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...
Mn-doped II-VI quantum dots: artificial molecular magnets (2007)
Fernandez-Rossier, J., Aguado, Ramon
The notion of artifical atom relies on the capability to change the number of carriers one by one in semiconductor quantum dots, and the resulting changes in their electronic structure. Organic...
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...
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...
Many-body effects and quantum coherence in electron transport through quantum dots (2005)
In this paper, I briefly review some recent aspects of electron transport through lateral quantum dots in the few-electron regime. These systems are very useful in studying a wide range of...
Many-body effects and quantum coherence in electron transport through quantum dots (2005)
In this paper, I briefly review some recent aspects of electron transport through lateral quantum dots in the few-electron regime. These systems are very useful in studying a wide range of...
AC-driven double quantum dots as spin pumps and spin filters (2005)
Cota, Ernesto, Aguado, Ramon, Platero, Gloria
We propose and analyze a new scheme of realizing both spin filtering and spin pumping by using ac-driven double quantum dots in the Coulomb blockade regime. By calculating the current through the...
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...
Photon-assisted transport in semiconductor nanostructures (2003)
Platero, Gloria, Aguado, Ramon
In this review we focus on electronic transport through semiconductor nanostructures which are driven by ac fields. Along the review we describe the available experimental information on different...
Kondo effect in coupled quantum dots: a Non-crossing approximation study (2002)
Aguado, Ramon, Langreth, David C.
The out-of-equilibrium transport properties of a double quantum dot system in the Kondo regime are studied theoretically by means of a two-impurity Anderson Hamiltonian with inter-impurity hopping....
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...
Out-of-equilibrium Kondo effect in Double Quantum Dots (1999)
Aguado, Ramon, Langreth, David C.
The out-of-equilibrium transport properties of a double quantum dot system in the Kondo regime are studied theoretically by means of a two-impurity Anderson hamiltonian with interimpurity hopping....
Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors (1999)
Aguado, Ramon, Kouwenhoven, Leo P.
We propose a measurement set-up for detecting quantum noise over a wide frequency range using inelastic transitions in a tunable two-level system as a detector. The frequency-resolving detector...
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....
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...
Microscopic Model for Sequential Tunneling in Semiconductor Multiple Quantum Wells (1997)
Aguado, Ramon, Platero, Gloria, Moscoso, Miguel, Bonilla, Luis L.
We propose a selfconsistent microscopic model of vertical sequential tunneling through a multi-quantum well.The model includes a detailed description of the contacts,uses the Transfer Hamiltonian for...
Electron-Photon interaction in resonant tunneling diodes (1997)
Inarrea, Jesus, Aguado, Ramon, Platero, Gloria
We develope a model to describe the transmission coefficient and tunneling current in the presence of photon-electron coupling in a resonant diode. Our model takes into account multiphoton processes...
Dynamical Localization and Absolute Negative Conductance in an ac driven double quantum well (1996)
Aguado, Ramon, Platero, Gloria
We analyze the I-V characteristic of a double quantum well integrated in an antenna and driven by THz radiation.We propose a microscopic model to calculate the sequential current including...