Congestion in a macroscopic model of self-driven particles modeling gregariousness (2009)
Degond, Pierre, Navoret, Laurent, Bon, Richard, Sanchez, David
We analyze a macroscopic model with a maximal density constraint which describes short range repulsion in biological systems. This system aims at modeling finite-size particles which cannot overlap...
Localized magnetic states in Rashba dots (2009)
Crisan, Mircea, Sanchez, David, Lopez, Rosa, Serra, Llorens, Grosu, Ioan
We study the formation of local moments in quantum dots arising in quasi-one dimensional electron wires due to localized spin-orbit (Rashba) interaction. Using an Anderson-like model to describe the...
Congestion in a macroscopic model of self-driven particles modeling gregariousness (2009)
Degond, Pierre, Navoret, Laurent, Bon, Richard, Sanchez, David
We analyze a macroscopic model with a maximal density constraint which describes short range repulsion in biological systems. This system aims at modeling finite-size particles which cannot overlap...
Congestion in a macroscopic model of self-driven particles modeling gregariousness (2009)
Degond, Pierre, Navoret, Laurent, Bon, Richard, Sanchez, David
We analyze a macroscopic model with a maximal density constraint which describes short range repulsion in biological systems. This system aims at modeling finite-size particles which cannot overlap...
Magnetoasymmetric current fluctuations of single-electron tunneling (2008)
We determine the shot noise asymmetry of a quantum dot under reversal of an external magnetic field. The dot is coupled to edge states which invert their chirality when the field is reversed, leading...
G. Donald Allen, Jim Herod, Mark Holmes, Vince Ervin, Robert J. Lopez, Joe Marlin, ...
In this note, the authors attempt to set out parameters for the usage of a Computer Algebra System in the classroom. These results are based on the common experiences of several faculty that have...
We investigate magnetic-field asymmetries in the linear transport of a mesoscopic conductor interacting with its environment. Interestingly, we find that the interaction between the two systems...
Strongly modulated transmission of a spin-split quantum wire with local Rashba interaction (2007)
Sanchez, David, Serra, Llorens, Choi, Mahn-Soo
We investigate the transport properties of ballistic quantum wires in the presence of Zeeman spin splittings and a spatially inhomogeneous Rashba interaction. The Zeeman interaction is extended along...
Evanescent states in quantum wires with Rashba spin-orbit coupling (2007)
Serra, Llorens, Sanchez, David, Lopez, Rosa
We discuss the calculation of evanescent states in quasi-one-dimensional quantum wires in the presence of Rashba spin-orbit interaction. We suggest a computational algorithm devised for cases in...
Spin-polarized transport in II-VI magnetic resonant tunneling devices (2007)
Sanchez, David, Gould, Charles, Schmidt, Georg, Molenkamp, Laurens W.
We investigate electronic transport through II-VI semiconductor resonant tunneling structures containing diluted magnetic impurities. Due to the exchange interaction between the conduction electrons...
From Coulomb blockade to the Kondo regime in a Rashba dot (2006)
Lopez, Rosa, Sanchez, David, Serra, Llorens
We investigate the electronic transport in a quantum wire with localized Rashba interaction. The Rashba field forms quasi-bound states which couple to the continuum states with an opposite spin...
Serra, Llorens, Sanchez, David
We analyze the linear conductance of a semiconductor quantum wire containing a region where a local Rashba spin-orbit interaction is present. We show that Fano lineshapes appear in the conductance...
Fano-Rashba effect in a quantum wire (2006)
Sanchez, David, Serra, Llorens
We predict the occurrence of Fano lineshapes in a semiconductor quantum wire with local spin-orbit (Rashba) coupling. We show that the Rashba interaction acts in a strictly one dimensional channel as...
Chirality in Coulomb-blockaded quantum dots (2005)
Sanchez, David, Buttiker, Markus
We investigate the two-terminal nonlinear conductance of a Coulomb-blockaded quantum dot attached to chiral edge states. Reversal of the applied magnetic field inverts the system chirality and leads...
Interaction induced magnetic field asymmetry of nonlinear mesoscopic electrical transport (2005)
Buttiker, Markus, Sanchez, David
We demonstrate that the nonlinear I-V characteristics of a two probe conductor is not an even function of magnetic field. While the conductance of a two-probe conductor is even in magnetic field, we...
