Negative Differential Resistance in the Scanning Tunneling Spectroscopy of Organic molecules

Details Negative Differential Resistance in the Scanning Tunneling Spectroscopy of Organic molecules Negative Differential Resistance in the Scanning Tunneling Spectroscopy of Organic molecules

1998-11-28

arxiv.org/abs/cond-mat/9811402v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 Pages, 4 figures, submitted to Phys. Rev. B Rapid Communication

Scientific paper

10.1103/PhysRevB.59.R7852

The conductance-voltage spectrum of molecular nanostructures measured by scanning tunneling spectroscopy (STS) is generally assumed to reflect the local density of states of the molecule. This excludes the possibility of observing negative differential resistance (NDR). We report here the observation of NDR in the scanning tunneling microscope (STM) current-voltage (I-V) characteristics of self-assembled monolayer (SAM) of 4-p-Terphenylthiol molecules on gold substrate measured using a platinum probe. We argue that the NDR arises from narrow structures in the local density of states at the tip apex atom and show that depending on the electrostatic potential profile across the system, NDR could be observed in one or both bias directions.

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