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FM: Fall Meeting

FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems

FM 63.14: Poster

Mittwoch, 25. September 2019, 16:30–18:30, Tents

Electronic transport in the spinless Falicov-Kimball model with inhomogeneous charge orderings — •Rudolf Smorka, Martin Zonda, and Michael Thoss — Albert-Ludwigs-Universität Freiburg, Institute of Physics

The ordered phases of the spinless Falicov-Kimball model (FKM) outside the particle-hole symmetric point display a variety of stable inhomogeneous charge orderings. These include exotic charge stripes and charge segregation orderings which are also observed experimentally in various strongly correlated materials. In our work, we investigate theoretically how different ordered phases, both homogeneous and inhomogeneous, influence the non-equilibrium charge transport through a correlated material. We focus on a heterostructure, where a two-dimensional correlated system modelled by FKM on a square lattice is sandwiched between two non-interacting semi-infinite leads. First, we determine the ground state configurations of the central system as a function of chemical potential by employing a canonical Monte-Carlo based simulated annealing procedure. Then we couple the system to the leads with mutually shifted chemical potentials used to introduce a non-equilibrium steady state. The transmission function and the current-voltage characteristics are approached with a non-equilibrium Green's function technique for various stable phases. We show, that different orderings lead to qualitatively different transport characteristics showing metallic, insulating or even multi-gap properties. The study of the most interesting cases is further extended to finite temperatures.