Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 16: Poster Ia
HL 16.17: Poster
Friday, March 4, 2005, 16:30–19:00, Poster TU E
novel type of commensurability oscillations in haxagonal superlattices — •Stefan Meckler1, Thomas Heinzel1, Ulf Gennser2, and Giancarlo Faini2 — 1IPkM, Heinrich-Heine-Universität, Univesitätsstr. 1, 40225 Düsseldorf, Germany — 2LPN-CNRS, Route de Nozay, 91460 Marcoussis, France
Transport experiments on latteral superlattices in two-dimensional electron gases that show pronounced magneto-oscillations are reported. They originate from stable orbits around one or several antidots. In hexagonal lattice structures, we observe a novel type of classical commensurability peaks at high magnetic fields. These peaks are most prominent for large antidot diameters of about 70-90% of the lattice period. Using semiclassical simulations based on a billiard model, the observed oscillations can be attributed to stable orbits bouncing between neighboring antidots. This interpretation is backed by the observation of Aharonov-Bohm type oscillations with a correspondingly large period at the observed resonances.