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

Lara, Gustavo A.; Orellana, P. A.; Anda, E. V.

doi:10.1103/physrevb.78.045323

Cited by 13 publications

(10 citation statements)

References 34 publications

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“…29 There are also some theoretical studies on the NDC effect in those systems, using models beyond the mean-field approximation. [30][31][32][33][34][35][36] In our work, electron interactions at the dots are treated within a mean-field approach. This approximation, plus additional correlations introduced through couplings to the F/S electrodes, gives rise to NDC effects.…”

Section: Introductionmentioning

confidence: 99%

Andreev tunneling through a double quantum-dot system coupled to a ferromagnet and a superconductor: Effects of mean-field electronic correlations

Siqueira

Cabrera

2010

Phys. Rev. B

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We study the transport properties of a hybrid nanostructure composed of a ferromagnet, two quantum dots, and a superconductor connected in series. By using the nonequilibrium Green's function approach, we have calculated the electric current, the differential conductance, and the transmittance for energies within the superconductor gap. In this regime, the mechanism of charge transmission is the Andreev reflection, which allows for a control of the current through the ferromagnet polarization. We have also included interdot and intradot interactions, and have analyzed their influence through a mean-field approximation. In the presence of interactions, Coulomb blockade tend to localize the electrons at the double-dot system, leading to an asymmetric pattern for the density of states at the dots, and thus reducing the transmission probability through the device. In particular, for nonzero polarization, the intradot interaction splits the spin degeneracy, reducing the maximum value of the current due to different spin-up and spin-down densities of states. Negative differential conductance appears for some regions of the voltage bias, as a result of the interplay of the Andreev scattering with electronic correlations. By applying a gate voltage at the dots, one can tune the effect, changing the voltage region where this novel phenomenon appears. This mechanism to control the current may be of importance in technological applications.

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Section: Introductionmentioning

confidence: 99%

Andreev tunneling through a double quantum-dot system coupled to a ferromagnet and a superconductor: Effects of mean-field electronic correlations

Siqueira

Cabrera

2010

Phys. Rev. B

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“…Heidelberg, Germany † rogonzal@ugr.es views [17,18]. The avoided crossings in the field-dressed spectrum of OH were used to transfer population between two states of opposite parity, and the trap dynamics was observed in combined fields [18].…”

Section: Introductionmentioning

confidence: 99%

“…The avoided crossings in the field-dressed spectrum of OH were used to transfer population between two states of opposite parity, and the trap dynamics was observed in combined fields [18]. The theoretical analysis has been carried out under the assumption that the total angular momentum remains approximately constant, and, therefore, only the coupling between different Λdoublet states has been taken into account [17,18].…”

Section: Introductionmentioning

confidence: 99%

Fine structure of open-shell diatomic molecules in combined electric and magnetic fields

et al. 2013

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We present a theoretical study of the impact of an electric field combined with a magnetic field on the rotational dynamics of open shell diatomic molecules. Within the rigid rotor approximation, we solve the time-independent Schrödinger equation including the fine-structure interactions and the Λ-doubling effects. We consider three sets of molecule specific parameters and several field regimes and investigate the interplay between the different interactions identifying the dominant one. The possibility of inducing couplings between the spin and rotational degrees of freedom is demonstrated. ine structure, rotational motion, magnetic field, electric field

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“…Other theoretical works on generation of the ND conductance in double QDs connected in series are references [54][55][56]. It was reported the ND conductance induced by the electronic correlation in a side-coupled double QDs [57]. As for a double-QD molecule embedded in an AB ring, the magnetic-flux-induced ND conductance was found in the strong interdot repulsion regime.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium electron and spin properties in a parallel double quantum dot Fano interference device

et al. 2010

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Nonequilibrium electron and spin transport properties in a parallel double quantum dot (QD) Fano interferometer are theoretically studied. With the shift of gate voltage around the chemical potential of either lead, we find the Fano lineshapes in the differential conductance spectra, which is sensitively determined by the bias voltage strength and appropriate QD level distributions. The intradot Coulomb interactions modulate the Fano interference in a substantial way and can induce the emergence of negative differential conductance, because of its nontrivial role in splitting the QD levels. In the presence of a local Rashba spin-orbit coupling, the interplay between the magnetic and Rashba fields induces the occurrence of the nonequilibrium spin-related Fano interference, different from the linear-transport results. Furthermore, the striking Coulomb-driven spin accumulation in the 'resonant-channel' QD appears.

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

Cited by 13 publications

References 34 publications

Andreev tunneling through a double quantum-dot system coupled to a ferromagnet and a superconductor: Effects of mean-field electronic correlations

Andreev tunneling through a double quantum-dot system coupled to a ferromagnet and a superconductor: Effects of mean-field electronic correlations

Fine structure of open-shell diatomic molecules in combined electric and magnetic fields

Nonequilibrium electron and spin properties in a parallel double quantum dot Fano interference device

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