DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 46: Poster Tuesday: Plasmonics and Nanooptics

O 46.5: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Extracting the electronic properties of an oxide two-dimensional electron gas by scanning near-field optical microscopy — •Julian Barnett1, Martin Lewin1, Marc Rose2, Felix Gunkel2, Regina Dittmann2, and Thomas Taubner11Institute of Physics (IA), RWTH Aachen — 2Peter Grünberg Institut, Forschungszentrum Jülich GmbH

In the family of functional oxide materials one interesting system is the interface between bulk insulators SrTiO3 and LaAlO3 (LAO/STO), which gives rise to a confined and highly conductive two-dimensional electron gas (2DEG) [1]. This 2DEG exhibits remarkable properties such as superconductivity and gate tunability, while displaying the possibility for future transistor applications. Infrared spectroscopy can be employed for the characterization of 2DEG structural and electronic properties, such as confinement dimensions, carrier density and mobility, but is diffraction-limited in its lateral resolution.
Here, scanning near-field optical microscopy (SNOM) is used to overcome this limitation and obtain nanoscale IR spectra of buried LAO/STO interfaces in the range of the near-field phonon resonance, as the local electronic properties of STO can be quantified by exploiting plasmon-phonon coupling [2]. We will investigate the impact of variations in local topography and interface termination on 2DEG formation to better understand the underlying principles and enable controlled manipulation of its electronic properties.
[1] A. Ohtomo et al., Nature 427, 423 (2004).
[2] M. Lewin et al., Adv. Funct. Mater. 28, 1802834 (2018).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg