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HL: Fachverband Halbleiterphysik

HL 42: Transport

HL 42.6: Vortrag

Donnerstag, 15. März 2018, 16:15–16:30, EW 015

Semiclassical origin of quantum oscillations in high-mobility electrostatic superlattices — •Jakob Schluck¹, Juraj Feilhauer², Klaus Pierz², Hans Schumacher², and Thomas Heinzel¹ — ¹Universität Düsseldorf — ²PTB Braunschweig

Semiconductor superlattices have long been a testground for the validity of semiclassical descriptions of electronic transport. Here we present experimental results of magnetotransport measurements on two-dimensional electrostatic superlattices prepared in high-mobility GaAlAs heterostructures. Superimposed on the classical commensurability resonances we find quantum oscillations, exhibiting an irregular behavior with respect to the quantum Hall transitions. Their semiclassical origin is discussed with the help of numerical simulations based on the Kwant package [1]. We propose an explanation based on the coexistence of skipping and hopping transport.

[1]: C.W. Groth et al., New Journal of Physics 16 063065 (2014)