We consider the influence of the electron-electron interaction on the non-linearity of the current-voltage characteristic of the tunnel junction at low bias (diffusive anomaly) in the presence of the classical magnetic field. We present the theory of a new phenomenon which manifests itself in the strong anisotropy of a diffusive anomaly for different orientations of the magnetic field with resp...

We investigate a one-dimensional electron liquid with two point scatterers of different strength. In the presence of electron interactions, the nonlinear conductance is shown to depend on the current direction. The resulting asymmetry of the transport characteristic gives rise to a ratchet effect, i.e., the rectification of a dc current for an applied ac voltage. In the case of strong repulsive...

In this paper, electrical investigations performed on complex metal–oxide–semiconductor (MOS) structures with amorphous LaAlO3 deposited as gate oxide on a rapid thermal processed SiO2 buffer layer are presented. Current–voltage (I–V) measurements at different temperatures and high frequency room-temperature capacitance–voltage (C–V) measurements indicate the presence of a non-equilibrium state...

We investigate the effect of a scanning gate tip on the nonlinear quantum transport properties of nanostructures. Generally, we predict that the symmetry of the current-voltage characteristic in reflection-symmetric samples is broken by a tip-induced rectifying conductance correction. Moreover, in the case of a quantum point contact (QPC), the tip-induced rectification term becomes dominant as ...

Abstract : In this paper, a novel on-line capacitance estimation of dc link capacitor using input current injection is proposed for the ac/dc PWM converters. At no load, a controlled input current at a lower frequency than the line frequency is injected into the input side, which causes the dc voltage ripples at the output side. With the ac voltage and current ripple components on the dc side e...

We present gallium antimonide (GaSb) p–i–n photodiodes for use as thermophotovoltaic (TPV) cells grown on gallium arsenide (100) substrates using the interfacial misfit array method. Devices were grown using molecular beam epitaxy and fabricated using standard microfabrication processes. X-ray diffraction was used to measure the strain, and current–voltage (I–V) tests were performed to determin...

In order to describe frequency-dependent quantum transport properties, it is necessary to take into account local fields. However, since the microscopic charge and current distributions are rapidly varying functions of space and time the solution of Maxwell’s equations is a complex task. Especially in the presence of non–linear effects, a selfconsistent theory of frequency and time dependent tr...

Measuring the current-voltage characteristic of organic bulk heterojunction solar devices sometimes reveals an S-shaped deformation. We qualitatively produce this behavior by a numerical device simulation assuming a reduced surface recombination. Furthermore we show how to experimentally create these double diodes by applying an oxygen plasma etch on the indium-tin-oxide anode. Restricted charg...

In order to investigate photoinduced insulator-metal transitions observed in correlated electron systems, we propose a new theoretical method, where we combine a Floquetmatrix method for AC-driven systems with the dynamical mean-field theory. The method can treat nonequilibrium steady states exactly beyond the linear-response regime. We have applied the method to the Falicov-Kimball model coupl...

We develop a theory of nonlinear response to an electric field of a two-dimensional electron gas 2DEG placed in a classically strong magnetic field. The latter leads to a nonlinear current-voltage characteristic at a relatively weak electric field. The origin of the nonlinearity is twofold: the formation of a nonequilibrium electron distribution function and the geometrical resonance in the int...