Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 79: Poster: New Materials

HL 79.31: Poster

Thursday, March 23, 2017, 15:00–19:00, P2-OG3

Experimental study of Memory effects in Lorentz Gases — •Matthias Hund¹, Jakob Schluck¹, Thomas Heinzel¹, Klaus Pierz², and Hans W. Schumacher² — ¹Heinrich-Heine Universität — ²PTB Braunschweig

The classical Lorentz model is a fundamental class of systems to study transport properties in disordered media. It consists of non-interacting point particles that move through randomly placed static scatterers with short range forces. For such systems, extensive predictions exist for the low density regime, while studies related to large scatterer densities are rare. Resistivity contributions due to scattering correlations are called memory effects. They are expected to modify in particular the magnetoresistivity. Here, we report magnetotransport measurements of Lorentz gases defined with various scatterer densities in high electron mobility GaAs/Ga_xAl_1−xAs and show that the systems have a characteristic magnetoresistivity which can be attributed to different types of memory contributions.