论文标题
通过杂质效应的扭曲双层石墨烯中可能的绝缘阶段的分类和区分
Classification and Distinction of Possible Insulating Phases in Twisted Bilayer Graphene by Impurity Effects
论文作者
论文摘要
在这项工作中，研究了扭曲的双层石墨烯（TBG）各种绝缘阶段中杂质的影响。采用了良好接受的连续模型\ cite {b}，并计算状态的局部密度（DOS）。发现绝缘阶段破坏了以前的理论中提出的不同对称性\ cite {pa，op1，lee_2019}可以通过局部DOS中杂质引起的间隙结合状态峰的数量和特性来区分。绝缘阶段打破相同的先前提出的对称性可以通过剩余的反对称对称性进一步分类，并通过相应的剩余kramers脱位率进行区分。在扫描隧道显微镜（STM）实验中，可以检测到局部DOS中的间隙结合状态峰，并且可以原理检测到结合态的脱落性，因此可以帮助区分各种绝缘阶段。
In this work the effects of impurity in various insulating phases of the twisted bilayer graphene (TBG) are studied. The well-accepted continuum model\cite{b} is employed and the local density of states (DOS) is calculated. It is found that insulating phases breaking different symmetries proposed in previous theories\cite{pa,op1,Lee_2019} are distinguishable via the number and properties of in-gap bound state peaks induced by impurities in local DOS. Insulating phases breaking the same previously proposed symmetries can be further classified by the remaining anti-unitary symmetries and distinguished by the corresponding remaining Kramers degeneracy of bound states. The in-gap bound state peaks in local DOS and the degeneracy of the bound states can in principle be detected in scanning tunnelling microscopy (STM) experiments, and thus can help to the distinction of various insulating phases.