Rashba interaction in quantum wires with in-plane magnetic fields (2005)
Serra, Llorens, Sanchez, David, Lopez, Rosa
We analyze the spectral and transport properties of ballistic quasi one-dimensional systems in the presence of spin-orbit coupling and in-plane agnetic fields. Our results demonstrate that Rashba...
Spintronic transport and Kondo effect in quantum dots (2005)
Sanchez, David, Lopez, Rosa, Choi, Mahn-Soo
We investigate the spin-dependent transport properties of quantum-dot based structures where Kondo correlations dominate the electronic dynamics. The coupling to ferromagnetic leads with parallel...
Magnetic-field asymmetry of nonlinear mesoscopic transport (2004)
Sanchez, David, Buttiker, Markus
We investigate departures of the Onsager relations in the nonlinear regime of electronic transport through mesoscopic systems. We show that the nonlinear current--voltage characteristic is not an...
We investigate the nonequilibrium transport properties of a three-terminal quantum dot in the strongly interacting limit. At low temperatures, a Kondo resonance arises from the antiferromagnetic...
Probing spin and orbital Kondo effects with a mesoscopic interferometer (2004)
Lopez, Rosa, Sanchez, David, Lee, Minchul, Choi, Mahn-Soo, Simon, Pascal, Hur, Karyn Le
We investigate theoretically the transport properties of a closed Aharonov-Bohm interferometer containing two quantum dots in the strong coupling regime. We find two distinct physical scenarios...
Andreev drag effect in ferromagnetic-normal-superconducting systems (2003)
Sanchez, David, Lopez, Rosa, Samuelsson, Peter, Buttiker, Markus
We investigate conductances and current correlations in a system consisting of a normal multichannel conductor connected to one superconducting and two ferromagnetic electrodes. For antiparallel...
Choi, Mahn-Soo, Sanchez, David, Lopez, Rosa
We investigate the effects of spin-polarized leads on the Kondo physics of a quantum dot using the numerical renormalization group method. Our study demonstrates in an unambiguous way that the Kondo...
We investigate the nonequilibrum transport properties of a quantum dot when spin flip processes compete with the formation of a Kondo resonance in the presence of ferromagnetic leads. Based upon the...
Spin-polarized current oscillations in diluted magnetic semiconductor multiple quantum wells (2002)
Bejar, Manuel, Sanchez, David, Platero, Gloria, MacDonald, A. H.
We study the spin and charge dynamics of electrons in n-doped II--VI semiconductor multiple quantum wells when one or more quantum wells are doped with Mn. The interplay between strongly nonlinear...
Field-domain spintronics in magnetic semiconductor multiple quantum wells (2001)
Sanchez, David, MacDonald, A. H., Platero, Gloria
We develop a theory of non-linear growth direction transport in magnetically doped II-VI compound semiconductor multiple-quantum-well systems. We find that the formation of electric field domains can...
Photoassisted dynamical transport in multiple quantum wells (2001)
Lopez, Rosa, Sanchez, David, Platero, Gloria
We study the dynamical transport in weakly coupled superlattices in the presence of intense radiation in the THz regime. We derive a general model for the time dependent tunneling current within the...
Sanchez, David, Bonilla, L. L., Platero, G.
We examine how the current--voltage characteristics of a doped weakly coupled superlattice depends on temperature. The drift velocity of a discrete drift model of sequential tunneling in a doped...
Canted phase in double quantum dots (2001)
Sanchez, David, Brey, L., Platero, Gloria
We perform a Hartree-Fock calculation in order to describe the ground state of a vertical double quantum dot in the absence of magnetic fields parallel to the growth direction. Intra- and interdot...
Sanchez, David, Moscoso, Miguel, Bonilla, Luis L., Platero, Gloria, Aguado, Ramon
Self-sustained current oscillations in weakly-coupled superlattices are studied by means of a self-consistent microscopic model of sequential tunneling including boundary conditions naturally....
ERKENNEN UND LOKALISIEREN VON POLYEDERN IM 3-D RAUM (1992)
Das Problem des Erkennens von Polyedern im 3-D Raum wird formuliert, eine Loesung dazu wird erarbeitet, und ein moegliches Erkennungsmodul wird mit einem frueher vorgestellten Lokalisierungsmodul...
The State of the Art of Robot Learning Control Using Artificial Neural Networks - An Overview (1992)
This article examines state-of-the-art learning control schemes, particularly in applications for robot control systems, based on artificial neural network architectures with supervised and...