Lee, Minchul, Choi, Mahn-Soo, Lopez, Rosa, Aguado, Ramon, Martinek, Jan, Zitko, Rok
We study a series-coupled double quantum dot in the Kondo regime modeled by the two-impurity Anderson model and find a new conduction-band mediated superexchange interaction that competes with Kondo...
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...
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...
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...
Pair Tunneling and shot noise through a single molecule in a strong electron-phonon coupling (2006)
Hwang, Myung-Joong, Choi, Mahn-Soo, Lopez, Rosa
We investigate the electronic transport through a single molecule in a strong electron-phonon coupling regime. Based on a particle-hole transformation which is made suitable for non-equilibrium...
Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry (2006)
Lim, Jong Soo, Choi, Mahn-Soo, Choi, M. Y., Lopez, Rosa, Aguado, Ramon
We study the Kondo effect in a single-electron transistor device realized in a single-wall carbon nanotube. The K-K' double orbital degeneracy of a nanotube, which originates from the peculiar...
Mesoscopic Charge Relaxation (2006)
Nigg, Simon E., Lopez, Rosa, Buttiker, Markus
We consider charge relaxation in the mesoscopic equivalent of an RC circuit. For a single-channel, spin-polarized contact, self-consistent scattering theory predicts a universal charge relaxation...
Josephson current through a Kondo molecule (2006)
Lopez, Rosa, Choi, Manh-Soo, Aguado, Ramon
We investigate transport of Cooper pairs through a double quantum dot (DQD) in the Kondo regime and coupled to superconducting leads. Within the non-perturbative slave boson mean-field theory 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...
SU(4) Kondo Effect in Carbon Nanotubes (2004)
Choi, Mahn-Soo, Lopez, Rosa, Aguado, Ramon
We investigate theoretically the non-equilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the...
RKKY and magnetic field interactions in coupled Kondo quantum dots (2004)
Simon, Pascal, Lopez, Rosa, Oreg, Yuval
We investigate theoretically the transport properties of two independent artificial Kondo impurities. They are coupled together via a tunable Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction. For...
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...
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...
Low temperature transport in AC-driven Quantum Dots in the Kondo regime (2000)
Lopez, Rosa, Aguado, Ramon, Platero, Gloria, Tejedor, Carlos
We present a fully nonequilibrium calculation of the low temperature transport properties of a quantum dot in the Kondo regime when an AC potential is applied to the gate voltage. We solve a time...
Kondo effect in AC transport through Quantum dots (1998)
Lopez, Rosa, Aguado, Ramon, Platero, Gloria, Tejedor, Carlos
A theory of the Kondo effect in quantum dots at zero temperature in the presence of arbitrary intense AC potentials is presented.We generalize the Friedel-Langreth sum rule to take care of charge...