论文标题
部分可观测时空混沌系统的无模型预测
Tuning the magnetic configuration of bilayer graphene quantum dot by twisting
论文作者
论文摘要
Twistronic最近引起了极大的关注，因为扭曲可以将双层石墨烯样材料设计成各种类型的强相关相。在本文中，我们研究了具有六边形形状和曲折边缘的双层石墨烯（BLG）量子点（QD）的扭曲。在未透视的BLG-QD中，石墨烯宿主自发磁性具有不同磁性构型的曲折边缘。作为绝热扭曲的BLG-QD，量子状态随扭角的函数而演变。如果扭曲角在某些临界值上变化，则量子状态的磁构型急剧变化。对于随着扭曲角度的增加或减小角度的扭曲过程，临界扭曲角的数量和值不同。因此，随着扭曲角的增加和来回减小的扭曲过程可能会进入磁滞循环。还研究了BLG QD用ADATOM的扭曲。扭曲的BLG-QD的磁性配置的调整功能可以应用于基于石墨烯的量子存储器设备。
Twistronic has recently attracted tremendous attention because the twisting can engineer the bilayer graphene-like materials into varying types of strongly correlated phases. In this paper, we study the twisting of bilayer graphene (BLG) quantum dots (QDs) with hexagonal shape and zigzag edges. In the untwisted BLG-QDs, the zigzag edges of graphene host spontaneous magnetism with varying magnetic configurations. As a BLG-QD being adiabatically twisted, the quantum state evolves as a function of the twisting angle. If the twisting angle changes across certain critical value, the magnetic configuration of the quantum state sharply changes. For the twisting process with increasing or decreasing twisting angle, the number and value of the critical twisting angles are different. Thus, the twisting process with the twisting angle increasing and decreasing back and forth could enter a hysteresis loop. The twisting of BLG QDs with adatom is also investigated. The tuning features of the magnetic configuration of the twisted BLG-QDs could be applied for graphene-based quantum memory devices.
