Are molecules calm enough in molecular electronics junctions?
Yoshihiro Asai
Nanosystem Research Institute (NRI)

June 17, 2011, 1 p.m.


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).



Share
Are molecules calm enough in molecular electronics junctions?
Yoshihiro Asai
Nanosystem Research Institute (NRI)

June 17, 2011, 1 p.m.


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).



Share