Network model and four-terminal transport in minimally twisted bilayer graphene
Network model and four-terminal transport in minimally twisted bilayer graphene
复制标题
最小扭曲双层石墨烯的网络模型和四端传输
DOI：
10.1103/physrevb.104.195410
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发表时间：
2021
影响因子：
3.7
通讯作者：
P. Recher
中科院分区：
文献类型：
--
作者：
C. De Beule;F. Domínguez;P. Recher
我们从对称性的角度出发，构建了层间偏置最小扭曲双层石墨烯中谷霍尔态三角网络的双通道散射模型，并研究了四端结构中的电子输运.当网络主机手征锯齿模式，AharonovBohm共振出现在纵向电导在垂直磁场或面内电场的存在下。有趣的是，我们发现，当同时施加磁场和面内电场时，不同之字形分支的共振被分裂，这对电场的方向很敏感。我们进一步证明，虽然霍尔响应在手征之字形区域中消失，但通过弱耦合不同的之字形分支，在不破坏纵向响应中的阿哈罗诺夫-波姆共振的情况下获得了有限的霍尔响应，这也引起了现实磁场下的霍夫斯塔特物理学。
We construct a two-channel scattering model for the triangular network of valley Hall states in interlayer-biased minimally twisted bilayer graphene from symmetry arguments and investigate electronic transport in a four-terminal setup. When the network hosts chiral zigzag modes, AharonovBohm resonances appear in the longitudinal conductance in the presence of a perpendicular magnetic field or an in-plane electric field. Interestingly, we find that when both a magnetic field and an inplane electric field are applied, resonances of different zigzag branches are split, which is sensitive to the direction of the electric field. We further demonstrate that while the Hall response vanishes in the chiral zigzag regime, a finite Hall response is obtained without destroying the Aharonov-Bohm resonances in the longitudinal response, by weakly coupling different zigzag branches, which also gives rise to Hofstadter physics at realistic magnetic fields.
影响因子：
41.2
作者：
Yoo, Hyobin;Engelke, Rebecca;Kim, Philip
通讯作者：
Kim, Philip