Acoustic phonon dispersion of $\alpha$-RuCl${}_3$

Abstract

Acoustic phonons have recently been posited as playing an integral role in explaining the half-quantized thermal Hall effect in $\alpha$-RuCl${}_3$. Therefore, we present much needed inelastic x-ray scattering measurements of its acoustic phonon dispersion, along with calculations using the frozen-phonon method. We also discuss a temperature study which conclusively shows a first-order structural transition to a non-$C2/m$ space group at low temperature. Together these results are an important backbone for future theoretical and experimental studies of $\alpha$-RuCl${}_3$.

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Cited by in corpus (10)

• Symmetry-based requirement for the measurement of electrical and thermal Hall conductivity under an in-plane magnetic field
• Thermal Hall Effect in the Kitaev-Heisenberg System with Spin-Phonon Coupling
• Stacking disorder in $\alpha$-RuCl${}_3$ via x-ray three-dimensional difference pair distribution function analysis
• Phonon Dynamics in the Generalized Kitaev Spin Liquid
• Static and fluctuating zigzag order, and possible signatures of Kitaev physics, in torque measurements of $\alpha$-RuCl${}_3$
• Non-local features of the spin-orbit exciton in Kitaev materials
• Phonon Dynamics in the Chiral Kitaev Spin Liquid
• Signatures of a gapless quantum spin liquid in the Kitaev material Na${}_3$Co${}_{2-x}$Zn${}_x$SbO${}_6$
• Sound attenuation in the hyperhoneycomb Kitaev spin liquid
• Spin-phonon coupling and thermal Hall effect in the Kitaev model