Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.2: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Influence of inhomogeneous orderings on charge transport in a Falicov-Kimball heterostructure — •Rudolf Smorka, Martin Žonda, and Michael Thoss — Albert-Ludwigs-Universität Freiburg i. Br., Deutschland

The spinless Falicov-Kimball model outside the particle-hole symmetric point exhibits different stable inhomogeneous charge orderings. Among these are well-known charge stripes and a variety of orderings with phase separated domains, which influence the charge transport through the correlated electron system significantly. In this work, we will show these effects by investigating a heterostructure, where the Falicov-Kimball model on a finite two-dimensional lattice is located between two non-interacting semi-infinite leads. We use a combination of nonequilibrium Green’s functions techniques with a sign-problem-free Monte Carlo method for finite temperatures, and simulated annealing technique for the ground state, to address steady-state transport through the system. Our study shows that different ground-state phases of the central system can lead to simple metallic-like or insulating charge transport characteristics, but also to more complicated current-voltage dependencies reflecting a multi-band character of the transmission function. As temperature is increased, there is a tendency towards formation of transient phases before the system reaches a disordered phase. This leads to nontrivial temperature dependencies of transmission function and charge current.