Scattering theory of thermocurrent in quantum dots and molecules

Zimbovskaya, Natalya A.

doi:10.1016/j.physe.2015.06.026

Cited by 4 publications

(8 citation statements)

References 43 publications

(66 reference statements)

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“…In this section, we focus on the effect of thermal phonons associated with the electrodes. To analyze this effect, it was suggested to employ the Buttiker's scattering theory [36] combined with certain NEGF results [14,143,144]. In these works, the molecular bridge is again represented as a single orbital coupled to the electrodes, as shown in figure 13.…”

Section: The Effect Of Thermal Phonons On the Thermoelectric Efficien...mentioning

confidence: 99%

“…The scattering matrix expresses outgoing wave amplitudes ′ ′ ′ ′ ′ b b a a a , , , , L R 3 4 5 and ′ a 6 in terms of incident ones b b a a a a , , , , , . L R 3 4 5 6 The expressions for M ik are derived in [143,144]. These matrix elements depend on scattering probabilities ε L R , associated with the effect of thermal phonons concentrated on the left ( ) ε L and right ( ) ε R electrode and on the transmission (t L, R ) and reflection (r L, R ) amplitudes characterizing barriers which separate the electrodes from the bridge.…”

Section: The Effect Of Thermal Phonons On the Thermoelectric Efficien...mentioning

confidence: 99%

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Seebeck effect in molecular junctions

Zimbovskaya

2016

J. Phys.: Condens. Matter

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Advances in the fabrication and characterization of nanoscale systems presently allow for a better understanding of their thermoelectric properties. As is known, the building blocks of thermoelectricity are the Peltier and Seebeck effects. In the present work we review results of theoretical studies of the Seebeck effect in single-molecule junctions and similar systems. The behavior of thermovoltage and thermopower in these systems is controlled by several factors including the geometry of molecular bridges, the characteristics of contacts between the bridge and the electrodes, the strength of the Coulomb interactions between electrons on the bridge, and of electron-phonon interactions. We describe the impact of these factors on the thermopower. Also, we discuss a nonlinear Seebeck effect in molecular junctions.

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Section: The Effect Of Thermal Phonons On the Thermoelectric Efficien...mentioning

confidence: 99%

Section: The Effect Of Thermal Phonons On the Thermoelectric Efficien...mentioning

confidence: 99%

Seebeck effect in molecular junctions

Zimbovskaya

2016

J. Phys.: Condens. Matter

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“…in single-molecule junctions with ferromagnetic electrodes) spin polarization of electrons may significantly influence the thermopower [32][33][34][35][36]. Also, the thermopower may be affected due to dissipative interactions of traveling electrons with the ambience [37][38][39][40][41][42] and due to effects of quantum interference [43,44].…”

Section: Introductionmentioning

confidence: 99%

Length-dependent Seebeck effect in single-molecule junctions beyond linear response regime

Zimbovskaya

2017

The Journal of Chemical Physics

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In the present work we theoretically study characteristics of nonlinear Seebeck effect in a singlemolecule junction with chain-like bridge of an arbitrary length. We have employed tight-binding models to compute electron transmission trough the system. We concentrate on analysis of dependences of thermovoltage V th and differential thermopower S on the bridge length. It is shown that V th becomes stronger and S grows as the bridge lengthens. We discuss the effects of the bridge coupling to the electrodes and of specific characteristics of terminal sites on the bridge on the length-dependent V th and S which appear when the system operates beyond linear response regime.

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“…Maximal efficiency is reached when the level lies far above the Fermi energy in the leads. A combination of the scattering matrix formalism with the nonequilibrium Green's function approach also provides encouraging results for the nonlinear conversion of heat into useful work employing molecular bridges with electron-electron and electron-phonon interactions [61].…”

Section: Molecular Junctionsmentioning

confidence: 99%

Nonlinear phenomena in quantum thermoelectrics and heat

Sánchez

López

2016

Comptes Rendus. Physique

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We review recent developments in nonlinear quantum transport through nanostructures and mesoscopic systems driven by thermal gradients or in combination with voltage biases. Low-dimensional conductors are excellent platforms to analyze both the thermoelectric and heat dynamics beyond linear response because due to their small size a small temperature difference applied across regions gives rise to large thermal biases. We offer a theoretical discussion based on the scattering approach to highlight the differences between the linear and the nonlinear regimes of transport. We discuss recent experiments on quantum dots and molecular junctions subjected to strong temperature differences. Theoretical predictions concerning the Kondo effect and heat rectification proposals are briefly examined. An important issue is the calculation of thermoelectric efficiencies including nonlinearities. Cross Seebeck effects and nonlinear spin filtering arise in superconductors and topological insulators while mixed noises between charge and heat currents are also considered. Finally, we provide an outlook on the possible future directions of the field.Comment: Review article. Comments are welcome. v2: Added references. Published versio

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Scattering theory of thermocurrent in quantum dots and molecules

Cited by 4 publications

References 43 publications

Seebeck effect in molecular junctions

Seebeck effect in molecular junctions

Length-dependent Seebeck effect in single-molecule junctions beyond linear response regime

Nonlinear phenomena in quantum thermoelectrics and heat

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