Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 7: (Quantum) Transport Properties
HL 7.7: Vortrag
Montag, 5. September 2022, 17:00–17:15, H31
Temperature and magnetic field-dependent noise measurements in GaAs/AlGaAs quantum rings — •Birkan Düzel1, Olivio Chiatti1, Sven S. Buchholz1, Andreas D. Wieck2, Dirk Reuter3, and Saskia F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 3Optoelektronische Materialien und Bauelemente, Universität Paderborn, 33098 Paderborn, Germany
Nanostructured materials offer a way to investigate phase-coherent transport of electrons and the resulting interference effects in systems. Measurements of the white noise have been used to determine system properties such as the elctron temperature Te. Recently noise measurements in quantum ring structures have revealed white noise exceeding the expected thermal noise [1].
This work investigates the dependence of the excess noise in quantum rings on the bath temperature and applied magnetic field. Noise measurements in AlxGaxAs/GaAs-based etched quantum rings are performed in equlibrium with bath temperatures ranging from 15 mK to 4.2 K and magnetic fields ranging from -50 mT to 50 mT. Additionally, magnetotransport measurements are performed at 1 K with magnetic fields ranging from 0 T to 12 T.
[1] C. Riha et al., Appl. Phys. Lett. 117, 063102 (2020).