Topological Triplon Band in the Dimerized Antiferromagnet

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  • Nawa Kazuhiro
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

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Other Title
  • ダイマー反強磁性体におけるトポロジカルトリプロンバンド
  • 受賞記事 ダイマー反強磁性体におけるトポロジカルトリポロンバンド
  • ジュショウ キジ ダイマー ハン キョウジセイタイ ニ オケル トポロジカルトリポロンバンド

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Description

<p>A topological insulator is a material that has gapped bulk and conducting edge states due to the difference in topological characteristics between the bulk and the edge. The concept of topologically insulating state has been extended to bosonic quasiparticles, such as magnons and triplons in solids. We demonstrate that triplons construct bands with topologically protected edge states in the spin-1/2 dimerized antiferromagnet Ba2CuSi2O6Cl2. A bond-alternation of interdimer couplings leads to complex hopping amplitudes of triplons, which leads to non-trivial topology of the bands. A triplon hopping model realized in Ba2CuSi2O6Cl2 is interpreted as a pseudo-one-dimensional variant of Su-Schrieffer-Heeger (SSH) model, indicating that topologically protected edge states are induced by a bipartite nature of the lattice.</p>

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  • hamon

    hamon 30 (2), 94-97, 2020-05-10

    The Japanese Society for Neutron Science

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