The recent experimental realization of emergent quasiparticles, such as spinons, doublons, and quartons, in a $\mathrm{spin}\text{−}1/2$ trimer chain has spurred new interest in low-dimensional magnetic systems. In this study, we investigate the dynamical properties of the isotropic $\mathrm{spin}\text{−}1$ trimer chain with antiferromagnetic intratrimer $(J>0)$ and intertrimer $(J^{\prime }>0)$ exchange couplings, unveiling various quasiparticles: magnons, singletons, triplons, pentons, and heptons. For weak intertrimer exchange coupling $J^{\prime }/J\ll 1$, it behaves as an effective $\mathrm{spin}\text{−}1$ chain with a valence bond solid ground state. Employing density-matrix renormalization group techniques, we compute the dynamical structure factor which reveals a gapped magnon band along with weakly dispersive singleton, excited triplon, and penton energy bands. The evolution of these excitations with intertrimer coupling $J^{\prime }$ is also examined, providing insight into the underlying excitation mechanisms. For a $\mathrm{spin}\text{−}1$ chain, these exotic quasiparticles eventually reduce to conventional magnon excitations as $J^{\prime }/J\to 1$. Our results also shed light on the rich and complex excitation spectrum of $\mathrm{spin}\text{−}1$ trimer chains and offer a unique perspective on the dynamics in quantum spin systems.

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• Magnetism
• Magnons
• Quasiparticles & collective excitations
• Spin dynamics
• 1-dimensional spin chains
• Antiferromagnets
• Magnetic systems
• Density matrix renormalization group
• Perturbative methods