Nanocomputing: From Nanowires to Nanomagnets

Professor Supriyo Bandyopadhyay
October 25, 2013 - 3:30 pm

Supriyo Bandyopadhyay, PhD

Virginia Commonwealth University

Hosted by: Avik Ghosh

Friday, October 25th, 2013

3:30 – 4:30 pm

Thornton E-316

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