Commensurability Effects in Hexagonal Antidot Lattices with Large Antidot Diameters

Details Commensurability Effects in Hexagonal Antidot Lattices with Large Antidot Diameters Commensurability Effects in Hexagonal Antidot Lattices with Large Antidot Diameters

2005-02-09

arxiv.org/abs/cond-mat/0502237v2

Phys. Rev. B 72, 035319 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures minor changes to text

Scientific paper

10.1103/PhysRevB.72.035319

The observation of a novel type of commensurability resonance in two-dimensional, hexagonal antidot lattices is reported. These resonances have a classical character and occur at magnetic fields above the resonance that corresponds to the cyclotron motion around a single antidot. The resonances are visible only for antidots with effective diameters larger than 50 % of the lattice constant. Simulations reveal that they originate from quasi-stable electron trajectories that bounce between three neighboring antidots. This interpretation is backed by the observation of large-period Aharonov-Bohm type oscillations at low temperatures.

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