Nonperturbative Semiclassical Spin Dynamics for Ordered Quantum Magnets
The study investigated spin dynamics in ordered quantum magnets using Truncated Hilbert Space Exact Diagonalization (THED) and Matrix Product State (MPS) simulations. The research found that anomalous spin excitation continua observed in experiments are actually two-magnon resonances, arising from the hybridization of bound states and the continuum. This dual approach provides a robust framework for understanding non-perturbative effects in gapped quantum magnets.