Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 106: Transport, magnetotransport and quantum Hall physics
HL 106.3: Talk
Friday, March 20, 2015, 10:30–10:45, EW 202
Snake orbit commensurability resonances in magneto-electric lateral superlattices — •Jakob Schluck1, Stefan Fasbender1, Thomas Heinzel1, Dimitris Kazazis2, Ulf Gennser2, Klaus Pierz3, and Hans Schumacher3 — 1Heinrich Heine Universität Düsseldorf — 2CNRS-LPN, Marcoussis — 3PTB Braunschweig
Hybrid lateral superlattices composed of a square array of antidots and a periodic magnetic modulation in one dimension are prepared in Ga[Al]As heterostructures. The two-dimensional electron gases exposed to these superlattices are characterized by magnetotransport experiments. The longitudinal magnetoresistivity ρxx, parallel to the magnetic modulation, shows pronounced resonances that originate from snake orbits that become commensurate with the antidot lattice for characteristic magnetic field amplitudes. The resistivity ρyy in the direction perpendicular to the magnetic modulation is governed by the magnetic barriers in series and shows weak antidot-induced modulations. Numerical simulations based on the classical Kubo model reproduce the most prominent features of the experimental data.