Prediction of Quantum Anomalous Hall Insulator in half-fluorinated GaBi Honeycomb

Prediction of Quantum Anomalous Hall Insulator in half-fluorinated GaBi Honeycomb

Using first-principles electronic structure calculations, we predict half-fluorinated GaBi honeycomb under tensile strain to harbor a quantum anomalous Hall (QAH) insulator phase. We show that this QAH phase is driven by a single inversion in the band structure at the Γ point. Moreover, we have comp...

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Bibliographic Details
Main Authors: Chen, Sung-Ping, Huang, Zhi-Quan, Crisostomo, Christian P., Hsu, Chia-Hsiu, Chuang, Feng-Chuan, Lin, Hsin, Bansil, Arun
Format: Online
Language:English
Published: Nature Publishing Group 2016
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979090/
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Summary:Using first-principles electronic structure calculations, we predict half-fluorinated GaBi honeycomb under tensile strain to harbor a quantum anomalous Hall (QAH) insulator phase. We show that this QAH phase is driven by a single inversion in the band structure at the Γ point. Moreover, we have computed the electronic spectrum of a half-fluorinated GaBi nanoribbon with zigzag edges, which shows that only one edge band crosses the Fermi level within the band gap. Our results suggest that half-fluorination of the GaBi honeycomb under tensile strain could provide a new platform for developing novel spintronics devices based on the QAH effect.

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