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 and Hidekazu Tanaka ()
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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

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-10091-6

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