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26 April 2024 |
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Article overview
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Hexagonal supertetrahedral boron: A topological metal with multiple spin-orbit-free emergent fermions | | Yan Gao
; Weikang Wu
; Peng-Jie Guo
; Chengyong Zhong
; Shengyuan A. Yang
; Kai Liu
; Zhong-Yi Lu
; | | Date: |
24 Jan 2019 | | Abstract: | We predict a new three-dimensional (3D) boron allotrope based on systematic
first-principles electronic structure calculations. This allotrope can be
derived by substituting each carbon atom in a hexagonal diamond lattice with a
B$_{4}$ tetrahedron and possesses the same space group $P6_{3}/mmc$ as
hexagonal diamond, hence it is termed as H-boron. We show that H-boron has good
stability and excellent mechanical property. Remarkably, we find that H-boron
is a topological metal with rich types of spin-orbit-free emergent fermions,
including semi-Dirac fermion, quadratic and linear triple-point fermion,
nodal-line fermion, and nodal-surface fermion. We clarify their symmetry
protections and characterize them by constructing the corresponding low-energy
effective models. Our work not only discovers a new boron allotrope with
excellent properties, it also offers a platform to explore interesting physics
of new kinds of emergent fermions. | | Source: | arXiv, 1901.8413 | | Services: | Forum | Review | PDF | Favorites | |
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