Kondo-Dicke resonances in electronic transport through triple quantum dots

Trocha, Piotr; Barnaś, J.

doi:10.1103/physrevb.78.075424

Cited by 53 publications

(54 citation statements)

References 58 publications

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“…Very recently transport properties of triple quantum dots have become a subject of intensive studies due to various interesting effects that emerge in such structures [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50]. In particular, triple dots enable the investigation of spin-entangled currents [32], dark states [37,41], or various interference effects [34,39].…”

Section: Introductionmentioning

confidence: 99%

The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads

Weymann

2009

J. Phys.: Condens. Matter

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Abstract. We analyze numerically the spin-dependent transport through coherent chains of three coupled quantum dots weakly connected to external magnetic leads. In particular, using the diagrammatic technique on the Keldysh contour, we calculate the conductance, shot noise and tunnel magnetoresistance (TMR) in the sequential and cotunneling regimes. We show that transport characteristics greatly depend on the strength of the interdot Coulomb correlations, which determines the spacial distribution of electron wave function in the chain. When the correlations are relatively strong, depending on the transport regime, we find both negative TMR as well as TMR enhanced above the Julliere value, accompanied with negative differential conductance (NDC) and super-Poissonian shot noise. This nontrivial behavior of tunnel magnetoresistance is associated with selection rules that govern tunneling processes and various high-spin states of the chain that are relevant for transport. For weak interdot correlations, on the other hand, the TMR is always positive and not larger than the Julliere TMR, although super-Poissonian shot noise and NDC can still be observed.

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Section: Introductionmentioning

confidence: 99%

The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads

Weymann

2009

J. Phys.: Condens. Matter

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“…[9][10][11] This interaction is responsible for several fascinating phenomena, e.g., Coulomb blockade, 11,12 and Kondo effect, 7,13,14 leading to characteristic behavior of the thermodynamical and transport properties, which depend drastically on the number of QDs, as well as on their topological configuration in the structure. In recent years, strong on-site interaction in double 13,[15][16][17][18][19][20][21][22][23][24] and triple [25][26][27][28][29][30][31][32] QD (DQD and TQD) structures have received a great deal of attention when in the Kondo regime. However, on-site electron-electron interaction does not exhaust all the possibilities in multiple QD structures, as electrons can, due to their proximity, interact with each other, even when located in different QDs.…”

Section: Introductionmentioning

confidence: 99%

Capacitively coupled double quantum dot system in the Kondo regime

et al. 2011

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A detailed study of the low-temperature physics of an interacting double quantum dot system in a T-shape configuration is presented. Each quantum dot is modeled by a single Anderson impurity and we include an inter-dot electron-electron interaction to account for capacitive coupling that may arise due to the proximity of the quantum dots. By employing a numerical renormalization group approach to a multi-impurity Anderson model, we study the thermodynamical and transport properties of the system in and out of the Kondo regime. We find that the two-stage-Kondo effect reported in previous works is drastically affected by the inter-dot Coulomb repulsion. In particular, we find that the Kondo temperature for the second stage of the two-stage-Kondo effect increases exponentially with the inter-dot Coulomb repulsion, providing a possible path for its experimental observation.

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“…Let us emphasize that this is a behavior typical for the Dicke effect known in quantum optics where the narrow/broad energy features correspond to the states weakly/strongly coupled to the electromagnetic field and they contribute the subradiant/superradiant emission lines [14]. Recently a similar concept of the Kondo-Dicke effect has been proposed in mesoscopic physics for a set of three vertically coupled quantum dots [15]. Our proposal (5) formally belongs to the same class of models.…”

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confidence: 80%

Electron pair current through the correlated quantum dot

Domański

Donabidowicz

2009

Physica Status Solidi (b)

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We study the charge current transmitted through the correlated quantum dot characterized by a finite magnitude of the Coulomb interaction |U|. At low temperatures the correlations can lead to appearance of the spin (for U>0) or charge (for U<0) Kondo states qualitatively affecting the transport properties. We explore an influence of the charge Kondo effect on the electron pair tunneling introducing the auxiliary two-component model which describes the fluctuations between empty and doubly occupied states of the quantum dot.Comment: 4 pages, 2 figure

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Kondo-Dicke resonances in electronic transport through triple quantum dots

Cited by 53 publications

References 58 publications

The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads

The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads

Capacitively coupled double quantum dot system in the Kondo regime

Electron pair current through the correlated quantum dot

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