Physics at Virginia

"Electron spin resonance spectroscopy of quantum spin liquids"

Oleg Starykh , The University of Utah, Salt Lake City
[Host: Prof. Dima Pesin]

Much of the current research in quantum magnetism is motivated by the search for an elusive quantum spin liquid (QSL) state of the magnetic matter. A salient feature of this entangled quantum state is the presence of fractionalized elementary excitations such as spin-1/2 spinons, interactions between which are mediated by the emergent gauge field. 

In my talk, I provide a historical perspective on quantum spin liquids and shed some light on the origins of  this ``weird” idea. Following a brief summary of the current state of affairs in QSL research, I describe  how QSLs respond to the magnetic field and demonstrate surprising similarity of the described response to that of neutral Fermi liquids.

I illustrate these theoretical ideas with a recent electron spin resonance measurements on quasi-one-dimensional antiferromagnet K2CuSO4Br2. The experiment leads the first-ever spectroscopic determination of the (backscattering) interaction between spinon excitations of the quantum spin chain.

Friday, April 8, 2022
3:30 PM
Ridley Hall, Room G008

Attend virtually via Zoom: 

 Add to your calendar

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Colloquia), date, name of the speaker, title of talk, and an abstract (if available).