You are kindly invited to:
Vincent Meyer Colloquium
Lecturer: Professor Eli Yablonovitch
“Searching for the Milli-Volt Switch”
In contemplating the headlong rush toward miniaturization represented by Moore’s Law, it is tempting to think only of the progression toward molecular sized components. There is a second aspect of Moore’s Law that is sometimes overlooked. Because of miniaturization, the energy efficiency of information processing steadily improves. We anticipate that the energy required to process a single bit of information will eventually become as tiny as 1 electron volt per function, truly indeed a molecular sized energy. Inevitably, most logic functions including storage, readout,
and other logical manipulations, will eventually be that efficient.
However there is one information-processing-function that bucks this trend. That is communication, especially over short distances. Our best projections, of improvements in the short distance communication function, show that it will still require hundreds of thousands of electron volts just to move one bit of information the tiny distance of only 10 micrometers. Why this energy per bit discrepancy for communications? It is caused by the difference in voltage scale between the wires and the transistor switches. Transistors are thermally activated, leading to a required voltage >>kT/q. Wires are long, and they have a low impedance, allowing them to operate efficiently even at ~1 millivolt.
The challenge then is to replace transistors with a new low-voltage switch that is better matched to the wires. I will present some of the technical options for such a new switch, which are being explored by the new NSF Science & Technology Center for Energy Efficient Electronics Science.
– Prof. Eli Yablonovitch will also deliver two additional lectures
“The Opto-Electronic Physics Which Just Broke the Efficiency Record in Solar Cells”
“The Two Conflicting Narratives of Metal-Optics”
Eli Yablonovitch is the Director of the NSF Center for Energy Efficient Electronics Science (E³S), a multi-University Center based at Berkeley. He received his Ph.D. degree in Applied Physics from Harvard University in 1972. He worked for two years at Bell Telephone Laboratories, and then became a professor of Applied Physics at Harvard. In 1979 he joined Exxon to do research on photovoltaic solar energy. Then in 1984, he joined Bell Communications Research, where he was a Distinguished Member of Staff, and also Director of Solid-State Physics Research. In 1992 he joined the University of California, Los Angeles, where he was the Northrop-Grumman Chair Professor of Electrical Engineering. Then in 2007 he became Professor of Electrical Engineering and Computer Sciences at UC Berkeley, where he holds the James & Katherine Lau Chair in Engineering.
Prof. Yablonovitch is a Fellow of the IEEE, the Optical Society of America and the American Physical Society. He is a Life Member of Eta Kappa Nu, and a Member of the National Academy of Engineering and the National Academy of Sciences. He has been awarded the Adolf Lomb Medal, the W. Streifer Scientific Achievement Award, the R.W. Wood Prize, the Julius Springer Prize, and the Mountbatten Medal. He also has an honorary Ph.D. from the Royal Institute of Technology, Stockholm Sweden.
In his photovoltaic research, Yablonovitch introduced the 4n2 light-trapping factor that is used commercially in almost all high performance solar cells.
Yablonovitch introduced the idea that strained semiconductor lasers could have superior performance due to reduced valence band (hole) effective mass. Today, almost all semiconductor lasers use this concept, including telecommunications lasers, DVD players, and red laser pointers.
Yablonovitch is regarded as one of the Fathers of the Photonic BandGap concept, and coined the term “Photonic Crystal”.
M. Xiao, I. Martin, E. Yablonovitch, and H. W. Jiang, “Electrical detection of the spin resonance of a single electron in a silicon field-effect transistor,” Nature, vol. 430, no. 6998, pp. 435-439, July 2004.
E. Yablonovitch, H. W. Jiang, H. Kosaka, H. D. Robinson, D. S. Rao, and T. Szkopek, “Optoelectronic quantum telecommunications based on spins in semiconductors (Invited Paper),” Proc. IEEE, vol. 91, no. 5, pp. 761-780, May 2003.
H. Kosaka, D. S. Rao, H. D. Robinson, P. Bandaru, K. Makita, and E. Yablonovitch, “Single photoelectron trapping, storage, and detection in a field effect transistor,” Physical Review B: Condensed Matter and Materials in Physics, vol. 67, no. 4, pp. 045104/1-5, Jan. 2003.
E. Yablonovitch, “Photonic crystals: Semiconductors of light,” Scientific American, vol. 285, no. 6, pp. 47-55, Dec. 2001.
I. Gontijo, M. Boroditsky, E. Yablonovitch, S. Keller, U. K. Mishra, and S. P. DenBaars, “Coupling of InGaN quantum-well photoluminescence to silver surface plasmons,” Physical Review B: Condensed Matter and Materials in Physics, vol. 60, no. 16, pp. 11564-1156, Oct. 1999.