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arXiv · 2201.01412

Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals

Yali Zeng·Qingdong Ou·Lu Liu·Chunqi Zheng·Ziyu Wang·Youning Gong·Xiang Liang·Yupeng Zhang·Guangwei Hu·Zhilin Yang·Cheng-Wei Qiu·Qiaoliang Bao·Huanyang Chen·Zhigao Dai
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Abstract

Polaritons in polar biaxial crystals with extreme anisotropy offer a promising route to manipulate nanoscale light-matter interactions. The dynamical modulation of their dispersion is great significance for future integrated nano-optics but remains challenging. Here, we report a momentum-directed strategy, a coupling between the modes with extra momentum supported by the interface and in-plane hyperbolic polaritons, to tailor topological transitions of anisotropic polaritons in biaxial crystals. We experimentally demonstrate such tailored polaritons at the interface of heterostructures between graphene and {\alpha}-phase molybdenum trioxide ({\alpha}-MoO3). The interlayer coupling can be electrically modulated by changing the Fermi level in graphene, enabling a dynamic topological transition. More interestingly, we found that the topological transition occurs at a constant Fermi level when tuning the thickness of {\alpha}-MoO3. The momentum-directed strategy implemented by interface engineering offers new insights for optical topological transitions, which may shed new light for programmable polaritonics, energy transfer and neuromorphic photonics.

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physics.opticscond-mat.mes-hallcond-mat.mtrl-sci

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Yali Zeng, Qingdong Ou, Lu Liu, Chunqi Zheng, Ziyu Wang, Youning Gong, Xiang Liang, Yupeng Zhang, Guangwei Hu, Zhilin Yang, Cheng-Wei Qiu, Qiaoliang Bao, Huanyang Chen, Zhigao Dai. 2022-01-05. Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals. https://doi.org/10.1021/acs.nanolett.2c00399

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