双层石墨烯
凝聚态物理
石墨烯
朗道量子化
磁场
双层
物理
量子霍尔效应
量子力学
化学
膜
生物化学
作者
Hao-Hao Shi,Zhen Zhan,Zhikai Qi,Kaixiang Huang,Edo van Veen,José Ángel Silva-Guillén,Xianming Shi,Pengju Li,Kun Xie,Hengxing Ji,Mikhail I. Katsnelson,Shengjun Yuan,Shengyong Qin,Zhenyu Zhang
标识
DOI:10.1038/s41467-019-14207-w
摘要
Abstract A properly strained graphene monolayer or bilayer is expected to harbour periodic pseudo-magnetic fields with high symmetry, yet to date, a convincing demonstration of such pseudo-magnetic fields has been lacking, especially for bilayer graphene. Here, we report a definitive experimental proof for the existence of large-area, periodic pseudo-magnetic fields, as manifested by vortex lattices in commensurability with the moiré patterns of low-angle twisted bilayer graphene. The pseudo-magnetic fields are strong enough to confine the massive Dirac electrons into circularly localized pseudo-Landau levels, as observed by scanning tunneling microscopy/spectroscopy, and also corroborated by tight-binding calculations. We further demonstrate that the geometry, amplitude, and periodicity of the pseudo-magnetic fields can be fine-tuned by both the rotation angle and heterostrain. Collectively, the present study substantially enriches twisted bilayer graphene as a powerful enabling platform for exploration of new and exotic physical phenomena, including quantum valley Hall effects and quantum anomalous Hall effects.
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