Kondo regimes in a three-dots quantum gate

Chiappe, G.; Anda, E. V.; Ribeiro, L. Costa; Louis, E.

doi:10.1103/physrevb.81.041310

Cited by 21 publications

(13 citation statements)

References 23 publications

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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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Section: Introductionmentioning

confidence: 99%

Capacitively coupled double quantum dot system in the Kondo regime

et al. 2011

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“…The transport properties of TQDs in various configurations have also been investigated [32][33][34][35][36][37][38][39][40][41]. In a serial TQD, different Kondo regimes can be sampled by measuring the conductance.…”

Section: Introductionmentioning

confidence: 99%

Entanglement switching via the Kondo effect in triple quantum dots

et al. 2014

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Abstract. We consider a triple quantum dot system in a triangular geometry with one of the dots connected to metallic leads. Using Wilson's numerical renormalization group method, we investigate quantum entanglement and its relation to the thermodynamic and transport properties in the regime where each of the dots is singly occupied on average, but with non-negligible charge fluctuations. It is shown that even in the regime of significant charge fluctuations the formation of the Kondo singlets induces switching between separable and perfectly entangled states. The quantum phase transition between unentangled and entangled states is analyzed quantitatively and the corresponding phase diagram is explained by exactly solvable spin model. In the framework of an effective model we also explain smearing of the entanglement transition for cases when the symmetry of the triple quantum dot system is relaxed.

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“…However, equilibrium stationary studies are reliable in our suggested device, since the processes taking place in the above system could be controlled by very different time scales B |e i |/t 2 . 51 To implement our theoretical predictions, we recommend a multiple monomer molecular system or a multi-orbital molecular system connected to noble metal leads or adsorbed on metal surfaces as the best candidates, for instance, the {Cr 7 Ni} molecular ring, which possesses an S = 1/2 ground state, due to the antiferromagnetic coupling between neighbouring ions. 8,38,52 Many-body ab initio studies show that the Coulomb integral in such a molecule is about several eV.…”

Section: Discussionmentioning

confidence: 99%