Spin thermopower in interacting quantum dots

Rejec, T.; Žitko, Rok; Mravlje, Jernej; Ramšak, A.

doi:10.1103/physrevb.85.085117

Cited by 85 publications

(118 citation statements)

References 52 publications

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“…An accurate description of the spectral and transport properties in the most challenging (nonperturbative) regime of intermediate temperatures and bias voltages T, φ T K has however not been feasible until recently. While the electronic transport has been studied extensively, the thermoelectric transport theory mostly focused on the linear response regime 13,25,[71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] . The nonlinear regime has been addressed mainly in the weak coupling limit 32,78,[90][91][92][93][94][95][96][97] , a systematic analysis including renormalization effects 66,67,98,99 beyond the perturbative regime is still missing.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

et al. 2016

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We study nonequilibrium thermoelectric transport properties of a correlated impurity connected to two leads for temperatures below the Kondo scale. At finite bias, for which a current flows across the leads, we investigate the differential response of the current to a temperature gradient. In particular, we compare the influence of a bias voltage and of a finite temperature on this thermoelectric response. This is of interest from a fundamental point of view to better understand the two different decoherence mechanisms produced by a bias voltage and by temperature. Our results show that in this respect the thermoelectric response behaves differently from the electric conductance. In particular, while the latter displays a similar qualitative behavior as a function of voltage and temperature, both in theoretical and experimental investigations, qualitative differences occur in the case of the thermoelectric response. In order to understand this effect, we analyze the different contributions in connection to the behavior of the impurity spectral function versus temperature. Especially in the regime of strong interactions and large enough bias voltages we obtain a simple picture based on the asymmetric suppression or enhancement of the split Kondo peaks as a function of the temperature gradient. Besides the academic interest, these studies could additionally provide valuable information to assess the applicability of quantum dot devices as responsive nanoscale temperature sensors.

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Section: Introductionmentioning

confidence: 99%

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

et al. 2016

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“…[19]. Two-terminal geometries using mesoscopic conductors have been considered, notably using quantum dots [5,20,21,7,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]. In the two-terminal geometry, both temperature and voltage bias are applied to the sample and the thermoelectric response is investigated.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric energy harvesting with quantum dots

2014

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Abstract. We review recent theoretical work on thermoelectric energy harvesting in multi-terminal quantum-dot setups. We first discuss several examples of nanoscale heat engines based on Coulomb-coupled conductors. In particular, we focus on quantum dots in the Coulomb-blockade regime, chaotic cavities and resonant tunneling through quantum dots and wells. We then turn towards quantum-dot heat engines that are driven by bosonic degrees of freedom such as phonons, magnons and microwave photons. These systems provide interesting connections to spin caloritronics and circuit quantum electrodynamics.

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“…Double quantum dots supporting molecular states are believed to display enhanced thermoelectric power [35]. The spin Seebeck coefficient, which measures the spin current generated in response to a thermal gradient, shows interesting features when many-body interactions are taken into account [36][37][38]. It turns out that the thermopower is a reliable probe of correlations in QD systems with SU(4) Kondo symmetry [39].…”

Section: Introductionmentioning

confidence: 99%

Fate of the spin- 12 Kondo effect in the presence of temperature gradients

Sierra¹,

López²,

Sánchez³

2017

Phys. Rev. B

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We consider a strongly interacting quantum dot connected to two leads held at quite different temperatures. Our aim is to study the behavior of the Kondo effect in the presence of large thermal biases. We use three different approaches, namely, a perturbation formalism based on the Kondo Hamiltonian, a slave-boson mean-field theory for the Anderson model at large charging energies and a truncated equation-of-motion approach beyond the Hartree-Fock approximation. The two former formalisms yield a suppression of the Kondo peak for thermal gradients above the Kondo temperature, showing a remarkably good agreement despite their different ranges of validity. The third technique allows us to analyze the full density of states within a wide range of energies. Additionally, we have investigated the quantum transport properties (electric current and thermocurrent) beyond linear response. In the voltage-driven case, we reproduce the split differential conductance due to the presence of different electrochemical potentials. In the temperature-driven case, we observe a strongly nonlinear thermocurrent as a function of the applied thermal gradient. Depending on the parameters, we can find nontrivial zeros in the electric current for finite values of the temperature bias. Importantly, these thermocurrent zeros yield direct access to the system's characteristic energy scales (Kondo temperature and charging energy).

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Spin thermopower in interacting quantum dots

Cited by 85 publications

References 52 publications

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

Thermoelectric energy harvesting with quantum dots

Fate of the spin- 12 Kondo effect in the presence of temperature gradients

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