典型文献
Strain induced topological transitions in twisted double bilayer graphene
文献摘要：
We theoretically study the band structures and the valley Chern numbers of the AB-AB and AB-BA stacked twisted double bilayer graphene under heterostrain effect.In the absence of heterostrain,due to the constrains by the spatial symmetries,the central two flat bands of the AB-AB are topological trivial bands,while in the AB-BA they have a finite Chern number.The heterostrain breaks all the point group symmetries and the constrains are lifted,hence the topological properties of the two arrangements can be tuned by different strain magnitudes ε and directions φ.The heterostrain has dissimilar impacts on the Chern numbers of the AB-AB and AB-BA,owing to their different band gaps,and these gaps can be modified by a vertical electric field.Our results show that the topological transitions for both arrangements occur in the e range of 0.1％-0.4％,which can be realized in the graphene-based sample.
文献关键词：
中图分类号：
作者姓名：
Guoyu Luo;Xinyu Lv;Lu Wen;Zhiqiang Li;Zhenbing Dai
作者机构：
College of Physics,Sichuan University,Chengdu 610064,China;Department of Physics,Sichuan Normal University,Chengdu 610066,China
文献出处：
引用格式：
[1]Guoyu Luo;Xinyu Lv;Lu Wen;Zhiqiang Li;Zhenbing Dai-.Strain induced topological transitions in twisted double bilayer graphene)[J].物理学前沿,2022(02):82-90
A类：
heterostrain
B类：
Strain,induced,topological,transitions,twisted,double,bilayer,graphene,We,theoretically,study,structures,valley,Chern,numbers,AB,BA,stacked,under,effect,In,absence,due,constrains,by,spatial,symmetries,central,two,flat,bands,are,trivial,while,they,have,finite,breaks,point,group,lifted,hence,properties,arrangements,can,tuned,different,magnitudes,directions,has,dissimilar,impacts,owing,their,gaps,these,modified,vertical,electric,field,Our,results,show,that,both,occur,which,realized,sample
AB值：
0.50363
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