Magnetooptics of oxide quantum wells

figure1

in cooperation with AG Prof. A. Lorke (U Duisburg)

Quantum wells created from high-quality epitaxial oxide layers allow to systematically engineer the optical band gap.

Using infrared transmission spectroscopy, we explore the fundamental optical properties of ultrathin ferromagnetic oxides down to the single monolayer level, where sizeable quantum size effects emerge.

G. Prinz, T. Gerber, A. Lorke, and M. Müller, “Quantum Confinement in EuO Heterostructures“, Appl. Phys. Lett. 109, 202401 (2016)

 


Redox-created electronic confinement at oxide interfaces

in collaboration with Prof. A. Santander-Syro (Université Paris-Sud)

The properties of oxide interfaces are inevitably linked to their thermodynamical properties. We fabricate a 2DEG in an oxide heterostructure  by using a pure elemental metal (Eu) to reduce the surface of SrTiO3. The existence of a redox-created 2DES at the interface between an oxidized ferromagnetic EuO layer and SrTiO3(001) is evidenced by angle-resolved photoemission spectroscopy (ARPES).

P. Lömker, T. Rödel, T. Gerber, P. LeFevre, F. Bertran, E. Frantzeskakis, M. Müller, A. F. Santander-Syro “A functional magnetic 2DEG created at a SrTiO3 interface“, in preparation (2017)

 


Spectroscopic insight into ferromagnet/topological insulator interfaces

in spp1666_logocooperation with Dr. Lukasz Plucinski (FZJ) and funded by DFG SPP-1666-2

Key goal of the project is to reveal the physical mechanism behin the current-induced spin-torque in a bilayer ferromagnet/3D toological insulator heterostructure. The remagnetization depends on the helicity of the spin momentum locking at the Fermi surface, which will be demonstrated by spinARPES.

 


Understanding the biocompatibility of oxide-liquid interfaces

in cooperation with Prof. Dr. Hendrik Bluhm (LBNL Berkeley)

toc_8Our goal is to monitor chemical processes at solid-liquid interfaces of functional oxide-coated metallic stent materials that shall withstand and even suppress corrosion and protein adhesion, using ambient-pressure XPS (APXPS).