Magnetic-field asymmetry of nonlinear mesoscopic transport

Details Magnetic-field asymmetry of nonlinear mesoscopic transport Magnetic-field asymmetry of nonlinear mesoscopic transport

2004-04-16

arxiv.org/abs/cond-mat/0404387v3

Phys. Rev. Lett. 93, 106802 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures. Published version

Scientific paper

10.1103/PhysRevLett.93.106802

We investigate departures of the Onsager relations in the nonlinear regime of electronic transport through mesoscopic systems. We show that the nonlinear current--voltage characteristic is not an even function of the magnetic field due only to the magnetic-field dependence of the screening potential within the conductor. We illustrate this result for two types of conductors: A quantum Hall bar with an antidot and a chaotic cavity connected to quantum point contacts. For the chaotic cavity we obtain through random matrix theory an asymmetry in the fluctuations of the nonlinear conductance that vanishes rapidly with the size of the contacts.

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