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Liu, Zhongfei; Wang, Peihong; Cui, Qiaoyu; Yang, Guang; Jin, Shaowei; Xiong, Kuangwei
RSC advances, 01/2019, Volume: 9, Issue: 5Journal Article
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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