Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Dual-Method Approaches to Quantum Many-Body Systems I
TT 15.11: Vortrag
Montag, 12. März 2018, 17:45–18:00, H 0104
Influence of phonon-assisted tunneling on the thermoelectric transport through molecular quantum dots — •Andisheh Khedri1,2, Theo Costi2, and Volker Meden1 — 1Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA--Fundamentals of Future Information Technology, 52056 Aachen, Germany — 2Peter Grünberg Institut and Institute for Advanced Simulation, Research Center Jülich, 52425 Jülich, Germany
We investigate the effect of vibrational degrees of freedom on the 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 in the linear response regime, 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. By applying the functional renormalization group on the Keldysh contour, we further study the nonlinear thermoelectric transport in scenarios, in which the vibrating molecule is coupled to reservoirs held at different temperatures and chemical potentials.