Seeing Dirac electrons and heavy fermions in new boron nitride monolayers

doi:10.1088/1674-1056/ab7e9e

Abstract Most three-dimensional (3D) and two-dimensional (2D) boron nitride (BN) structures are wide-band-gap insulators. Here, we propose two BN monolayers having Dirac points and flat bands, respectively. One monolayer is named as 5-7 BN that consists of five- and seven-membered rings. The other is a Kagome BN made of triangular boron rings and nitrogen dimers. The two structures show not only good dynamic and thermodynamic stabilities but also novel electronic properties. The 5-7 BN has Dirac points on the Fermi level, indicating that the structure is a typical Dirac material. The Kagome BN has double flat bands just below the Fermi level, and thus there are heavy fermions in the structure. The flat-band-induced ferromagnetism is also revealed. We analyze the origination of the band structures by partial density of states and projection of orbitals. In addition, a possible route to experimentally grow the two structures on some suitable substrates such as the PbO₂ (111) surface and the CdO (111) surface is also discussed, respectively. Our research not only extends understanding on the electronic properties of BN structures, but also may expand the applications of BN materials in 2D electronic devices.

Keywords: boron nitride Dirac fermion flat band ferromagnetism

Received: 15 February 2020
Revised: 05 March 2020
Accepted manuscript online:

PACS:	73.22.-f	(Electronic structure of nanoscale materials and related systems)
	73.43.Cd	(Theory and modeling)
	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11874314) and the Natural Science Foundation of Hunan Province, China (Grant No. 2018JJ2377).

Corresponding Authors: Yue-E Xie
E-mail: yueex@ujs.edu.cn

Cite this article:

Yu-Jiao Kang(康玉娇), Yuan-Ping Chen(陈元平), Jia-Ren Yuan(袁加仁), Xiao-Hong Yan(颜晓红), Yue-E Xie(谢月娥) Seeing Dirac electrons and heavy fermions in new boron nitride monolayers 2020 Chin. Phys. B 29 057303

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Seeing Dirac electrons and heavy fermions in new boron nitride monolayers

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