Supriyo Bandyopadhyay, PhD
Virginia Commonwealth University
Hosted by: Avik Ghosh
Friday, October 25th, 2013
3:30 – 4:30 pm
The building block of modern digital computers is the celebrated transistor which is a chargebased
switch and whose two stable conductance states encode the binary bits 0 and 1. Switching
between the two states always requires changing the stored charge, which inevitably causes current
flow and excessive energy dissipation. This impedes extreme high density integration and has assorted
other disadvantages such as reliability degradation. Two approaches have now emerged to counter this
threat. One is a non-traditional architectural approach that does not use transistor switches as
information processors and instead relies on charge interaction between passive non-linear devices (e.g.
nanowires with negative differential resistance) to elicit specific computational activity. The other
approach is to encode bit information in the collective spins of the electrons inside a magnet, instead of
using electron charges inside a transistor. This talk will describe both approaches, pointing out the pros
and cons, and conclude with experimental advances made in our group towards implementing both
Supriyo Bandyopadhyay is Commonwealth Professor of Electrical and Computer
Engineering at Virginia Commonwealth University where he directs the Quantum Device Laboratory.
Research in this laboratory focuses on various aspects of nanotechnology, primarily spintronic and
magnetic devices, photodetectors and sensors. Dr. Bandyopadhyay is the author/co-author of over 300
research articles, two textbooks and has given over 100 invited seminars, keynote addresses and
colloquia across four continents. He is a Fellow of IEEE, APS, ECS, IoP and AAAS.
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The Advanced Speaker Series on Emerging Technologies brings eminent researchers from academia, industry and government
research labs to Grounds to present an overview of their current work geared towards students (undergraduate & graduate), faculty
and staff at the University of Virginia.
Nanocomputing: From Nanowires to