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arXiv · 1703.03550

New Group V Elemental Bilayers: A Tunable Structure Model with 4,6,8-atom Rings

Xiangru Kong·Linyang Li·Ortwin Leenaerts·Xiong-jun Liu·François M. Peeters
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Abstract

Two-dimensional (2D) group V elemental materials have attracted widespread attention due to their nonzero band gap while displaying high electron mobility. Using first-principles calculations, we propose a series of new elemental bilayers with group V elements (Bi, Sb, As). Our study reveals the dynamical stability of 4, 6, and 8-atom ring structures, demonstrating their possible coexistence in such bilayer systems. The proposed structures for Sb and As are large-gap semiconductors that are potentially interesting for applications in future nanodevices. The Bi structures have nontrivial topological properties with a large and direct nontrivial band gap. The nontrivial gap is shown to arise from a band inversion at the Brillouin zone center due to the strong intrinsic spin-orbit coupling (SOC) in Bi atoms. Moreover, we demonstrate the possibility to tune the properties of these materials by enhancing the ratio of 6-atom rings to 4 and 8-atom rings, which results in wider nontrivial band gaps and lower formation energies.

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Xiangru Kong, Linyang Li, Ortwin Leenaerts, Xiong-jun Liu, François M. Peeters. 2017-03-10. New Group V Elemental Bilayers: A Tunable Structure Model with 4,6,8-atom Rings. https://doi.org/10.1103/physrevb.96.035123

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