期刊
NANO LETTERS
卷 20, 期 7, 页码 5301-5308出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01627
关键词
Phonon polaritons; hyperbolic materials; van der Waals materials; twisted double-layers; in-plane hyperbolicity
类别
资金
- National Natural Science Foundation of China [91963205, 11904420, 51702372]
- National Key Basic Research Program of China [2019YFA0210200, 2019YFA0210203]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2014A030306017]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011355, 2020A1515011329]
- Changjiang Young Scholar Program - China Postdoctoral Science Foundation [2019M663199]
Controlling the twist angle between two stacked van der Waals (vdW) crystals is a powerful approach for tuning their electronic and photonic properties. Hyperbolic media have recently attracted much attention due to their ability to tailor electromagnetic waves at the subwavelength-scale which, however, usually requires complex patterning procedures. Here, we demonstrate a lithography-free approach for manipulating the hyperbolicity by harnessing the twist-dependent coupling of phonon polaritons in double-layers of vdW alpha-MoO3, a naturally biaxial hyperbolic crystal. The polariton isofrequency contours can be modified due to this interlayer coupling, allowing for controlling the polaritonic characteristics by adjusting the orientation angles between the two layers. Our findings provide opportunities for control of nanoscale light flow with twisted stacks of vdW crystals.
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