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TT: Fachverband Tiefe Temperaturen

TT 70: Correlated Electrons: General Theory 2

TT 70.3: Vortrag

Freitag, 15. März 2013, 10:00–10:15, H24

A variational cluster approach to strongly correlated quantum systems out of equilibrium — •Martin Nuss, Enrico Arrigoni, and Wolfgang von der Linden — Institute of Theoretical and Computational Physics, Graz University of Technology, Petersgasse 16 8010 Graz , Austria

The theoretical understanding of the non-equilibrium behaviour of strongly correlated quantum many-body systems is a long standing challenge, which has become increasingly relevant with the progress made in the fields of molecular-and nano- electronics, spintronics, spectroscopy or quantum optics and simulation. We report on the development of non-equilibrium cluster perturbation theory, and its variational improvement, the non-equilibrium variational cluster approach for steady-state situations. Both methods are based on the Keldysh Green's function technique which allows accessing single particle dynamic quantities. These flexible and versatile techniques can in principle be applied to any fermionic / bosonic lattice Hamiltonian, including multi-band and multi-impurity systems. We present results for the steady-state of molecular / nanoscopic devices under bias including the effects of electron-electron interactions and magnetic fields.