Low temperature near-field fingerprint spectroscopy of 2D electron systems in oxide heterostructures and beyond
Confined electron systems, such as 2D electron gases (2DEGs), 2D materials, or topological insulators, show great technological promise but their susceptibility to defects often results in nanoscale inhomogeneities with unclear origins. Here, led by the team of Thomas Taubner (RWTH Aachen), we applied scattering-type scanning near-field optical microscopy (s-SNOM) to investigate a buried and confined electron systems non-destructively with nanoscale resolution. We reveal a characteristic “fingerprint” response of the prototypical LaAlO3/SrTiO3 2DEG allowing to extract dielectric and electronic properties of the electronic system with nanometer lateral resolution.
Julian Barnett, Konstantin G. Wirth, Richard Hentrich, Yasin C. Durmaz, Marc-André Rose, Felix Gunkel & Thomas Taubner Nature Communications volume 16, Article number: 4417 (2025) https://doi.org/10.1038/s41467-025-59633-1
Published: 13 May 2025
Contact
Dr. Felix Gunkel
Senior Researcher / Group leader Associate Professor, University of Twente (IMS)
- Peter Grünberg Institute (PGI)
- Electronic Materials (PGI-7)
Room 51