Elimination of negative differential conductance in an asymmetric molecular transistor by an ac-voltage

Details Elimination of negative differential conductance in an asymmetric molecular transistor by an ac-voltage Elimination of negative differential conductance in an asymmetric molecular transistor by an ac-voltage

2007-05-18

arxiv.org/abs/0705.2624v1

Appl. Phys. Lett. 90, 242101 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted by Appl. Phys. Lett

Scientific paper

10.1063/1.2748090

We analyze resonant tunneling subject to a non-adiabatic time-dependent bias-voltage through an asymmetric single molecular quantum dot with coupling between the electronic and vibrational degrees of freedom using a {\em Tien-Gordon-type} rate equation. Our results clearly exhibit the appearance of photon-assisted satellites in the current-voltage characteristics and the elimination of hot-phonon-induced negative differential conductance with increasing ac driving amplitude for an asymmetric system. This can be ascribed to an {\em ac-induced suppression} of unequilibrated (hot) phonons in an asymmetric system.

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