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Abstract: Using a semiclassical Boltzmann equation, we calculate corrections to theSharvin conductance of a wide 2DEG ballistic contact that result from anelectron-electron scattering in the leads. These corrections are dominated bycollisions of electrons with nearly opposite momenta that come from differentreservoirs. They are positive, increase with temperature, and are stronglysuppressed by a magnetic field. We argue that this suppression may beresponsible for an anomalous positive magnetoresistance observed in a recentexperiment.



Autor: K. E. Nagaev, T. V. Kostyuchenko

Fuente: https://arxiv.org/







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