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Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet

Author

Listed:
  • Kazuhiro Nawa

    (Tohoku University)

  • Kimihiko Tanaka

    (Tokyo Institute of Technology)

  • Nobuyuki Kurita

    (Tokyo Institute of Technology)

  • Taku J. Sato

    (Tohoku University)

  • Haruki Sugiyama

    (Tokyo Institute of Technology)

  • Hidehiro Uekusa

    (Tokyo Institute of Technology)

  • Seiko Ohira-Kawamura

    (J-PARC Center)

  • Kenji Nakajima

    (J-PARC Center)

  • Hidekazu Tanaka

    (Tokyo Institute of Technology)

Abstract

Search for topological materials has been actively promoted in the field of condensed matter physics for their potential application in energy-efficient information transmission and processing. Recent studies have revealed that topologically invariant states, such as edge states in topological insulators, can emerge not only in a fermionic electron system but also in a bosonic system, enabling nondissipative propagation of quasiparticles. Here we report the topologically nontrivial triplon bands measured by inelastic neutron scattering on the spin-1/2 two-dimensional dimerized antiferromagnet Ba2CuSi2O6Cl2. The excitation spectrum exhibits two triplon bands that are clearly separated by a band gap due to a small alternation in interdimer exchange interaction, consistent with a refined crystal structure. By analytically modeling the triplon dispersion, we show that Ba2CuSi2O6Cl2 is the first bosonic realization of the coupled Su-Schrieffer-Heeger model, where the presence of topologically protected edge states is prompted by a bipartite nature of the lattice.

Suggested Citation

  • Kazuhiro Nawa & Kimihiko Tanaka & Nobuyuki Kurita & Taku J. Sato & Haruki Sugiyama & Hidehiro Uekusa & Seiko Ohira-Kawamura & Kenji Nakajima & Hidekazu Tanaka, 2019. "Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10091-6
    DOI: 10.1038/s41467-019-10091-6
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