Regensburg 2022 – wissenschaftliches Programm

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

HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.89: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Magnetotransport in narrow-gap semiconductors with nanostructured constrictions — •Olivio Chiatti1, Johannes Boy1, Christian Riha1, Christian Heyn2, Wolfgang Hansen2, and Saskia F. Fischer11Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, 20355 Hamburg, Germany

Measurements in magnetic fields are an effective tool to investigate transport properties of low-dimensional electron systems. We investigate the magnetotransport of semiconductor heterostructures and nanostructures with spin-orbit interaction (SOI), under the influence of in-plane and out-of-plane electric fields. The nanostructures are quantum point contacts (QPCs) etched in Hall-bars with in-plane gates. The Hall-bars and the constrictions were defined by micro-laser photolithography and wet-chemical etching from an InGaAs/InAlAs quantum well with an InAs-inserted channel [1]. We have performed transport measurements at low temperatures in the combined QPC and Hall-bar structures in magnetic fields. We can tune the gate-voltages to control the filling-factor mismatch between bulk Hall-bar and QPC. We observe a crossover from reflection to transmission of the quantum Hall edge channels at the QPC and a tunneling across the QPC between reflected edge states, which depends on the magnitude and direction of the in-plane electric field.
 [1] Chiatti et al., Appl. Phys. Lett. 106, 052102 (2015).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2022 > Regensburg