Correlated decay of triplet excitations in the Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)${}_2$

Abstract

The temperature dependence of the gapped triplet excitations (triplons) in the 2D Shastry-Sutherland quantum magnet SrCu${}_2$(BO${}_3$)${}_2$ is studied by means of inelastic neutron scattering. The excitation amplitude rapidly decreases as a function of temperature while the integrated spectral weight can be explained by an isolated dimer model up to 10~K. Analyzing this anomalous spectral line-shape in terms of damped harmonic oscillators shows that the observed damping is due to a two-component process: one component remains sharp and resolution limited while the second broadens. We explain the underlying mechanism through a simple yet quantitatively accurate model of correlated decay of triplons: an excited triplon is long-lived if no thermally populated triplons are near-by but decays quickly if there are. The phenomenon is a direct consequence of frustration induced triplon localization in the Shastry--Sutherland lattice.

5 pages, 4 figures

References in corpus (8)

• Bose-Einstein Condensation in Magnetic Insulators
• Finite-temperature lineshapes in gapped quantum spin chains
• Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets
• Field dependence of the quantum ground state in the Shastry-Sutherland system SrCu${}_2$(BO${}_3$)${}_2$
• In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu(2-x)Mgx(BO3)2
• Doped Valence Bond Solid and Superconductivity on the Shastry-Sutherland Lattice
• Spin-polaron excitations in a doped Shastry-Sutherland model
• Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu${}_2$(BO${}_3$)${}_2$ doped with nonmagnetic impurities

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• Ultrafast Frustration-Breaking and Magnetophononic Driving of Singlet Excitations in a Quantum Magnet
• Real-space imaging of dispersive triplon excitations in engineered quantum magnets
• Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu${}_2$(BO${}_3$)${}_2$
• Theory of rare-earth Kramers magnets on a Shastry-Sutherland lattice: dimer phases in presence of strong spin-orbit coupling
• Anomalous thermal broadening in the Shastry-Sutherland model and SrCu${}_2($BO${}_3{)}_2$
• Spectroscopy and complex-time correlations using minimally entangled typical thermal states
• Formulation of spin Nernst effect for spin-nonconserving insulating magnets
• Intrinsic suppression of topological thermal Hall effect in an exactly solvable quantum magnet
• Spiral Phase and Phase Diagram of the $S$=1/2 XXZ Model on the Shastry-Sutherland Lattice
• Fate of Bosonic Topological Edge Modes in the Presence of Many-Body Interactions