Thermopower of Single-Molecule Devices

Details Thermopower of Single-Molecule Devices Thermopower of Single-Molecule Devices

2004-05-19

arxiv.org/abs/cond-mat/0405453v2

Phys. Rev. B 70, 195107 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 7 figures included; minor changes, version published in PRB

Scientific paper

10.1103/PhysRevB.70.195107

We investigate the thermopower of single molecules weakly coupled to metallic leads. We model the molecule in terms of the relevant electronic orbitals coupled to phonons corresponding to both internal vibrations and to oscillations of the molecule as a whole. The thermopower is computed by means of rate equations including both sequential-tunneling and cotunneling processes. Under certain conditions, the thermopower allows one to access the electronic and phononic excitation spectrum of the molecule in a linear-response measurement. In particular, we find that the phonon features are more pronounced for weak lead-molecule coupling. This way of measuring the excitation spectrum is less invasive than the more conventional current-voltage characteristic, which, by contrast, probes the system far from equilibrium.

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