Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Focus Session: Realistic Dynamical Mean-Field Approaches
40mm to Correlated Quantum Materials

TT 52.6: Hauptvortrag

Mittwoch, 9. März 2016, 17:45–18:15, H20

Electron Correlations in Nanosystems and 2D Materials: What’s so Different from Bulk? — •Tim Wehling — University of Bremen, Bremen, Germany

To date, experimental nanofabrication techniques offer atomic scale control of correlated electron materials from Mott insulators and magnets to superconductors. Here, we discuss correlation effects in atomic scale structured systems based on a combination of first-principles and many-electron techniques. We show that substrate, environmental and doping effects can change Coulomb interactions in monolayer thin 2d materials on the eV scale [1], which has strong influence on electronic excitations and collective modes [2]. With two sets of magnetic systems, a Cr (001) surface and hydrogenated Fe adatoms on Pt (111), we address then how electronic hybridization and kinetic terms can be manipulated at the atomic scale. These terms control in both systems a delicate interplay of charge, spin, and orbital degrees of freedom and allow us to turn electronic correlation phenomena like the Kondo effect on and off [3].
M. Rösner et al., PRB 92, 085102 (2015)
A. Steinhoff et al., Nano Lett. 14, 3743 (2014)
A. Khajetoorians et al, Nature Nanotech. 10, 958 (2015).