Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Complex Oxides: Surfaces and Interfaces (joint session TT/HL/MA)

TT 26.3: Vortrag

Dienstag, 17. März 2020, 14:30–14:45, HSZ 02

Sensitivity of non-local fluctuations on surface effects in ultra-thin SrVO3 films — •Matthias Pickem, Jan M. Tomczak, and Karsten Held — Institute of Solid State Physics, TU Wien, Austria

Recent experiments show that strong electronic correlations cause the conventional Fermi-liquid state of bulk SrVO3 to be destroyed in films below a critical thickness. However new experimental results challenge the current understanding of the details of this breakdown.

To this end we perform realistic density functional theory (DFT) + dynamical mean-field theory (DMFT) calculations of SrVO3 on SrTiO3 substrate. Depending on the simulated interface (SrVO3 termination, surface reconstructions, or additional SrTiO3 capping) we find that different mechanism cause this aforementioned break-down of the Fermi-liquid state.

Furthermore, calculations on the two-particle level (DMFT susceptibilities) reveal that the different interfaces result in vastly different instabilities.

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