Thermopower of single-molecule devices

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 currentvoltage characteristic, which, by contrast, probes the system far from equilibrium.

• Publication year

  2004

• Venue

  Physical Review B

• Publication date

  2004-05-19

• Fields of study

  Physics

• Identifiers
  DOI 10.1103/PhysRevB.70.195107arXiv cond-mat/0405453
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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