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Unusual magnetotransport from Si-square nets in topological semimetal HfSiS

MPS-Authors
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Kumar,  Nitesh
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Manna,  Kaustuv
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Qi,  Yanpeng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wu,  Shu-Chun
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wang,  Lei
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yan,  Binghai
Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shekhar,  Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Kumar, N., Manna, K., Qi, Y., Wu, S.-C., Wang, L., Yan, B., et al. (2017). Unusual magnetotransport from Si-square nets in topological semimetal HfSiS. Physical Review B, 95(12): 121109, pp. 1-5. doi:10.1103/PhysRevB.95.121109.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-2DD5-C
Abstract
The class of topological semimetals comprises a large pool of compounds. Together they provide a wide platform to realize exotic quasiparticles, for example, Dirac, nodal-line Dirac, and Weyl fermions. In this Rapid Communication, we report the Berry phase, Fermi-surface topology, and anisotropic magnetoresistance of HfSiS which has recently been predicted to be a nodal-line semimetal. This compound contains a large carrier density, higher than most of the known semimetals. Massive amplitudes of de Haas-van Alphen and Shubnikov-de Haas oscillations up to 20 K in 7 T assist us in witnessing a nontrivial pi-Berry phase, which is a consequence of topological Dirac-type dispersion of bands originating from the hybridization of p(x) + p(y) and d(x2-y2) orbitals of square-net plane of Si and Hf atoms, respectively. Furthermore, we establish the three-dimensional Fermi surface which consists of very asymmetric water caltroplike electrons and barley seedlike hole pockets which account for the anisotropic magnetoresistance in HfSiS.