Effective nonlinear model of resonant tunneling nanostructures

Nonlinear Conductance in Resonant Tunneling.

A multiterminal conductance formula describing resonant tunneling through an interacting mesoscopic system is derived and used to investigate the nonlinear conductance of a quantum dot. An explicit gauge-invariant expression for the I-V characteristic which depends sensitively on the full capacitance matrix is obtained. A voltage probe is found to have a dramatic effect on the nonlinear conduct...

Nonlinear feedback oscillations in resonant tunneling through double barriers.

We analyze the dynamical evolution of the resonant tunneling of an ensemble of electrons through a double barrier in the presence of the self-consistent potential created by the charge accumulation in the well. The intrinsic nonlinearity of the transmission process is shown to lead to oscillations of the stored charge and of the transmitted and reflected fluxes. The dependence on the electrosta...

Nonlinear resonant tunneling through an Anderson impurity at low temperature.

The problem of nonlinear resonant tunneling through an Anderson impurity is investigated in this Letter using a combined approach of Keldysh f'ormalism and 1/iV expansion at zero temperature. We find that to order l/iV, the Kondo resonance is not destroyed by any finite potential difference between external probes. The resulting one-electron Green's functions and differential conductance are pr...

THz resonant-tunneling diodes

Resonant Tunneling throughQuantumDots

Motivated by recent experiments we analyse a new setup of capacitively coupled semiconductor quantum dots. We identify a region where Kondo-assisted tunneling should be observable. We nd an eeective mapping to a single quantum dot with controllable multi-level structure. We study electron transport through strongly coupled quantum dots in the presence of strong Coulomb repulsion and coupling to...