Spin transport in nanocontacts and nanowires (2007)
In this thesis we study electron transport through magnetic nanocontacts and nanowires with ab initio quantum transport calculations. The aim is to gain a thorough understanding of the interplay...
Electronic structure and transport properties of atomic NiO spinvalves (2006)
Jacob, David, Fernández-Rossier, J., Palacios, J. J.
Ab-initio quantum transport calculations show that short NiO chains suspended in Ni nanocontacts present a very strong spin-polarization of the conductance. The generalized gradient approximation we...
Orbital eigenchannel analysis for ab-initio quantum transport calculations (2005)
We show how to extract the orbital contribution to the transport eigenchannels from a first-principles quantum transport calculation in a nanoscopic conductor. This is achieved by calculating and...
Magnetic and orbital blocking in Ni nanocontacts (2004)
Jacob, David, Fernández-Rossier, J., Palacios, J. J.
We address the fundamental question of whether magneto-resistance (MR) of atomic-sized contacts of Nickel is very large because of the formation of a domain wall (DW) at the neck. Using {\em ab...
Isospin Blockade in Transport through Vertical Double Quantum Dots (2004)
Wunsch, Bernhard, Jacob, David, Pfannkuche, Daniela
We study the spectrum and the transport properties of two identical, vertically coupled quantum dots in a perpendicular magnetic field. We find correlation-induced energy crossings in a magnetic...
Charge-localization and isospin-blockade in vertical double quantum dots (2004)
Jacob, David, Wunsch, Bernhard, Pfannkuche, Daniela
Charge localization seems unlikely to occur in two vertically coupled symmetric quantum dots even if a small bias voltage breaks the exact isospin-symmetry of the system. However for a three-electron...
Robustness of vectorial laser systems (1994)
Jacob, David, Cotteverte, Jean-Charles, Le Floch, Albert, Bretenaker, Fabien
The polarisation robustness of vectorial lasers with respect to différent kinds of perturbation is theoretically investigated in thé framework of a Landau potential approach. It is shown that usual...
Robustness of vectorial laser systems (1994)
Jacob, David, Cotteverte, Jean-Charles, Le Floch, Albert, Bretenaker, Fabien
The polarisation robustness of vectorial lasers with respect to différent kinds of perturbation is theoretically investigated in thé framework of a Landau potential approach. It is shown that usual...