Higher order terms in the geometric resonance of open orbits in unidirectional lateral superlattices

TL;DR

This paper investigates high-resolution geometric resonance phenomena in open orbits within unidirectional lateral superlattices, revealing small-amplitude, high-order resonances superimposed on positive magnetoresistance, advancing understanding of electron dynamics in such structures.

Contribution

It introduces the observation and analysis of higher order geometric resonances in open orbits, providing new insights into magnetoresistance oscillations in lateral superlattices.

Findings

Detection of magnetoresistance oscillations periodic in 1/B

Oscillations are smaller in magnitude and magnetic-field scale

Resonances interpreted as higher order geometric resonances

Abstract

The geometric resonance of open orbits in unidirectional lateral superlattices has been examined with high magnetic-field resolution. Magnetoresistance oscillations periodic in 1/B, analogous to the well-known commensurability oscillations but orders of magnitude smaller both in magnitude and in the magnetic-field scale, have been observed superposed on the low-field positive magnetoresistance. The periodicity in 1/B can be interpreted in terms of higher order resonances.