UNC Physics Colloquium

Gleb Finkelstein, Duke University

“Graphene-based superconducting quantum Hall devices”

Superconductivity and the quantum Hall effect are some of the most studied phenomena in condensed matter physics. The more familiar of these phenomena – the superconductivity – results in vanishing electron resistance, and has its roots in the Cooper pairing of electrons. The quantum Hall effect is observed in quasi-two dimensional electron systems subject to high magnetic fields, and results in precise quantization of electrical resistance to better than one part in a billion. Combining superconductivity and the QH effect is predicted to be a promising route for creating novel “topological” quantum states of matter. In the past few years several groups made progress in inducing superconductivity in the QH regime. In particular, our group demonstrated the existence of supercurrent in a QH regime in graphene – a single atomic monolayer of graphite. I will review this result and our recent work on making a quantum Hall-based SQUID (superconducting quantum interference device)

This lecture will be in-person and available remotely via Zoom: https://unc.zoom.us/j/92531103794?pwd=aDJmRHJCVjhveGYyMXRaeG1Pekw2dz09, p/w: 596014