Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 35.3: Vortrag

Donnerstag, 4. April 2019, 11:00–11:15, H45

Mesoscopic THz imaging of quantum materials - The instrument perspective — •Marc Westig, Holger Thierschmann, Allard Katan, Matvey Finkel, and Teun M. Klapwijk — Department of Quantum Nanoscience, Kavli Institute of Nanoscience, TU Delft, The Netherlands

One of the challenges in modern condensed-matter physics is the fundamental understanding and technological use of quantum materials. In these materials, strong interactions between electrons and other quasi-particles lead to emerging properties. Examples are high-temperature superconductivity, magnetism and hydrodynamic electron flow in graphene. Another effect of strong electron interactions is that different ground states compete. In the detector-relevant disordered superconductors, this leads to electronic inhomogeneity over a range of few tens of nanometers. The consequences for their local electrodynamics are still unknown and, hence, how the detector sensitivity is influenced.

Motivated by these challenges, we have started to develop high-frequency local probe instruments ranging from a few up to several hundred GHz. My talk will focus on the instrument side, but always keep an eye on the physical systems we envision to probe. A natural question which arises is about the image formation on the nanometer scale in such an instrument. Our approach focuses on two different probe technologies, a microstrip coupled metallic tip and a waveguide coupled dielectric tip. We will show preliminary imaging results in a disordered model system around 3 GHz.