Observation of Type-II Topological Nodal-Line Fermions in ZrSiSe

Zhao, M and Zhuang, Z-Y and Wu, F and Leng, P and Joseph, NB and Xie, X and Ozerov, M and He, S and Chen, Y and Narayan, A and Liu, Z and Xiu, F (2024) Observation of Type-II Topological Nodal-Line Fermions in ZrSiSe. In: ACS Nano .

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Abstract

Recently, there has been significant interest in topological nodal-line semimetals due to their linear energy dispersion with one-dimensional nodal lines or loops. These materials exhibit fascinating physical properties, such as drumhead surface states and 3D anisotropic nodal-line structures. Similar to Weyl semimetals, type-II nodal-line semimetals have two crossing bands that are both electron-like or hole-like along a certain direction. However, the direct observation of type-II nodal-line Fermions has been challenging due to the lack of suitable material platforms and the low density of states. Here we present experimental evidence for the coexistence of both type-I and type-II nodal-line Fermions in ZrSiSe, which was obtained through magneto-optical and angle-resolved photoemission spectroscopy (ARPES) measurements. Our density functional theory calculations predict that the type-II nodal-line structure can be developed in the Z-R line of the first Brillouin zone based on the lattice constants of the grown single crystal. Indeed, ARPES measurements reveal the type-II nodal-line band structure. The extracted type-II Landau level transitions from magneto-optical measurements exhibit good agreement with the calculated type-II energy dispersion model based on the band structure. Our experimental results demonstrate that ZrSiSe possesses two types of nodal-line Fermions, distinguishing it from other ZrSiX (X = S, Te) materials and positioning it as an ideal platform for investigating type-II nodal-line semimetals. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Nano
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Band structure; Density functional theory; Germanium compounds; Lattice constants; Optical data processing; Photoelectron spectroscopy; Selenium compounds; Silicon compounds; Single crystals; Tellurium compounds; Zirconium compounds, Landau level transition; Landau levels; Level transition; Lines structures; Magneto-optical spectra; Nodal line; Nodal-line semimetal; Two type of nodal-line structure; Type II, Topology
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	31 Jul 2024 05:18
Last Modified:	31 Jul 2024 05:18
URI:	http://eprints.iisc.ac.in/id/eprint/85741

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