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

Anup Kumar Bera, S. M. Yusuf (), Sudip Kumar Saha, Manoranjan Kumar, David Voneshen, Yurii Skourski and Sergei A. Zvyagin
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Anup Kumar Bera: Bhabha Atomic Research Centre
S. M. Yusuf: Bhabha Atomic Research Centre
Sudip Kumar Saha: S. N. Bose National Centre for Basic Sciences
Manoranjan Kumar: S. N. Bose National Centre for Basic Sciences
David Voneshen: ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford
Yurii Skourski: Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf
Sergei A. Zvyagin: Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-34342-1

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