REMINDER: CME Seminar Announcement: Enrique del Barco, today @11:30am

[Gardner, Joanna D.]

Good Morning,

Please join us today for a Condensed Matter Experiment  Seminar presented by Professor Enrique del Barco from the University of Central Florida at 11:30am in 1080 Smith Seminar, PRB. Learn more about Dr. del Barco's  seminar topic, "Tunneling In Single-Molecule Junctions: Temperature And Gating Effects" below. Thank you and we look forward to seeing you there!

Abstract

Understanding how the mechanism of charge transport through molecular tunnel junctions depends on temperature is crucial to control electronic functionality in molecular electronic devices. So far only a few systems have been investigated as a function of bias and temperature and, consequently, thermal effects in molecular tunnel junctions are still poorly understood. I will present a detailed charge transport study of an individual redox-active molecule (based on ferrocene) over a wide range of temperatures and applied potentials. The results show the temperature dependence of the current to vary strongly as a function of the gate voltage. Specifically, the current across the molecule: i) exponentially increases in the Coulomb blockade regime; ii) decreases at the charge degeneracy points; and, iii) remains constant with temperature at resonance. Our observations can be well accounted for by a formal single-level tunneling model where the temperature dependence relies on the thermal broadening of the Fermi distributions of the electrons in the leads. I will also discuss the temperature behavior of tunneling through a compound molecule which behaves as a double quantum dot. In this case, charging of one dot electrically gates the electrostatic potential of the neighboring dot, making the conduction to transit from the inverted Marcus regime (T-independent) to the thermally activated Marcus regime.

Sincerely,
Joanna

[The Ohio State University]
Joanna Gardner
Program Coordinator
College of Arts and Sciences Physics
2021 Physics Research Building, 191 W Woodruff Avenue, Columbus, OH 43210
614-292-3437 Office
gardner.306 at osu.edu<mailto:gardner.306 at osu.edu> osu.edu<http://osu.edu>


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osu.edu/pipermail/physics-other/attachments/20170413/c48603dc/attachment-0001.html>