Magnetoresistance of antidot lattices with grain boundaries

TL;DR

This study investigates how artificially introduced grain boundaries in antidot lattices affect magnetotransport properties, revealing anisotropic broadening of resonances and semiclassical localization effects, with implications for superlattice transport.

Contribution

It provides the first detailed analysis of grain boundary effects on antidot lattice magnetoresistance, highlighting anisotropic resonance shifts and semiclassical localization mechanisms.

Findings

Grain boundaries broaden and anisotropically displace commensurability resonances.

Semiclassical trajectories tend to localize along grain boundaries.

Transport in superlattices can be significantly influenced by grain boundary structures.

Abstract

The magnetotransport properties of antidot lattices containing artificially designed grain boundaries have been measured. We find that the grain boundaries broaden the commensurability resonances and displace them anisotropically. These phenomena are unexpectedly weak but differ characteristically from isotropic, Gaussian disorder in the antidot positions. The observations are interpreted in terms of semiclassical trajectories which tend to localize along the grain boundaries within certain magnetic field intervals. Furthermore, our results indicate how the transport through superlattices generated by self-organizing templates may get influenced by grain boundaries.