论文标题
在扭曲的双层石墨烯的魔法角度改变手性
Change of chirality at magic angles of twisted bilayer graphene
论文作者
论文摘要
我们得出了一个简单的公式，用于扭曲的双层石墨烯的真实空间手性，该公式可能与其板电流的跨产物有关。该数量显示了第一个远程频带定义明确的高原，作为栅极电压的函数，该函数近似于相应的扭曲角度。 Zeroth高原对应于第一个魔术角，由于出现的$ C_6 $ -SMEMEMEMERY，发生符号变化。我们的观察结果基于可观察到的宏观可观察到的魔法角度的新定义，该定义可在典型的运输实验中访问。
We derive a simple formula for the real-space chirality of twisted bilayer graphene that can be related to the cross-product of its sheet currents. This quantity shows well-defined plateaus for the first remote band as function of the gate voltage which are approximately quantized for commensurate twist angles. The zeroth plateau corresponds to the first magic angle where a sign change occurs due to an emergent $C_6$-symmetry. Our observation offers a new definition of the magic angle based on a macroscopic observable which is accessible in typical transport experiments.
