Gallium bismuth halide GaBi-X2 (X =I, Br, Cl) monolayers with distorted hexagonal framewor

Gallium bismuth halide GaBi-X2 (X =I, Br, Cl) monolayers with distorted hexagonal framework: Novel room-temperature quantum spin Hall

insulators

Linyang Li;Ortwin Leenaerts;Xiangru Kong;Xin Chen;Mingwen Zhao;Fran(c)ois M.Peeters

【期刊名称】《纳米研究（英文版）》 【年(卷),期】2017(010)006

【摘要】Quantum spin Hall (QSH) insulators with a large topologically nontrivial bulk gap are crucial for future applications of the QSH effect.Among these,group Ⅲ-Ⅴ monolayers and their halides,which have a chair structure (regular hexagonal framework),have been widely studied.Using first-principles calculations,we formulate a new structure model for the functionalized group Ⅲ-Ⅴ monolayers,which consist of rectangular GaBi-X2 (X =I,Br,Cl) monolayers with a distorted hexagonal framework (DHF).These structures have a far lower energy than the GaBi-X2 monolayers with a chair structure.Remarkably,the DHF GaBi-X2 monolayers are all QSH insulators,which exhibit sizeable nontrivial band gaps ranging from 0.17 to 0.39 eV.The band gaps can be widely tuned by applying different spin-orbit coupling strengths,resulting in a distorted Dirac cone. 【总页数】13页(2168-2180)

【关键词】

【作者】Linyang Li;Ortwin Leenaerts;Xiangru Kong;Xin Chen;Mingwen Zhao;Fran(c)ois M.Peeters

【作者单位】Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;International Center for Quantum Materials, Peking University, Beijing 100871, China;School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_nano-research-english_thesis/0201243341149.html 【相关文献】

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