Ioannis Rousochatzakis

Loughborough University

Quantum spin liquid at finite temperature: proximate dynamics and persistent typicality

Quantum spin liquids are long-range entangled states of matter with emergent gauge fields and fractionalized excitations. While candidate materials, such as the Kitaev honeycomb ruthenate a-RuCl3, show magnetic order at low temperatures T, here I will present numerical simulations that demonstrate a dynamical crossover from magnon-like behaviour at low T and frequencies ω, to long-lived fractionalized fermionic quasiparticles at higher T and ω. This crossover is akin to the presence of spinon continua in quasi-1D spin chains, and will be shown to go hand in hand with persistent typicality down to very low T.  This, which we argue is a signature of proximate spin liquidity and emergent gauge degrees of freedom more generally, will be useful for the numerical study of many finite-T properties of putative quantum spin liquids.

Zoom-link: https://ucph-ku.zoom.us/j/66299519490?pwd=cHlLS0pjYVRSQit2SW1NNFhHb0VBQT09

Zoom-password: NielsBohr