Multiple topologically non-trivial bands in non-centrosymmetric YSn<sub>2</sub>

We show that, in non-centrosymmetric compound YSn₂, the slightly distorted square lattice of Sn generates multiple topologically non-trivial bands, one of which likely hosts nodal line and tunable Weyl semimetal state induced by the Rashba spin-orbit coupling (SOC) and proper external magnetic field. The quasiparticles described as relativistic fermions from these bands are manifested by nearly zero mass and non-trivial Berry phases probed in de Haas–van Alphen (dHvA) oscillations. The dHvA study also reveals YSn₂ has a complicated Fermi surface (FS), consisting of several 3D and one 2D pockets. Our first principle calculations show the point-like 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.

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session C04: Dirac/Weyl Semimetals -- Nodal-line Semimetals and Beyond

Abstract: C04.00007 : Multiple topologically non-trivial bands in non-centrosymmetric YSn2

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Abstract: C04.00007 : Multiple topologically non-trivial bands in non-centrosymmetric YSn₂