2024/05/28 by Zhenjiu Wang, Wang, Zhenjiu, Paul McClarty +7
Earth and Planetary Sciences · #FOS: Physical sciences #High-pressure geophysics and materials #Seismic Imaging and Inversion Techniques #Seismic Waves and Analysis #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2405.18475
openalex publication_date 2024/05/28 · openalex created_date 2024/05/30 · openalex updated_date 2026/07/28
The quantum magnet SrCu2(BO3)2 and its remarkably accurate theoretical description, the spin-1/2 Shastry-Sutherland model, host a variety of intriguing phenomena such as a dimer ground state with a nearly flat band of triplon excitations, a series of magnetization plateaux, and a possible pressure-induced deconfined quantum critical point. One open puzzle originating from inelastic neutron scattering and Raman experiments is the anomalous broadening of the triplon modes at relatively low temperatures compared to the triplon gap Δ. We demonstrate that the experimentally observed broadening is captured by the Shastry-Sutherland model. To this end, we develop a numerical simulation method based on matrix-product states to simulate dynamical spectral functions at nonzero temperatures accurately. Perturbative calculations identify the origin of this phenomenon as a small energy scale compared to Δ between single triplon and bound triplon states at the experimentally relevant model parameters.