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

Research output: Contribution to journalArticle

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

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Condensed matter physics
Inelastic neutron scattering
Exchange interactions
Physics
Neutrons
Automatic Data Processing
Energy gap
Crystal structure
Electrons
Processing
condensed matter physics
alternations
data transmission
inelastic scattering
neutron scattering
insulators
crystal structure
propagation
excitation
electrons

ASJC Scopus subject areas

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

Cite this

Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet. / Nawa, Kazuhiro; Tanaka, Kimihiko; Kurita, Nobuyuki; Sato, Taku J.; Sugiyama, Haruki; Uekusa, Hidehiro; Ohira-Kawamura, Seiko; Nakajima, Kenji; Tanaka, Hidekazu.

In: Nature communications, Vol. 10, No. 1, 2096, 01.12.2019.

Research output: Contribution to journalArticle

Nawa, K, Tanaka, K, Kurita, N, Sato, TJ, 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, vol. 10, no. 1, 2096. https://doi.org/10.1038/s41467-019-10091-6
Nawa, Kazuhiro ; Tanaka, Kimihiko ; Kurita, Nobuyuki ; Sato, Taku J. ; Sugiyama, Haruki ; Uekusa, Hidehiro ; Ohira-Kawamura, Seiko ; Nakajima, Kenji ; Tanaka, Hidekazu. / Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet. In: Nature communications. 2019 ; Vol. 10, No. 1.
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