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

I. Rousochatzakis, S. Kourtis, J. Knolle, R. Moessner, N. B. Perkins

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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 α-RuCl3, show magnetic order at low temperatures T, here we demonstrate numerically a dynamical crossover from magnonlike behavior 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. It is further shown to go hand in hand with persistent typicality down to very low T. This aspect, which has also been observed in the spin-1/2 kagome Heisenberg antiferromagnet, is a signature of proximate spin liquidity and emergent gauge degrees of freedom more generally, and can be the basis for the numerical study of many finite-T properties of putative spin liquids.

Original languageEnglish (US)
Article number045117
JournalPhysical Review B
Issue number4
StatePublished - Jul 12 2019

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