Tuning polaritons in van der Waals moiré superlattices with interlayer spacing
Tuning polaritons in van der Waals moiré superlattices with interlayer spacing
复制标题
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
中科院分区:
文献类型:
--
作者:
Xinyu Lv;Lu Wen;Zhenbing Dai;Guoyu Luo;Zhiqiang Li
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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