Kondo effect in side coupled double quantum-dot molecule

Lara, Gustavo A.; Orellana, P. A.; Yáñez, Julio M.; Anda, E. V.

doi:10.1016/j.ssc.2005.08.016

Cited by 13 publications

(12 citation statements)

References 36 publications

(44 reference statements)

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“…There exists, however, another possibility for a Kondo effect in two-level quantum dots and in double quantum dot (DQD) systems due to orbital degeneracy, where the orbitals serve as a pseudospin degree of freedom [41]. The interplay between strong correlations and various interference effects significantly modifies transport properties of systems based on double quantum dots [42][43][44][45][46][47][48][49][50]. Particularly, the interplay of Dicke and Kondo effects has been predicted to greatly increase transport characteristics in quantum dot systems [23,51,52] and is likely to increase thermoelectric power of the system [50,[53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Spin-dependent thermoelectric effects in a strongly correlated double quantum dot

Karwacki¹,

Trocha²

2016

Phys. Rev. B

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We investigate spin-dependent thermoelectric transport through a system of two coupled quantum dots attached to reservoirs of spin-polarized electrons. Generally, we focus on the strongly correlated regime of transport. To this end, a slave-boson method for finite U is employed. Our main goal is to show that, apart from complex low-temperature physics, such a basic multilevel system provides a possibility to examine various quantum interference effects, with particular emphasis put on the influence of such phenomena on thermoelectric transport. Apart from the influence of interference effects on spin-degenerate charge transport, we show how spin-dependent transport, induced by ferromagnetic leads, can be modified as well. Finally, we also consider the case where the spin-relaxation time in the ferromagnetic leads is relatively long, which leads to the so-called spin thermoelectric effects.

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Section: Introductionmentioning

confidence: 99%

Spin-dependent thermoelectric effects in a strongly correlated double quantum dot

Karwacki¹,

Trocha²

2016

Phys. Rev. B

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“…To demonstrate the potential of the method, we focus on the physics of the Kondo effect in a single-dot, where we find excellent agreement with exact Bethe ansatz (BA) results. As there is a timely interest in more involved versions of Kondo physics, such as multi-channel situations, 5 SU(4), 22,23 as well as two-stage Kondo (TSK) effects, 24,25,26,27,28,29 we further apply LDECA to study a double-dot structure side-connected to leads. This system, with a subtle TSK ground state similar to the one studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

Method to study highly correlated nanostructures: The logarithmic-discretization embedded-cluster approximation

et al. 2008

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This work proposes a new approach to study transport properties of highly correlated local structures. The method, dubbed the Logarithmic Discretization Embedded Cluster Approximation (LDECA), consists of diagonalizing a finite cluster containing the many-body terms of the Hamiltonian and embedding it into the rest of the system, combined with Wilson's idea of a logarithmic discretization of the representation of the Hamiltonian. The physics associated with both one embedded dot and a double-dot side-coupled to leads is discussed in detail. In the former case, the results perfectly agree with Bethe ansatz data, while in the latter, the physics obtained is framed in the conceptual background of a two-stage Kondo problem. A many-body formalism provides a solid theoretical foundation to the method. We argue that LDECA is well suited to study complicated problems such as transport through molecules or quantum dot structures with complex ground states.

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“…At the theoretical level the interest in the transport properties of parallel quantum dots (PQD) is not new and has been mainly focused on Kondo correlations and interference effects [8][9][10][11][12]. In most cases the dots accommodate at most two spins, are coupled to the same pair of leads and the driving bias is fixed.…”

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confidence: 99%

Coulomb drag in parallel quantum dots

Moldoveanu

Tanatar

2009

Europhys. Lett.

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We study theoretically the electronic transport in parallel few-level quantum dots in the presence of both intradot and interdot long-range Coulomb interaction. Each dot is connected to two leads and the steady-state currents are calculated within the Keldysh formalism using the random-phase approximation for the interacting Green functions. Due to the momentum transfer between the two systems it is possible to get a nonvanishing current through an unbiased Coulombblockaded dot, if the other dot is set in the nonlinear transport regime. The transitions between the levels of the passive dot reduce the drag current and lead to negative differential conductance. We also discuss the dependence on temperature and the role of the lead-dot coupling.

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Kondo effect in side coupled double quantum-dot molecule

Cited by 13 publications

References 36 publications

Spin-dependent thermoelectric effects in a strongly correlated double quantum dot

Spin-dependent thermoelectric effects in a strongly correlated double quantum dot

Method to study highly correlated nanostructures: The logarithmic-discretization embedded-cluster approximation

Coulomb drag in parallel quantum dots

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