NUSNNI Seminar Series 2002 No.2

Time: January 25, 2002, 3:00-4:00pm
Venue: Science Auditorium LT31, Block S16, NUS
Speaker: Dr Christian Joachim (Molecular Electronics Group, CEMES-CNRS, FRANCE)
Title: From Hybrid to mono-molecular Electronics
Abstract:
The physics of discrete molecular electronics devices like the C60 single molecule amplifier and the nanotube transistor are described together with the companion logic and memory circuit design for such hybrid devices in a planar technology. Those devices and circuits are very limited in performances and do not offer good perspectives for miniaturization even if a full processor can be designed with them. Second, progress toward a full integration of complex electronic functions on a single molecule will be presented such as super-tunneling effects and intramolecular circuit rules. STM approach to the measure of the conductance of a single molecular wire in a planar geometry will be described open the quest for a new UHV technology for planar mono-molecular electronics. Finally intramolecular switching experiments will be presented as a first approach of an active intramolecular devices along such circuits.

References:
A memory/adder model based on single C60 molecular transistor R. Staddler, S. Ami, M. Forshaw and C. Joachim, Nanotechnology, in press (2001).

Logic gates and memory cells based on single C60 electromechanical transistors S. Ami and C. Joachim, Nanotechnology, 12, 44 (2001).

Conformational changes of single molecules induced by STM manipulation as intramolecular switching, F. Moresco, G. Meyer, K.H. Rieder, H. Tang, A. Gourdon and C. Joachim, Phys. Rev. Lett., 86, 674 (2001).

Co-planar carbon nanotube hybrid molecular transistor fabricated in parallel, T. Ondarcuhu, C. Joachim, and S. Gerdes, Europhys. Lett., 52, 178 (2000).

Electronics using Hybrid molecular and mono molecular Devices C. Joachim, J.K. Gimzewski and A. Aviram, Nature, 408, 541 (2000).

Spatially resolved tunneling along a single molecular wire, V. Langlais, R.R. Schlittler, H. Tang, A. Gourdon, C. Joachim and J.K. Gimzewski, Phys. Rev. Lett., 83, 2809 (1999).

About the Speaker:
Dr. Christian Joachim is the Director of Research at CNRS, and author of more than 130 scientific publications. He has been the co-director of two North Atlantic Treaty Organization Advance Research Workshops on Nanoscale sciences. Amongst the awards he has received are the French Chemical Physics Prize for its work on electron transfer theory (1988), the IBM France Prize for his work on tunnelling through a molecule (1991), the 1997 Feynman Prize (with J.K. Gimzewski and R.R. Schlittler) in Nanotechnology, the 1999 French Nanotechnology Prize and the 1999 IBM Corporation "Shared University Research (SUR)" Award. His research achievements include demonstrating the non exponential behaviour of electron transfer through a molecule, pioneering research on electrical contact on a single molecule using the STM, and introducing the Elastic Scattering Quantum Chemistry (ESQC) technique, now a standard in STM image calculations. His recent accomplishments are the theory of atomic and molecular manipulation with the STM, the discovery of long range tunnel processes through a molecule, the fabrication of metal-insulator-metal planar nanojunctions for the planar implementation of molecular devices and the discovery of the first molecular rotor.