Probing the wave functions of correlated states in magic angle graphene
Probing the wave functions of correlated states in magic angle graphene
复制标题
探讨魔角石墨烯中相关态的波函数
DOI：
10.1103/physrevresearch.2.033181
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发表时间：
2020
影响因子：
4.2
通讯作者：
LeRoy, Brian J.
中科院分区：
文献类型：
--
作者：
Zhang, Zhiming;Myers, Rachel;Watanabe, Kenji;Taniguchi, Takashi;LeRoy, Brian J.
利用扫描探针显微镜和光谱学，我们探索了扭曲双层石墨烯在1.1°“魔角”处的电子波函数的空间对称性。这种小的扭转角导致13 nm量级的长波长莫尔晶胞和两个平坦带的出现。随着扭转角的减小，相关效应增加，直到它们在魔角处最大化。在这个角度下，由于电荷有序态的出现，电荷中性点处的波函数显示出降低的对称性。当系统被掺杂时，波函数的对称性在莫尔晶胞的每个相称填充处改变，指向自旋和谷简并破缺态的相关性质。
Using scanning probe microscopy and spectroscopy, we explore the spatial symmetry of the electronic wave functions of twisted bilayer graphene at the “magic angle” of 1.1°. This small twist angle leads to a long wavelength moiré unit cell on the order of 13 nm and the appearance of two flat bands. As the twist angle is decreased, correlation effects increase until they are maximized at the magic angle. At this angle, the wave functions at the charge neutrality point show reduced symmetry due to the emergence of a charge ordered state. As the system is doped, the symmetry of the wave functions changes at each commensurate filling of the moiré unit cell pointing to the correlated nature of the spin and valley degeneracy broken states.
影响因子：
64.8
作者：
Xie, Yonglong;Lian, Biao;Yazdani, Ali
通讯作者：
Yazdani, Ali