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Observation of Chiral and Slow Plasmons in Twisted Bilayer Graphene by Tianye Huang; Xuecou Tu; Changqing Shen; Binjie Zheng; Junzhuan Wang; Hao Wang; Kaveh Khaliji; Sang Hyun Park; Zhiyong Liu; Teng Yang; Zhidong Zhang; Lei Shao; Xuesong Li; Tony Low; Yi Shi; Xiaomu Wang is a Physics and Astronomy article available to read on EtoBox.
What is Observation of Chiral and Slow Plasmons in Twisted Bilayer Graphene about?
Moiré superlattices have led to observations of exotic emergent electronic properties such as superconductivity and strong correlated states in small-rotation-angle twisted bilayer graphene (tBLG). Recently, these findings have inspired the search for new properties in moiré plasmons. Although plasmon propagation in the tBLG basal plane has been studied by near-field nano-imaging techniques, the general electromagnetic character and properties of these plasmons remain elusive. Here we report the direct observation of two new plasmon modes in macroscopic tBLG with a highly ordered moiré superlattice. Using spiral structured nanoribbons of tBLG, we identify signatures of chiral plasmons that arise owing to the uncompensated Berry flux of the electron gas under optical pumping. The salient features of these chiral plasmons are shown through their dependence on optical pumping intensity and electron fillings, in conjunction with distinct resonance splitting and Faraday rotation coinciding with the spectral window of maximal Berry flux. Moreover, we also identify a slow plasmonic mode around 0.4 electronvolts, which stems from the interband transitions between the nested subbands in lat
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It is typically read by researchers, students, and practitioners in Physics and Astronomy.
- Author
- Tianye Huang; Xuecou Tu; Changqing Shen; Binjie Zheng; Junzhuan Wang; Hao Wang; Kaveh Khaliji; Sang Hyun Park; Zhiyong Liu; Teng Yang; Zhidong Zhang; Lei Shao; Xuesong Li; Tony Low; Yi Shi; Xiaomu Wang
- Publisher
- Springer Science and Business Media LLC
- Published
- 2022
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)