Selective probing of ballistic electron orbits in rectangular antidot lattices

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Abstract
Rectangular antidot lattices have been fabricated by holographic lithography and subsequent low-energy ion irradiation. The magnetoresistance depends on the direction of current flow and reveals pronounced low-field maxima that are related to ballistic electron orbits around groups of antidots. For current flow along the long period of the lattice, ballistic electron orbits around a few antidots are probed preferentially. Transport along the short period of the lattice is dominated by trajectories around many antidots. The Hall resistance is independent of the direction of current flow in agreement with symmetry arguments.