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Evidence of Topological Nodal-Line Fermions in ZrSiSe and ZrSiTe

Jin Hu, Zhijie Tang, Jinyu Liu, Xue Liu, Yanglin Zhu, David Graf, Kevin Myhro, Son Tran, Chun Ning Lau, Jiang Wei, and Zhiqiang Mao
Phys. Rev. Lett. 117, 016602 – Published 30 June 2016
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Abstract

A Dirac nodal-line semimetal phase, which represents a new quantum state of topological materials, has been experimentally realized only in a few systems, including PbTaSe2, PtSn4, and ZrSiS. In this Letter, we report evidence of nodal-line fermions in ZrSiSe and ZrSiTe probed in de Haas–van Alphen quantum oscillations. Although ZrSiSe and ZrSiTe share a similar layered structure with ZrSiS, our studies show the Fermi surface (FS) enclosing a Dirac nodal line has a 2D character in ZrSiTe, in contrast with 3D-like FS in ZrSiSe and ZrSiS. Another important property revealed in our experiment is that the nodal-line fermion density in this family of materials (1020cm3) is much higher than the Dirac fermion density of other topological materials with discrete nodes. In addition, we have demonstrated ZrSiSe and ZrSiTe single crystals can be thinned down to 2D atomic thin layers through microexfoliation, which offers the first platform to explore exotic properties of topological nodal-line fermions in low dimensions.

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  • Received 29 April 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.016602

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jin Hu1, Zhijie Tang1, Jinyu Liu1, Xue Liu1, Yanglin Zhu1, David Graf2, Kevin Myhro3, Son Tran3, Chun Ning Lau3, Jiang Wei1, and Zhiqiang Mao1,*

  • 1Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
  • 2National High Magnetic Field Lab, Tallahassee, Florida 32310, USA
  • 3Department of Physics, University of California, Riverside, California 92521, USA

  • *zmao@tulane.edu

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Issue

Vol. 117, Iss. 1 — 1 July 2016

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