Unusual phase transition of layer-stacked borophene under pressure
Abstract
The 8-Pmmn borophene, a boron analogue of graphene, hosts tilted and anisotropic massless Dirac fermion quasiparticles owing to the presence of the distorted graphene-like sublattice. First-principles calculations show that the stacked 8-Pmmn borophene is transformed into the fused three-dimensional borophene under pressure, being accompanied by the partially bond-breaking and bond-reforming. Strikingly, the fused 8-Pmmn borophene inherits the Dirac band dispersion resulting in an unusual semimetal-semimetal transition. A simple tight-binding model derived from graphene qualitatively reveals the underlying physics due to the maximum preservation of graphene-like substructure after the phase transition, which contrasts greatly to the transformation of graphite into diamond associated with the semimetal-insulator transition.
Keywords
Cite
@article{arxiv.2111.15334,
title = {Unusual phase transition of layer-stacked borophene under pressure},
author = {Xiao-Ji Weng and QuanSheng Wu and Xi Shao and Oleg V. Yazyev and Xin-Ling He and Xiao Dong and Hui-Tian Wang and Xiang-Feng Zhou and Yongjun Tian},
journal= {arXiv preprint arXiv:2111.15334},
year = {2022}
}
Comments
6 pages, 4 figures