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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Friday, 17 June 2011
(at 13:00 in room 115, Hallwachsstr. 3)
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Are molecules calm enough in molecular electronics junctions?

Yoshihiro Asai

National Institute of Advanced Industrial Science and Technology (AIST)
Nanosystem Research Institute (NRI)

In the early stage of the research, molecular junction is believed to be calm, i.e., it is expected to give an example of collision less ballistic transport because of its smallness. It turned out to be wrong. The junctions were found to provide noisy play grounds for various interactions. The first example is electron-molecular-vibration coupling. It is known both experimentally and theoretically, to put important effects on the charge transport property of the junctions. The local heating problem will be discussed first to give the latest example of the issue where dissipation of the inelastic energy to thermalized electrode plays a distinct role. The second example is many-body electron correlation effect. Recently, we have shown theoretically that the electron correlation plays a very important role to give the giant rectification behavior found in tetraphenlydithiol derivative including dipyrimidinil-diphenly diblock.[1] This will be highlighted in my talk. Other latest results of mine include the stepping stone mechanism for the small beta found in Ru complex multi-layer films,[2] which will be discussed if my time permits. Refs.) [1] I.D\EDez-P\E9rez et al, Nature Chemistry, 635 (2009). [2]N. Tucitto et al, Nature Mat. 41 (2009).

Brief Bio:

I am now a condensed matter physics theorist, but I was from quantum chemistry, i.e., I took Ph.D in quantum chemistry at Prof. Kenich Fukui's group in Kyoto University in 1987. I moved to ETL/AIST condensed matter theory group headed by Dr. Jun Kondo where my carrier in condensed matter physics theory started. My field then was strongly correlated electron systems and the high-Tc mechanism for superconductivity. Having experienced group leader of Research Institute for Computational Sciences in AIST, visiting associate professor of Tokyo University and visiting professor of Institute for Molecular Science, I am now a deputy director of Nanosystem Research Institute (in AIST) which involves more than 100 tenured staff scientists. My present subjects are non-equilibrium transport theory and theory for molecular electronics.

slides (pdf)

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.09.01 Wed
author: webadmin