Gauge invariant nonlinear electric transport in mesoscopic conductors

@inproceedings{Christen1996GaugeIN,
  title={Gauge invariant nonlinear electric transport in mesoscopic conductors},
  author={Thomas Christen and Markus B{\"u}ttiker},
  year={1996}
}
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… CONTINUE READING