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  • Title: Theoretical prediction of HfB2 monolayer, a two-dimensional Dirac cone material with remarkable Fermi velocity.
    Author: Liu Z, Wang P, Cui Q, Yang G, Jin S, Xiong K.
    Journal: RSC Adv; 2019 Jan 18; 9(5):2740-2745. PubMed ID: 35520500.
    Abstract:
    Searching for new two-dimensional (2D) Dirac cone materials has been popular since the discovery of graphene with a Dirac cone structure. Based on density functional theory (DFT) calculations, we theoretically designed a HfB2 monolayer as a new 2D Dirac material by introducing the transition metal Hf into a graphene-like boron framework. This newly predicted HfB2 monolayer has pronounced thermal and kinetic stabilities along with a Dirac cone with a massless Dirac fermion and Fermi velocities (3.59 × 105 and 6.15 × 105 m s-1) comparable to that of graphene (8.2 × 105 m s-1). This study enriches the diversity and promotes the application of 2D Dirac cone materials.
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