10/02/2020
Did you know that the United States recently became the first nation to use graphene in how the unit of the ohm is defined? Monolayer epitaxial graphene has been shown to have clearly superior properties for the improvement of devices (called QHRs) whose function depend on the quantum Hall effect and serve a critical role in defining electrical units for US industries. The recent progress in the development of these devices will be summarized in this talk, with specific focus on the following topics: (1) Stabilizing and controlling graphene’s electron density over centimeter scales without the use of electrostatic gating. (2) Expanding the utility of these graphene-based QHR devices by creating arrays that employ superconducting electrical contacts. (3) Exploring the avenue of p-n junctions as a possible future device to access many different quantum Hall resistance values.
Dr. Rigosi received the B.A., M.A., M.Phil., and Ph.D. degrees in physics from Columbia University, New York, NY. From 2008 to 2015, he was a Research Assistant with the Columbia Nano Initiative. From 2015 to 2016, he was a Joint Visiting Research Scholar with the Department of Applied Physics of Stanford University in Stanford, CA, and the PULSE Institute of SLAC National Accelerator Laboratory in Menlo Park, CA. Since 2016, he has been a Physicist at the National Institute of Standards and Technology in Gaithersburg, MD. His research interests include two-dimensional electron systems and applications of those systems’ behaviors for electrical metrology.