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

摘要

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