Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Correlated Electrons: Poster Session

TT 21.33: Poster

Mittwoch, 7. September 2022, 15:00–18:00, P1

Electronic correlations in inhomogeneous model systems: Numerical simulation of spectra and transmission — •Andreas Weh¹, Wilhelm H. Appelt¹, Andreas Östlin², Liviu Chioncel², and Ulrich Eckern¹ — ¹Institute of Physics, University of Augsburg, 86135 Augsburg — ²EKM & ACIT, Institute of Physics, University of Augsburg, 86135 Augsburg

We investigate the effects of electronic correlations on the spectral and transport properties of inhomogeneous model systems. The models are based on the single-band Hubbard Hamiltonian, and electronic correlations are treated within dynamical mean-field theory (DMFT). In particular, continuous-time quantum Monte Carlo (CT-QMC) as well as the more recent tensor network methods (DMRG+TDVP) are employed as impurity solvers to study the spectral function of half-metallic ferromagents; a Bethe lattice as well as layered square-lattice structures are considered [1]. The transport properties through a barrier made of such a single interacting half-metallic layer is studied [2] employing the Meir–Wingreen formalism. In particular, we demonstrate that even for a single half-metallic layer, highly polarized transmissions are achievable.

[1] A. Weh, J. Otsuki, H. Schnait, H. G. Evertz, U. Eckern, A. I. Lichtenstein, L. Chioncel, Phys. Rev. Res. 2, 043263 (2020)

[2] A. Weh, W. H. Appelt, A. Östlin, L. Chioncel, U. Eckern, Phys. Status Solidi B 259, 2100157 (2021)