Phonon-assisted thermoelectric effects in strongly interacting quantum dot

Yang, Kai-Hua; Zhao, Yaliang; Wu, Yan-Ju; Wu, Yupeng

doi:10.1016/j.physleta.2010.05.002

Cited by 13 publications

(13 citation statements)

References 55 publications

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“…Incidentally, our calculations invoking NCA is valid outside the Fermi liquid state too. In the initial dot energy level, T ≫ T K and our numerical results reveal a much larger thermoelectric figure of merit than the final dot energy level owing to the suppression of the Lorentz number greatly in line with previous steady state results [14][15][16] . Consequently, the instantaneous figure of merit exhibits a sharp jump upon switching the dot level abruptly at t=0.…”

Section: Resultssupporting

confidence: 91%

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Designer thermal switches: the effect of the contact material on instantaneous thermoelectric transport through a strongly interacting quantum dot

Goker¹,

Gedik²

2013

J. Phys.: Condens. Matter

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We investigate the effect of contact geometry on the instantaneous thermoelectric response of a quantum dot pushed suddenly into the Kondo regime via a gate voltage using time dependent non-crossing approximation and linear response Onsager relations. We utilize graphene and metal contacts for this purpose. Instantaneous thermopower displays sinusoidal oscillations whose frequency is proportional to the energy separation between the van Hove singularity in the contact density of states and Fermi level for both cases regardless of the asymmetry factor at the onset of Kondo timescale. The amplitude of the oscillations increases with decreasing temperature saturating around the Kondo temperature. We also calculate the instantaneous figure of merit and show that the oscillations taking place at temperatures above the Kondo temperature are enhanced more than the onesoccurring at lower temperatures due to the violation of the Wiedemann-Franz law. Graphene emerges as a more promising electrode candidate than ordinary metals in single electron devices since it can minimize these oscillations.

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Section: Resultssupporting

confidence: 91%

“…Behaviour of the thermopower and figure of merit has been elucidated as a function of temperature both in Kondo [14][15][16] and mixed valence regimes 16 . These studies were largely in line with the experimental work and confirmed the critical role the impurity energy level plays in the sign of thermopower.…”

Section: Introductionmentioning

confidence: 99%

Designer thermal switches: the effect of the contact material on instantaneous thermoelectric transport through a strongly interacting quantum dot

Goker¹,

Gedik²

2013

J. Phys.: Condens. Matter

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“…17 The effect of electron-vibration coupling on the thermoelectric properties of few level molecules or dots has been studied by the rate equation 18 and Green function 16,[39][40][41][42] formalism. However, in these papers, the phonon thermal contribution G ph K to the figure of merit ZT has not been calculated or discussed.…”

Section: -38mentioning

confidence: 99%

Electron-vibration effects on the thermoelectric efficiency of molecular junctions

2014

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The thermoelectric properties of a molecular junction model, appropriate for large molecules such as fullerenes, are studied within a non-equilibrium adiabatic approach in the linear regime at room temperature. A self-consistent calculation is implemented for electron and phonon thermal conductance showing that both increase with the inclusion of the electron-vibration coupling. Moreover, we show that the deviations from the Wiedemann-Franz law are progressively reduced upon increasing the interaction between electronic and vibrational degrees of freedom. Consequently, the junction thermoelectric efficiency is substantially reduced by the electron-vibration coupling. Even so, for realistic parameters values, the thermoelectric figure of merit can still have peaks of the order of unity. Finally, in the off-resonant electronic regime, our results are compared with those of an approach which is exact for low molecular electron densities. We give evidence that in this case additional quantum effects, not included in the first part of this work, do not affect significantly the junction thermoelectric properties in any temperature regime.

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“…The reduction of the height of the peaks in the presence of the EPI was previously reported about single QD systems in both the Coulomb blockade 25 and the Kondo regimes. 35 Figure 3 shows the thermopower as a function of the energy levels of the QDs for different ks. In low temperature and k ¼ 0, the thermopower becomes zero in some energies.…”

Section: -3mentioning

confidence: 99%

Influence of electron-phonon interaction on the thermoelectric properties of a serially coupled double quantum dot system

Tagani

Soleimani

2012

Journal of Applied Physics

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The effect of electron-phonon interaction (EPI) on the thermoelectric properties of a double quantum dot system weakly coupled to external electrodes is analyzed using master equation formalism. The influence of the EPI, temperature, interdot tunneling strength, and Coulomb repulsions on the electrical and thermal conductances, thermopower, and figure of merit is studied in detail. The electrical conductance is reduced in the presence of the EPI, while the thermal conductance is increased. Furthermore, it is observed that the magnitude of the electrical and thermal conductances can be tuned by using the interdot tunneling strength. It is also found that although the magnitude of the figure of merit is reduced in the presence of the EPI, the number of peaks is enhanced.

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Phonon-assisted thermoelectric effects in strongly interacting quantum dot

Cited by 13 publications

References 55 publications

Designer thermal switches: the effect of the contact material on instantaneous thermoelectric transport through a strongly interacting quantum dot

Designer thermal switches: the effect of the contact material on instantaneous thermoelectric transport through a strongly interacting quantum dot

Electron-vibration effects on the thermoelectric efficiency of molecular junctions

Influence of electron-phonon interaction on the thermoelectric properties of a serially coupled double quantum dot system

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