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

Kazuhiro Nawa, Kimihiko Tanaka, Nobuyuki Kurita, Taku J. Sato, Haruki Sugiyama, Hidehiro Uekusa, Seiko Ohira-Kawamura, Kenji Nakajima, Hidekazu Tanaka

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1 Citation (Scopus)

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 Ba 2 CuSi 2 O 6 Cl 2 . 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 Ba 2 CuSi 2 O 6 Cl 2 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.

Original languageEnglish
Article number2096
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Nawa, K., Tanaka, K., Kurita, N., Sato, T. J., Sugiyama, H., Uekusa, H., Ohira-Kawamura, S., Nakajima, K., & Tanaka, H. (2019). Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet. Nature communications, 10(1), [2096]. https://doi.org/10.1038/s41467-019-10091-6