Cascaded spintronic logic with low-dimensional carbon

Joseph S. Friedman (), Anuj Girdhar, Ryan M. Gelfand, Gokhan Memik, Hooman Mohseni, Allen Taflove, Bruce W. Wessels, Jean-Pierre Leburton and Alan V Sahakian
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Joseph S. Friedman: Northwestern University
Anuj Girdhar: University of Illinois at Urbana-Champaign
Ryan M. Gelfand: Northwestern University
Gokhan Memik: Northwestern University
Hooman Mohseni: Northwestern University
Allen Taflove: Northwestern University
Bruce W. Wessels: Northwestern University
Jean-Pierre Leburton: University of Illinois at Urbana-Champaign
Alan V Sahakian: Northwestern University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Remarkable breakthroughs have established the functionality of graphene and carbon nanotube transistors as replacements to silicon in conventional computing structures, and numerous spintronic logic gates have been presented. However, an efficient cascaded logic structure that exploits electron spin has not yet been demonstrated. In this work, we introduce and analyse a cascaded spintronic computing system composed solely of low-dimensional carbon materials. We propose a spintronic switch based on the recent discovery of negative magnetoresistance in graphene nanoribbons, and demonstrate its feasibility through tight-binding calculations of the band structure. Covalently connected carbon nanotubes create magnetic fields through graphene nanoribbons, cascading logic gates through incoherent spintronic switching. The exceptional material properties of carbon materials permit Terahertz operation and two orders of magnitude decrease in power-delay product compared to cutting-edge microprocessors. We hope to inspire the fabrication of these cascaded logic circuits to stimulate a transformative generation of energy-efficient computing.

Date: 2017
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DOI: 10.1038/ncomms15635

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