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From antidot to dot superlattices: Magnetoresistance anomalies

Rotter, Peter ; Hennig, Ralf ; Suhrke, Michael ; Rössler, Ulrich
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Date of publication of this fulltext: 05 Aug 2009 13:28


Abstract

For low Fermi energies and large antidot diameters an antidot superlattice changes into a dot superlattice. A negative magnetoresistance (NMR) for low magnetic fields coexisting with a commensurability peak is observed in this transition regime. We reproduce these features for both classical and quantum-mechanical calculations in a model, which traces the NMR back to saddle points with varying heights between the antidots.


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