Local Probes of Spin Excitations in Quantum Matter

Over 50 years ago Halperin and Hohenberg [1] predicted that certain magnetic systems behave analogously to liquid Helium. In this talk I will describe some of our recent work that uses NV center magnetometry to explore spin excitations in layered magnets.  By employing different measurement modalities we are able to directly observe signatures of magnon hydrodynamics and magnon second sound which is analogous to second sound in superfluid liquid Helium. Finally by directly detecting coherent spin waves we are able to devise a new scattering platform for exploring mesoscopic magnetism.
[1] Halperin and Hohenberg, Physical Review 188

*You will need to bring your cell phone, so you can sign in using the QR code outside of ATL 2400.  You will need to submit your first and last name, email, and affiliation on the form by 11:15am to be able to get lunch after the seminar.  Lunch is first come, first served.*

At 4pm, there will be a tea in ATL 2117 for our speaker and students/postdocs - this is a chance to ask questions directly to our speaker. Refreshments will be served.