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

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

doi:10.1103/PhysRevB.100.045117

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

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Moessner, Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Rousochatzakis, I., Kourtis, S., Knolle, J., Moessner, R., & Perkins, N. B. (2019). Quantum spin liquid at finite temperature: Proximate dynamics and persistent typicality. Physical Review B, 100(4): 045117. doi:10.1103/PhysRevB.100.045117.

Cite as: https://hdl.handle.net/21.11116/0000-0004-B017-B

Abstract

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 alpha-RuCl3, show magnetic order at low temperatures T, here we demonstrate numerically a dynamical crossover from magnonlike behavior at low T and frequencies omega to long-lived fractionalized fermionic quasiparticles at higher T and omega. 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.