Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 79: Poster: New Materials

HL 79.28: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG3

Magnetotransport experiments on Lorentz systems with varying scatterer shape — •Tabea Heckenthaler — Heinrich-Heine-Universität Düsseldorf

In the Lorentz model one usually assumes an array of randomly distributed hard disks to model scattering in solids. This has hitherto been discussed primarily from a theoretical point of view.

Due to advancements in semiconductor processing, one can nowadays realize systems with desired specifications in order to also study them experimentally.

We examine such samples based on high electron mobility Ga[Al]As heterostructures, where holes of varying shape are introduced via Ar - ion etching. The scattering at the artificial obstacles dominates the magnetoresistance at low magnetic fields, since background scattering is minimized. We show that these effects have a classical character, which is plausible due to the scatterer size in comparison to the Fermi wavelength.

In addition to the shape we vary the size and density of scatterers and study the effect on magnetoresistance at low temperatures.