M. Governale

Learn More
We study a quantum network extending in one dimension (chain of square loops connected at one vertex) made up of quantum wires with Rashba spin-orbit coupling. We show that the Rashba effect may give rise to an electron localization phenomenon similar to the one induced by magnetic field. This localization effect can be attributed to the spin precession due(More)
Dario Bercioux,1,2 Michele Governale,3 Vittorio Cataudella,2 and Vincenzo Marigliano Ramaglia2 1Institut für Theoretische Physik, Universität Regensburg, D-93040, Germany 2Coherentia-INFM and Dipartimento di Scienze Fisiche, Università degli Studi “Federico II,” I-80126 Napoli, Italy 3NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126(More)
We have investigated the behavior of bistable cells made up of four quantum dots and occupied by two electrons, in the presence of realistic confinement potentials produced by depletion gates on top of a GaAs/AlGaAs heterostructure. Such a cell represents the basic building block for logic architectures based on the concept of quantum cellular automata(More)
We present a theory of transport through interacting quantum dots coupled to normal and superconducting leads in the limit of weak tunnel coupling. A Josephson current between two superconducting leads, carried by first-order tunnel processes, can be established by non-equilibrium proximity effect. Both Andreev and Josephson current is suppressed for bias(More)
– We study spin precession due to Rashba spin splitting of electrons and holes in semiconductor quantum wells. Based on a simple analytical expression that we derive for the current modulation in a broad class of experimental situations of ferromagnet/nonmagnetic semiconductor/ferromagnet hybrid structures, we conclude that the Datta-Das spin transistor (i)(More)
Jens Schulenborg, Janine Splettstoesser, Michele Governale, and L. Debora Contreras-Pulido Institut für Theorie der Statistischen Physik, RWTH Aachen University, D-52056 Aachen, & JARA Future Information Technologies, Germany Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-41298 Göteborg, Sweden School of Physical(More)
We present results on the effects of spin-orbit coupling on the electronic structure of few-electron interacting quantum dots. The ground-state properties as a function of the number of electrons in the dot N are calculated by means of spin-density functional theory. We find a suppression of Hund's rule due to the competition of the Rashba effect and(More)
We have studied the waiting time distributions (WTDs) for subgap transport through a single-level quantum-dot tunnel coupled to one normal and one superconducting lead. The WTDs reveal the internal dynamics of the system, in particular, the coherent transfer of Cooper pairs between the dot and the superconductor. The WTDs exhibit oscillations that can be(More)