Electron-electron scattering and magnetoresistance of ballistic microcontacts

Details Electron-electron scattering and magnetoresistance of ballistic microcontacts Electron-electron scattering and magnetoresistance of ballistic microcontacts

2009-09-18

arxiv.org/abs/0909.3497v2

Phys. Rev. B 81, 125316 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures, published version

Scientific paper

Using a semiclassical Boltzmann equation, we calculate corrections to the Sharvin conductance of a wide 2DEG ballistic contact that result from an electron--electron scattering in the leads. These corrections are dominated by collisions of electrons with nearly opposite momenta that come from different reservoirs. They are positive, increase with temperature, and are strongly suppressed by a magnetic field. We argue that this suppression may be responsible for an anomalous positive magnetoresistance observed in a recent experiment.

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