Origin of positive magnetoresistance in small-amplitude unidirectional lateral superlattices

Details Origin of positive magnetoresistance in small-amplitude unidirectional lateral superlattices Origin of positive magnetoresistance in small-amplitude unidirectional lateral superlattices

2005-09-26

arxiv.org/abs/cond-mat/0509635v1

Phys. Rev. B 72, 235303 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 9 figures, REVTeX

Scientific paper

10.1103/PhysRevB.72.235303

We report quantitative analysis of positive magnetoresistance (PMR) for unidirectional-lateral-superlattice samples with relatively small periods (a=92-184 nm) and modulation amplitudes (V_0=0.015-0.25 meV). By comparing observed PMR's with ones calculated using experimentally obtained mobilities, quantum mobilities, and V_0's, it is shown that contribution from streaming orbits (SO) accounts for only small fraction of the total PMR. For small V_0, the limiting magnetic field B_e of SO can be identified as an inflection point of the magnetoresistance trace. The major part of PMR is ascribed to drift velocity arising from incompleted cyclotron orbits obstructed by scatterings.

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