Emergent many-body composite excitations of interacting spin-1/2 trimers

Abstract

Understanding exotic forms of magnetism in quantum spin systems is an emergent topic of modern condensed matter physics. Quantum dynamics can be described by particle-like carriers of information, known-as quasiparticles that appear from the collective behaviour of the underlying system. Spinon excitations, governing the excitations of quantum spin-systems, have been accurately calculated and precisely verified experimentally for the antiferromagnetic chain model. However, identification and characterization of novel quasiparticles emerging from the topological excitations of the spin system having periodic exchange interactions are yet to be obtained. Here, we report the identification of emergent composite excitations of the novel quasiparticles doublons and quartons in spin-1/2 trimer-chain antiferromagnet Na2Cu3Ge4O12 (having periodic intrachain exchange interactions J1-J1-J2) and its topologically protected quantum 1/3 magnetization-plateau state. The characteristic energies, dispersion relations, and dynamical structure factor of neutron scattering as well as macroscopic quantum 1/3 magnetization-plateau state are in good agreement with the state-of-the-art dynamical density matrix renormalization group calculations.

37 pages, 11 figures, 3 tables

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• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Universal emergence of the one-third plateau in the magnetization process of frustrated quantum spin chains
• Quantum vs. Classical Magnetization Plateaus of S=1/2 Frustrated Heisenberg Chains
• Magnetic Excitations of Spin Nematic State in Frustrated Ferromagnetic Chain
• Fractional and composite excitations of antiferromagnetic quantum spin trimer chains
• Density matrix renormalization group approach to the low temperature thermodynamics of correlated 1D fermionic models

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