Giving to CREOL CREOL, The College of Optics & Photonics

Professor Ryan Gelfand publishes paper in Nature Communications with colleagues from UT Dallas, Northwestern University, and UIUC

Magnetoresistive GNR unzipped from carbon nanotube and controlled by two parallel CNTs on an insulating material above a metallic gate. As all voltages are held constant, all currents are unidirectional. The magnitudes and relative directions of the input CNT control currents /CTRL determine the magnetic fields B and GNR edge magnetization, and thus the magnitude of the output current/GNR.

Professor Ryan Gelfand has published paper "Cascaded spintronic logic with low-dimensional carbon" in Nature Communications with colleagues from UT Dallas, Northwestern University, and UIUC.

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.

See also: "Engineer Unveils New Spin on Future of Transistors with Novel Design"

Posted Tuesday, June 6, 2017

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