Bahamon Dario A, Gómez-Santos Guillermo, Efetov Dmitri K, Stauber Tobias
School of Engineering, Mackenzie Presbyterian University, São Paulo 01302-907, Brazil.
MackGraphe Graphene and Nanomaterials Research Institute, Mackenzie Presbyterian University, São Paulo 01302-907, Brazil.
Nano Lett. 2024 Apr 17;24(15):4478-4484. doi: 10.1021/acs.nanolett.4c00371. Epub 2024 Apr 8.
We propose minimal transport experiments in the coherent regime that can probe the chirality of twisted moiré structures. We show that only with a third contact and in the presence of an in-plane magnetic field (or another time-reversal symmetry breaking effect) a chiral system may display nonreciprocal transport in the linear regime. We then propose to use the third lead as a voltage probe and show that opposite enantiomers give rise to different voltage drops on the third lead. Additionally, in the scenario of layer-discriminating contacts, the third lead can serve as a current probe capable of detecting different handedness even in the absence of a magnetic field. In a complementary configuration, applying opposite voltages on the two layers of the third lead gives rise to a chiral (super)current in the absence of a source-drain voltage whose direction is determined by its chirality.
我们提出了在相干区域进行的最小输运实验，该实验可以探测扭曲莫尔结构的手性。我们表明，只有在存在第三个接触点且存在面内磁场（或另一种时间反演对称性破缺效应）的情况下，手性系统才可能在线性区域表现出非互易输运。然后我们建议将第三个引线用作电压探针，并表明相反的对映体在第三个引线上会产生不同的电压降。此外，在层分辨接触的情况下，即使在没有磁场的情况下，第三个引线也可以用作能够检测不同手性的电流探针。在一种互补配置中，在第三个引线的两层上施加相反的电压会在没有源漏电压的情况下产生手性（超）电流，其方向由其手性决定。
