Gauge invariant nonlinear electric transport in mesoscopic conductors

Details Gauge invariant nonlinear electric transport in mesoscopic conductors Gauge invariant nonlinear electric transport in mesoscopic conductors

1996-04-04

arxiv.org/abs/cond-mat/9604029v2

Europhys. Lett. 35 523 (1996)

Physics

Condensed Matter

(Replaced version, with corrected Eq.(4)); 5 pages, RevTeX, 1 figure, uuencoded

Scientific paper

10.1209/epl/i1996-00145-8

We use the scattering approach to investigate the nonlinear current-voltage characteristic of mesoscopic conductors. We discuss the leading nonlinearity by taking into account the self-consistent nonequilibrium potential. We emphasize conservation of the overall charge and current which are connected to the invariance under a global voltage shift (gauge invariance). As examples, we discuss the rectification coefficient of a quantum point contact and the nonlinear current-voltage characteristic of a resonant level in a double barrier structure.

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