Gustavo A. Lara

Kondo effect and bistability in a double quantum dot

We study theoretically the out-of-equilibrium transport properties of a double quantum dot system in the Kondo regime. We model the system by means of a two-impurity Anderson Hamiltonian. The transport properties are characterized by Kondo effect properties, however, superimposed on them, and the system possesses nonlinear bistability behavior.

Kondo and Dicke effect in quantum dots side coupled to a quantum wire

Electron tunneling through quantum dots side coupled to a quantum wire, in equilibrium and nonequilibrium Kondo regime, is studied. The mean-field finite-

Negative differential conductance induced by electronic correlation in a double quantum dot molecule

U

Kondo effect in side coupled double quantum-dot molecule

slave-boson formalism is used to obtain the solution of the problem. We have found that the transmission spectrum shows a structure with two antiresonances localized at the renormalized energies of the quantum dots. The density of states (DOS) of the system shows that when the Kondo correlations are dominant there are two Kondo regimes with its own Kondo temperature. The above behavior of the DOS can be explained by quantum interference in the transmission through the two different resonance states of the quantum dots coupled to common leads. This result is analogous to the Dicke effect in optics. We investigate the many-body Kondo states as a function of the parameters of the system.

Tristability in a non-equilibrium double-quantum-dot in the Kondo regime

Electron tunneling through a two stage Kondo system constituted by a double quantum-dot molecule side coupled to a quantum wire, under the effect of a finite external potential is studied. We found that

Electronic transport through two double quantum dot molecules embedded in an Aharonov-Bohm ring

I

Kondo effect in a double quantum-dot molecule under the effect of an electric and magnetic field

-

Kondo and Fano Effect in Side Attached Double Quantum-Dot Molecule

V

Kondo effect and tristability in a double-quantum dot

characteristic shows a negative differential conductance region induced by the electronic correlation. This phenomenon is a consequence of the properties of the two stage Kondo regime under the effect of an external applied potential that takes the system out of equilibrium. The problem is solved using the mean-field finite-

Quantum interference effects in two double quantum dots-molecules embedded in an Aharonov―Bohm ring

U