Influence of phonon-assisted tunneling on the linear thermoelectric transport through molecular quantum dots

Abstract

We investigate the effect of vibrational degrees of freedom on the linear thermoelectric transport through a single-level quantum dot described by the spinless Anderson-Holstein impurity model. To study the effects of strong electron-phonon coupling, we use the nonperturbative numerical renormalization group approach. We also compare our results, at weak to intermediate coupling, with those obtained by employing the functional renormalization group method, finding good agreement in this parameter regime. When applying a gate voltage at finite temperatures, the inelastic scattering processes, induced by phonon-assisted tunneling, result in an interesting interplay between electrical and thermal transport. We explore different parameter regimes and identify situations for which the thermoelectric power as well as the dimensionless figure of merit are significantly enhanced via a Mahan-Sofo type of mechanism. We show, in particular, that this occurs at strong electron-phonon coupling and in the antiadiabatic regime.

arXiv comment14 pages, 8 figures, Published version

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Cited by in corpus (8)

• Hierarchical quantum master equation approach to electronic-vibrational coupling in nonequilibrium transport through nanosystems: Reservoir formulation and application to vibrational instabilities
• Nonequilibrium open quantum systems with multiple bosonic and fermionic environments: A hierarchical equations of motion approach
• Nonequilibrium thermoelectric transport through vibrating molecular quantum dots
• Exponential and power-law renormalization in phonon-assisted tunneling
• Exact solution of electronic transport in semiconductors dominated by scattering on polaronic impurities
• Finite-bias transport through the interacting resonant level model coupled to a phonon mode -- a functional renormalization group study
• Polaronic Entanglement of Quantum dot Molecule in a voltage-controlled junction
• Charge density wave breakdown in a heterostructure with electron-phonon coupling