Using the recently developed time-dependent Landauer-B\"uttiker formalism and Jefimenko's retarded solutions to Maxwell equations, we show how compute electromagnetic field produced by charge current densities in nanojunctions out of equilibrium. We then apply this a benzene ring junction that geometry-dependent quantum interference effects can be used control magnetic vicinity molecule. Then, ...

The Landauer-Büttiker formalism combined with the tight-binding transfer matrix method is used to describe the results of recent experiments: the high tunneling magnetoresistance (TMR) in (Ga,Mn)As-based trilayers and highly polarized spin injection in p-(Ga,Mn)As/n-GaAs Zener diode. For both TMR and Zener spin current polarization, the calculated values agree well with those observed experimen...

When combining lumped mesoscopic electronic components to form a circuit, quantum fluctuations of electrical quantities lead to a nonlinear electromagnetic interaction between the components, which is generally not understood. The Landauer-Büttiker formalism that is frequently used to describe noninteracting coherent mesoscopic components is not directly suited to describe such circuits since i...

Final Summary and Conclusions 96 List of publications, pre-prints and works in progress 98 Acknowledgements 99 2 Edge states are 1-dimensional transport channels, emerging in quantum wells in the integer Quantum Hall regime, with remarkable properties of chirality and quantum coherence. In this thesis we present the idea of manipulating electronic currents mixed over two co-propagating edge cha...

Electronic and transport properties of bilayer heterostructure under light irradiation are fundamental interest to improve functionality optoelectronic devices. We theoretically study the modification graphene heterostructures a time-periodic external field. The bulk electronic studied in Landauer-type configuration by using nonequilibrium Green's function formalism. To illustrate behavior diff...

A local–orbital based ab initio approach to obtain the Green function for large heterogeneous systems is developed. First a Green function formalism is introduced based on exact diagonalization. Then the self energy is constructed from an incremental scheme, rendering the procedure feasible, while at the same time physical insight into different local correlation contributions is obtained. Subs...

List of publications, pre-prints and works in progress 91 Acknowledgements 93 2 Summary / Résumé Edge states are 1-dimensional transport channels, emerging in quantum wells in the integer Quantum Hall regime, with remarkable properties of chirality and quantum coherence. In this thesis we present the idea of manipulating electronic currents mixed over two co-propagating edge channels, and discu...

Owing to their atomic-level perfection, carbon nanotubes exhibit unusually high electrical and thermal conductivity. Our electrical transport calculations, performed using a scattering technique based on the Landauer-Biittiker formalism, suggest that the conductance of inhomogeneous multi-wall nanotubes may show an unusual fractional quantization behavior, in agreement with recent experimental ...