Origin of positive magnetoresistance in small-amplitude unidirectional lateral superlattices
arXiv:cond-mat/0509635 · doi:10.1103/PhysRevB.72.235303
Abstract
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.
12 pages, 9 figures, REVTeX
References in corpus (10)
- Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder
- Interaction-induced magnetoresistance in a two-dimensional electron gas
- Interaction-induced magnetoresistance: From the diffusive to the ballistic regime
- Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime
- Anomalous Low-Field Classical Magnetoresistance in Two Dimensions
- Harmonic Content of Strain-induced Potential Modulation in Unidirectional Lateral Superlattices
- New class of small amplitude low-field magnetoresistance oscillation in unidirectional lateral superlattice: Geometric resonance of Bragg-reflected cyclotron orbit
- Anisotropic transport in unidirectional lateral superlattice around half-filling of the second Landau level
- Magnetotransport in lateral superlattices with small-angle impurity scattering: Low-field magnetoresistance
- Dependence of Modulation Amplitude on Electron Density in Unidirectional Lateral Superlattices: The Effect of the Thickness of the Two-dimensional Electron Gas
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