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Coexistence of Open and Closed Type Nodal lines Topological Semimetals in Two Dimensional B$_2$C

Abstract

Topological semimetals, including Dirac semimetals, Weyl semimetals, and nodal line semimetals, receive enormous research interest due to their intrinsic topological nature and fascinating properties. In present work, with the help of density functional theory (DFT), we find that nodal line semimetals and Dirac semimetals can coexist in the low energy electron of two dimensional (2D) monolayer B$_2$C. Intriguingly, besides type-I and type-II Dirac fermions, a kind of open nodal line appears around the Fermi level. The low energy electronic nature of B$_2$C sheet can be described by a tight-binding (TB) model relied on the basis of B-p$_y$, p$_z$ and C-p$_y$, p$_z$ states. One of the most merit of the system is that the energy windows of these four types topological semimetals are different that can be easily distinguished in experiments. Moreover, the system provides an excellent platform for studying the interplay between different type semimetals.

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Publication details

The article was received on 08 Nov 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC05095J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Coexistence of Open and Closed Type Nodal lines Topological Semimetals in Two Dimensional B$_2$C

    P. Zhou, Z. Ma and L. Sun, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05095J

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