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We have uncovered a new class of small amplitude magnetoresistanceoscillation in unidirectional lateral superlattice (ULSL). The oscillation isobserved in a low-field regime, typically |B| =< 0.03 T, as small undulation ontop of well-known positive magnetoresistance background. Positions of maxima ofthe oscillation shift to lower field side with the increase of the electronconcentration n_e roughly proportionally to n_e^{-1/2}, and also with theincrease of period a of ULSL samples. The oscillation is attributed tocommensurability between the period a and the width of open orbits originatingfrom the miniband structure.Comment: REVTeX4, 5 pages, 5 figure

physical review. b, condensed matter and materials physics

Small amplitude low-field magnetoresistance oscillation in unidirectional lateral superlattices: Geometric resonance of Bragg-reflected cyclotron orbits