Tuning polaritons in van der Waals moiré superlattices with interlayer spacing

Tuning polaritons in van der Waals moiré superlattices with interlayer spacing
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通过层间距调节范德华莫尔超晶格中的极化子

DOI:
10.1063/5.0091952
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发表时间:
2022-08
影响因子:
4
通讯作者:
Zhiqiang Li
Zhiqiang Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xinyu Lv;Lu Wen;Zhenbing Dai;Guoyu Luo;Zhiqiang Li

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理论研究了不同层间距的扭曲双层石墨烯(TBG)与六方氮化硼(hBN)组成的货车德瓦尔斯异质结构中声子极化激元的干涉和传播。我们发现,改变层间距,因此,层间耦合强度的结果在TBG的畴壁(DW),这导致显着的变化在DW附近的极化激元干涉配置文件的局部光学电导率的显着修改。此外,我们的模拟表明,极化激元在hBN/TBG异质结构中传播产生的二维近场干涉图案可以显着改变层间距和超晶格周期。我们的研究表明,将层间距修改与莫尔超晶格相结合是在纳米尺度上控制光和设计具有可调功能的纳米光子器件的有价值的途径。
We theoretically study the interference and propagation of phonon polaritons in hexagonal boron nitride (hBN) in van der Waals heterostructures composed of hBN and twisted bilayer graphene (TBG) with different interlayer spacing in TBG. We show that varying the interlayer spacing and, hence, the interlayer coupling strength results in dramatic modifications of the local optical conductivity at the domain walls (DWs) in TBG, which leads to significant changes in the polariton interference profile near DWs. Moreover, our simulation reveals that the two-dimensional near-field interference pattern generated by polariton propagation in hBN/TBG heterostructures can be dramatically changed by interlayer spacing and the superlattice period. Our study demonstrates that combining interlayer spacing modification with moiré superlattices is a valuable route to control light at the nanoscale and design nanophotonic devices with tunable functionalities.
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