TY  - JOUR
AU  - Khedri, A.
AU  - Meden, V.
AU  - Costi, Theodoulos
TI  - Influence of phonon-assisted tunneling on the linear thermoelectric transport through molecular quantum dots
JO  - Physical review / B
VL  - 96
IS  - 19
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-07823
SP  - 195156
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000416235500008
DO  - DOI:10.1103/PhysRevB.96.195156
UR  - https://juser.fz-juelich.de/record/840276
ER  -