Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 81: Nonequilibrium Quantum Many-Body Systems III

TT 81.6: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, H 3010

Non-equilibrium Real-space DMFT for correlated heterostuctures — •Irakli Titvinidze, Max Sorantin, Antonius Dorda, Wolfgang von der Linden, and Enrico Arrigoni — Institute of theoretical and computational physics, Graz Univeristy of Technology, 8010 Graz, Austria.

We consider a system consisting of correlated monoatomic layers, sandwiched between two metallic leads. In addition to the local Hubbard interaction we also take the long-range Coulomb interaction into account, which causes electronic charge reconstruction not only in the correlated layers but also in the leads. The non-equilibrium situation is driven by applying a bias-voltage to the leads. We investigate the steady-state behavior of the system. In particular, we present results for the steady-state current, spectral functions, and electronic charge reconstruction. Depending on the particular parameters we either observe a capacitor-like behavior or one dominated by charge transport.

In order to investigate steady-state properties we use Non-equilibrium real-space dynamical mean-field theory (R-DMFT) [1-3] combined with the Poisson equation, both solved in a self-consistent fashion. To account for the charge reconstruction in the leads we include some lead layers explicitly in R-DMFT in addition to the correlated layers.
E. Arrigoni, M. Knap, and W. von der Linden, Phys. Rev. Lett 110, 086403 (2013).
I. Titvinidze, A. Dorda, W. von der Linden, and A. Arrigoni, Phys. Rev. B 94, 245142 (2016).
J.K. Freericks, Phys. Rev. B 70, 195342 (2004).