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Pantaleón, Pierre A; Xian, Y; Carrillo-Bastos, Ramon, E-mail: ppantaleon@uabc.edu.mx2019
AbstractAbstract
[en] We examine the combined effects of a Kekulé coupling texture (KC) and a Dzyaloshinskii–Moriya interaction (DMI) in a two-dimensional ferromagnetic honeycomb lattice. By analyzing the gap closing conditions and the inversions of the bulk bands, we identify the parameter range in which the system behaves as a trivial or a nontrivial topological magnon insulator. We find four topological phases in terms of the KC parameter and the DMI strength. We present the bulk-edge correspondence for the magnons in a honeycomb lattice with an armchair or a zigzag boundary. Furthermore, we find Tamm-like edge states due to the intrinsic on-site interactions along the boundary sites. Our results may have significant implications to magnon transport properties in the 2D magnets at low temperatures. (paper)
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Available from http://dx.doi.org/10.1088/1361-648X/aaf77b; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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