Séminaire du LPTMS: Simon Pigeon *** séminaire exceptionnel ***


11:30 - 12:00

LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
15 Rue Georges Clemenceau, Orsay, 91405
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Vibrational assisted conduction in a molecular wire

Simon Pigeon (LKB, UPMC, Paris)

I will present a detailed study of the conduction properties of a molecular wire where hopping processes between electronic sites are coupled to a vibrational mode of the molecule. This description is inspired by the idea that physically the vibrational mode does not need to change the energetic structure of the electronic part but can just perturb the exchange taking place on this subsystem. It is shown that the presence of the vibrational system can give rise to strong enhancement of the wire conductivity. Moreover through the control of the vibrational properties (temperature and position) one can accurately control the electronic flux crossing the device. An increase of the temperature enhances the conduction, while the control of the equilibrium position of the oscillator can switch on and off the conduction.

This work establishes how vibrational coupled hopping affects the electronic properties of a molecular wire. These crucial results pave the way to a better understanding and more complete description of electronic properties of these promising devices.

  • S. Pigeon, L. Fusco, G. De Chiara & M. Paternostro, Vibrational assisted conduction in a molecular wire, Quantum Science and Technology 2, 025006 (2017) ; arXiv:1612.01809
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