Abstract
Electron spin resonance (ESR) represents one of the oldest, and one of the most precise, measurements of spin dynamics. In my talk I describe key reasons that make ESR a particularly informative probe of spin dynamics in quantum spin liquids.
I focus on two specific examples and describe the ESR response of a two-dimensional spin liquid with spinon Fermi surface as well as that of a frustrated spin-1/2 Heisenberg chain. I also present experimental verification of our theoretical predictions by the electron spin resonance (ESR) experiments on a model material K2CuSO4Br2. Here we exploit the unique feature of the material, "the uniform DM interaction between chain’s spins", in order to access the small momentum regime of the dynamic spin susceptibility. By measuring interaction-induced splitting between the two components of the ESR doublet we directly determine the magnitude of the marginally irrelevant backscattering interaction between spinons for the first time ever.
This event is organized by the HKU-UCAS Joint Institute of Theoretical and Computational Physics and HK Institute of Quantum Science & Technology
Anyone interested is welcome to attend.