Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: (Quantum) Transport Properties

HL 7.9: Talk

Monday, September 5, 2022, 17:30–17:45, H31

Influence of fixed scatterers of various sizes and densities on the giant negative magnetoresistance in two dimensional electron gases. — •Janus Lammert¹, Beate Horn-Cosfeld¹, Jakob Schluck¹, Mihai Cerchez¹, Thomas Heinzel¹, Klaus Pierz², Hans Werner Schumacher², and Dominique Mailly³ — ¹Institut für Experimentelle Physik der kondensierten Materie, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany — ²Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — ³CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N Marcoussis, 91460 Marcoussis, France

The giant negative magnetoresistance (GNMR) in a 2DEG is studied through the effects produced by artificial scatterers (Lorentz arrays [1]) with varying scatterer density. The influence of the different types and ratios of scattering mechanisms shed light on both the temperature independent and the temperature dependent parts of the GNMR [2]. The effect of scattering on the shape and amplitude of the GNMR will be discussed. [1] H. A. Lorentz, Proc. R. Acad. Sci. Amsterdam 7, 438, 1905, [2] B. Horn-Cosfeld et al. Phys. Rev. B 104, 045306, 2021