Experiments pursuant to determining the barrier traversal time for quantum tunneling
Article first published online: 19 OCT 2004
Copyright © 1993 John Wiley & Sons, Inc.
International Journal of Quantum Chemistry
Supplement: Proceedings of the International Syposium on Atomic, Molecular, and Condensed Matter Theory and Computational Methods
Volume 48, Issue Supplement 27, pages 807–814, 13/20 March 1993
How to Cite
Hagmann, M. J. and Zhao, L. (1993), Experiments pursuant to determining the barrier traversal time for quantum tunneling. Int. J. Quantum Chem., 48: 807–814. doi: 10.1002/qua.560480872
- Issue published online: 19 OCT 2004
- Article first published online: 19 OCT 2004
- Manuscript Received: 24 MAY 1993
Laser illumination of the junction of a scanning tunneling microscope (STM) modulates the barrier height by adding the electric field of light. Numerical simulations suggest that the dependence of tunneling current on the magnitude and frequency of the modulation can serve as a basis for determining the duration of barrier traversal. Modulation increases the mean value of the current when the frequency is much less than the reciprocal of the traversal time. Our simulations also suggest that a 670 nm laser diode at a power density of 100 W/cm2 will reduce the tunneling current. The latter effect is contrary to most competing phenomena such as current rectification, photo-assisted tunneling, thermal-assisted tunneling, and thermal expansion. We are completing a novel STM which has decreased noise and increased stability in order to make the laser/STM measurements. © 1993 John Wiley & Sons, Inc.