An experimental physicist who studied composite fermions using patterned antidot arrays in a two-dimensional electron gas. Near half filling of a Landau level, periodic arrays produced geometric resonances when the effective orbits matched the array spacing; random arrays did not. This comparison tested the orbital picture through a deliberately controlled scattering geometry.[ref]
Composite fermions in periodic and random antidot lattices by J. H. Smet and others. Abstract: periodic versus random arrays and commensurability effects near filling one half
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