An ultrafast, nanoscale molecular switch is proposed, based on extension of the concept of nonadiabatic alignment to surface-adsorbed molecules. The switch consists of a conjugated organic molecule adsorbed onto a semiconducting surface and placed near a scanning tunneling microscope tip. A low-frequency (sub-bandgap), polarized laser field is used to switch the system by orienting the molecule with the field polarization axis, thereby enabling conductance through the junction. Plasmonic enhancement and spatial localization of the incident field by the metallic tip allow operation at low intensities over a wide range of temperatures. The principles of nonadiabatic alignment lead to switch on and off time-scales far below rotational time-scales.

Abstract Type
poster
Primary Author
Matthew Reuter
University
Northwestern University
Abstract Title
Modelling Laser Field Alignment of Organic Molecules on Semiconductor Surfaces: Toward Ultrafast Molecular Switches
Abstract Author(s)
Matthew G. Reuter, Maxim Sukharev, and Tamar Seideman
Username
reuter
Fellowship Year
2007
First Name
Matthew
Last Name
Reuter
Program
CSGF
Area of Study
Chemical/Biomedical Engineering
Poster Group
Group 2
Poster Number
20