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26 April 2024 |
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Magnon-spinon dichotomy in the Kitaev hyperhoneycomb lio | | Alejandro Ruiz
; Nicholas P. Breznay
; Mengqun Li
; Ioannis Rousochatzakis
; Anthony Allen
; Isaac Zinda
; Vikram Nagarajan
; Gilbert Lopez
; Mary H. Upton
; Jungho Kim
; Ayman H. Said
; Xian-Rong Huang
; Thomas Gog
; Diego Casa
; Robert J. Birgeneau
; Jake D. Koralek
; James G. Analytis
; Natalia B. Perkins
; Alex Frano
; | | Date: |
4 Feb 2021 | | Abstract: | The family of edge-sharing tri-coordinated iridates and ruthenates has
emerged in recent years as a major platform for Kitaev spin liquid physics,
where spins fractionalize into emergent magnetic fluxes and Majorana fermions
with Dirac-like dispersions. While such exotic states are usually pre-empted by
long-range magnetic order at low temperatures, signatures of Majorana fermions
with long coherent times have been predicted to manifest at intermediate and
higher energy scales, similar to the observation of spinons in quasi-1D spin
chains. Here we present a Resonant Inelastic X-ray Scattering study of the
magnetic excitations of the hyperhoneycomb iridate $eta$-Li$_2$IrO$_3$ under
a magnetic field with a record-high-resolution spectrometer. At
low-temperatures, dispersing spin waves can be resolved around the predicted
intertwined incommensurate spiral and field-induced zigzag orders, whose
excitation energy reaches a maximum of 16meV. A 2T magnetic field softens the
dispersion around ${f Q}=0$. The behavior of the spin waves under magnetic
field is consistent with our semiclassical calculations for the ground state
and the dynamical spin structure factor, which further predicts that the ensued
intertwined uniform states remain robust up to very high fields (100 T). Most
saliently, the low-energy magnon-like mode is superimposed by a broad continuum
of excitations, centered around 35meV and extending up to 100meV. This
high-energy continuum survives up to at least 300K -- well above the ordering
temperature of 38K -- and gives evidence for pairs of long-lived Majorana
fermions of the proximate Kitaev spin liquid. | | Source: | arXiv, 2102.02714 | | Services: | Forum | Review | PDF | Favorites | |
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