Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 75: Poster Session: Transport 1
TT 75.2: Poster
Donnerstag, 23. März 2017, 15:00–19:00, P2-EG
Non-equilibrium transport through a disordered molecular nanowire — Patrick Thiessen1, Francisco Dominguez-Adame1,2, •Rudolf A Römer2, and Elena Diaz1 — 1University of Warwick, Coventry, CV4 7AL, United Kingdom — 2Universidad Complutense, E-28040 Madrid, Spain
We investigate the non-equilibrium transport properties of a disordered molecular nanowire. The nanowire is regarded as a quasi-one-dimensional organic crystal composed of self-assembled molecules. One orbital and a single random energy are assigned to each molecule while the inter- molecular coupling does not fluctuate. Consequently, electronic states are expected to be spatially localized. We consider the regime of strong localization, namely, the localization length is smaller than the length of the molecular wire. We also take into account the electron-vibron interaction that takes place in each single molecule. We investigate the interplay between disorder and electron-vibron interaction in response to either an applied electric bias or a temperature gradient. To this end, we calculate the electric and heat currents when the nanowire is connected to leads, using the Keldysh non-equilibrium Green's function formalism. At not very high temperature, scattering by disorder dominates both charge and energy transport. We find that the electron-vibron interaction enhances the effect of the disorder on the transport properties due to the exponential suppression of tunneling.