Performance analysis and parametric optimum criteria of the nanothermoelectric engine with a single-level quantum dot at maximum power

Wang, Hao; Wu, Guoxing; Fu, Yueming; Chen, Daojiong

doi:10.1063/1.4711096

Cited by 12 publications

(11 citation statements)

References 39 publications

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“…2]. Much of the above remains qualitatively the same when including a junction and spin [53][54][55][56] dependence of the tunneling constants Γ ασ , or a combined voltage (µ L > µ R ) and thermal bias [39][40][41] (Γ T L < T R U ): Interestingly, in the latter case the COSET resonances may be used experimentally to estimate the thermal gradient in situ 46 .…”

Section: @Imentioning

confidence: 99%

“…Works addressing the nonlinear regime have either applied effective single-particle descriptions [34][35][36][37][38] or focused on thermoelectric devices close to resonance assuming weak tunneling [39][40][41] or a weak Coulomb interaction [42]. The heat current has received much less attention [39][40][41][42]. A classification of nonlinear heat-transport features for a strongly interacting nanostructure going beyond weak tunneling, matching that of charge transport [43][44][45], still seems to be missing.…”

mentioning

confidence: 99%

“…This includes the study of resonant tunneling [26], inelastic tunneling [27][28][29], and Kondo processes [30][31][32][33]. Works addressing the nonlinear regime have either applied effective single-particle descriptions [34][35][36][37][38] or focused on thermoelectric devices close to resonance assuming weak tunneling [39][40][41] or a weak Coulomb interaction [42]. The heat current has received much less attention [39][40][41][42].…”

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confidence: 99%

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Charge fluctuations in nonlinear heat transport

et al. 2015

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We show that charge fluctuation processes are crucial for the nonlinear heat conductance through an interacting nanostructure, even far from a resonance. We illustrate this for an Anderson quantum dot accounting for the first two leading orders of the tunneling in a master equation. The often made assumption that off-resonant transport proceeds entirely by virtual occupation of charge states, underlying exchange-scattering models, can fail dramatically for heat transport. The identified energy-transport resonances in the Coulomb blockade regime provide qualitative information about relaxation processes, for instance, by a strong negative differential heat conductance relative to the heat current. These can go unnoticed in the charge current, making nonlinear heat-transport spectroscopy with energy-level control a promising experimental tool. [6]. Here, by analyzing the generic effects of Coulomb interactions on the nonlinear heat transport in nanoscale systems, we will show that this is very promising.Interaction effects have long been probed using gate controlled charge-current spectroscopy, a well-developed experimental tool to access the discrete quantum levels of nanostructures. Two prominent features in the charge current driven by a source-drain voltage underpin this successful method. The first is resonant or single-electron tunneling (SET), which depends on the level position relative to the electrochemical potential, μ R in Fig. 1(a): An electron jumps into or out of an orbital level, directly leading to a real change of its occupancy. The current shows sharp steps as new resonant transport processes are switched on with increasing bias. These processes are routinely identified in a three-terminal setup by plotting the charge conductance as function of the applied bias V and the gate voltage, as exemplified in Fig. 2(a). Two-terminal measurements, e.g., using a scanning probe, correspond to line traces through such a plot. The second type of resonance is independent of the level position and appears as a horizontal line at V = since it originates in the inelastic excitation by an energy at fixed local electron number on the nanostructure. This off-resonant feature requires a second-order tunneling process in which an electron "scatters through," other charge states being only visited virtually [see Fig. 1(b)]. This is known as inelastic electron tunneling (IETS) [7,8] or inelastic cotunneling (ICOT) [9][10][11][12].This inelastic tunneling resonance develops into a nonequilibrium Kondo resonance for low and low temperatures [13][14][15], which is much sharper [11,12] Thermoelectric transport has also been investigated within the two above-mentioned physical transport pictures. Theory mostly focused on the thermopower in the linear-response regime. This includes the study of resonant tunneling [26], inelastic tunneling [27][28][29], and Kondo processes [30][31][32][33]. Works addressing the nonlinear regime have either applied effective single-particle descriptions [34][35][36][37][38] or focused on th...

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Section: @Imentioning

confidence: 99%

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Charge fluctuations in nonlinear heat transport

et al. 2015

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“…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. Recent findings 90,99 indicate a Seebeck coefficient which is enhanced with respect to the equilibrium result.…”

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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“…After that, a variety of models of the ESE heat engines and refrigerators were proposed. Based on the finite time thermodynamics, the performance of these heat engines and refrigerators are optimized, and many novel results have been obtained [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristics and Optimal Analysis of an Energy Selective Electron Refrigerator

Cong¹,

Li²,

Luo³

et al. 2014

Int. J. Thermo

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In this paper, the energy selective electron (ESE) refrigerator with an ideal energy filter based on resonant tunneling is established. It consists of two infinitely large electron reservoirs with different temperatures and chemical potentials, and electrons can be exchanged between the two reservoirs through the ideal energy filter. According to Landauer formula and the assumption of being coupled tightly with the electron current, the expressions for the heat flux, the cooling rate and the coefficient of performance (COP) are derived analytically. The performance characteristic curves such as the cooling rate versus coefficient of performance, the cooling rate and coefficient of performance versus the position of energy level are plotted by numerical calculation. The optimal regions of the cooling rate and the COP are determined. Moreover, we optimize the cooling rate and the COP respectively with respect to the position of energy level. The influence of the width of energy level on performance of the ESE refrigerator is discussed. Finally, based on the optimization criterionfor refrigerator, i.e. the product of the COP times the cooling rate, the optimal performance of the ESE refrigerator is discussed in detail.

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Performance analysis and parametric optimum criteria of the nanothermoelectric engine with a single-level quantum dot at maximum power

Cited by 12 publications

References 39 publications

Charge fluctuations in nonlinear heat transport

Charge fluctuations in nonlinear heat transport

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

Performance Characteristics and Optimal Analysis of an Energy Selective Electron Refrigerator

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