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Pump-Probe Noise Spectroscopy of Molecular Junctions.

  • Author(s): Ochoa, Maicol A;
  • Selzer, Yoram;
  • Peskin, Uri;
  • Galperin, Michael
  • et al.

Published Web Location

https://doi.org/10.1021/jz502484z
Abstract

The slow response of electronic components in junctions limits the direct applicability of pump-probe type spectroscopy in assessing the intramolecular dynamics. Recently the possibility of getting information on a sub-picosecond time scale from dc current measurements was proposed. We revisit the idea of picosecond resolution by pump-probe spectroscopy from dc measurements and show that any intramolecular dynamics not directly related to charge transfer in the current direction is missed by current measurements. We propose a pump-probe dc shot noise spectroscopy as a suitable alternative. Numerical examples of time-dependent and average responses of junctions are presented for generic models.

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