Multiple topologically nontrivial bands in noncentrosymmetric YSn2

Y. Zhu, T. Zhang, J. Hu, J. Kidd, D. Graf, X. Gui, W. Xie, M. Zhu, X. Ke, H. Cao, Z. Fang, H. Weng, Z. Mao

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The square lattices formed by main-group elements such as Bi, Sb, Sn, and Si in layered materials have attracted a lot of interest, since they can create rich topological phases. In this paper, we report the slightly distorted square lattice of Sn in a noncentrosymmetric compound YSn2 generates multiple topologically nontrivial bands, one of which likely hosts a nodal line and tunable Weyl semimetal state induced by the Rashba spin-orbit coupling and proper external magnetic field. The quasiparticles described as relativistic fermions from these bands are manifested by nearly zero mass and nontrivial Berry phases probed in de Haas-van Alphen (dHvA) oscillations. The dHvA study also reveals YSn2 has a complicated Fermi surface, consisting of several three-dimensional (3D) and one 2D pocket. Our first-principles calculations show the pointlike 3D pocket at Y point on the Brillouin zone boundary hosts the possible Weyl state. Our findings establish YSn2 as a new interesting platform for observing novel topological phases and studying their underlying physics. \ 2018 American Physical Society.
Original languageEnglish
JournalPhysical Review B
Issue number3
StatePublished - 2018


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