hubbard and periodic Anderson model.
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