Abstract
Anisotropic triangular antiferromagnets can host two primary spin excitations, namely, spinons and triplons. Here, we utilize polarization-resolved Raman spectroscopy to assess the statistics and dynamics of spinons in Ca3ReO5Cl2. We observe a magnetic Raman continuum consisting of one- and two-pair spinon-antispinon excitations as well as triplon excitations. The twofold rotational symmetry of the spinon and triplon excitations are distinct from magnons. The strong thermal evolution of spinon scattering is compatible with the bosonic spinon scenario. The quasilinear spinon hardening with decreasing temperature is envisaged as the ordering of one-dimensional topological defects. This discovery will enable a fundamental understanding of novel phenomena induced by lowering spatial dimensionality in quantum spin systems.
Highlights
Anisotropic triangular antiferromagnets can host two primary spin excitations, namely, spinons and triplons
It is well known that the lowtemperature physics of spin chains is described by a TLL18
Based on polarization-dependent and temperature-dependent dynamical Raman scatterings of paradigmatic anisotropic triangular lattice (ATL) Ca3ReO5Cl2, we draw a landscape of low-energy excitations concerning their rotational symmetry, statistics, and dynamics
Summary
Anisotropic triangular antiferromagnets can host two primary spin excitations, namely, spinons and triplons. At zero temperature and in an asymptotically lowenergy limit, individual spin chains are weakly coupled by fluctuation-generated interactions[14]. Physical ramifications of this dimensional reduction are the emergence of deconfined fractional excitations and gauge symmetry[15,16,17,18]. In the quest for ATLs, Cs2CuCl4 and Ca3ReO5Cl2 have been reported as benchmark materials[22,23,24,25,26,27,28,29,30] Both compounds realize a similar degree of spatial anisotropy with ξ = 0.32–0.34 and, are expected to fall in a TLL phase. In addition to the sizable J, the large ratio J/TN ≈ 35 in Ca3ReO5Cl2 provides a sufficiently wide temperature window to access the inherent low-energy physics of ATLs
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