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Monday, November 18, 2019 at 4:00pm to 5:00pm
Rockefeller Hall, Schwartz Auditorium
General Physics Colloquium, Professor Amir Yacoby, Harvard University.
Refreshments from 3:30-3:50 pm
Title: Quantum Sensing of Quantum Materials
Host: Katja Nowack
Abstract: The magnetic fields generated by spins and currents provide a unique window into the physics of correlated-electron materials and devices. Proposed only a decade ago, magnetometry based on the
electron spin of nitrogen-vacancy (NV) defects in diamond is emerging as a platform that is
exceptionally suited for probing condensed matter systems: it can be operated from cryogenic temperatures to above room temperature, has a dynamic range spanning from DC to GHz, and allows sensor-sample distances as small as a few nanometers. As such, NV magnetometry provides
access to static and dynamic magnetic and electronic phenomena with nanoscale spatial resolution.
While pioneering work focused on proof-of-principle demonstrations of its nanoscale imaging resolution and magnetic field sensitivity, now experiments are starting to probe the correlated-electron physics of magnets and superconductors and to explore the current distributions in low-
dimensional materials. In this talk, I will review some of our recent work that uses NV center
magnetometry to image skyrmions in thin magnetic films, measure the spin chemical potential in magnetic insulators, and image hydrodynamic electron flow in graphene.