A new class of small low-field magnetoresistance oscillation in unidirectional lateral superlattice

摘要

A new class of small-amplitude magnetoresistance oscillation has been unveiled in unidirectional lateral superlattice (ULSL) samples in a low magnetic field regime dominated by positive magnetoresistance. The oscillation is ascribed to geometric resonance of Bragg-reflected cyclotron orbits. The predicted approximate a–3k dependence of the positions of maxima, where a and kF represent the period and the Fermi wavenumber, respectively, has been confirmed by comparing ULSL samples with a=184 and 207 nm.