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  • Title: Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet.
    Author: Nawa K, Tanaka K, Kurita N, Sato TJ, Sugiyama H, Uekusa H, Ohira-Kawamura S, Nakajima K, Tanaka H.
    Journal: Nat Commun; 2019 May 08; 10(1):2096. PubMed ID: 31068576.
    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.
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