Hyperbolic-to-hyperbolic transition at exceptional Reststrahlen point in rare-earth oxyorthosilicates

Chunqi Zheng, Guangwei Hu, Jingxuan Wei, Xuezhi Ma, Zhipeng Li, Yinzhu Chen, Zhenhua Ni, Peining Li, Qian Wang () and Cheng-Wei Qiu ()
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Chunqi Zheng: National University of Singapore
Guangwei Hu: Nanyang Technological University
Jingxuan Wei: National University of Singapore
Xuezhi Ma: Agency for Science, Technology and Research (A*STAR)
Zhipeng Li: Agency for Science, Technology and Research (A*STAR)
Yinzhu Chen: National University of Singapore
Zhenhua Ni: School of Physics, Southeast University
Peining Li: Huazhong University of Science and Technology
Qian Wang: Agency for Science, Technology and Research (A*STAR)
Cheng-Wei Qiu: National University of Singapore

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Anisotropic optical crystals can exhibit a hyperbolic response within the Reststrahlen band (RB) and support directional polaritonic propagations when interacting with light. Most of the reported low-symmetry optical crystals showcase the evolution from hyperbolic to elliptic dispersion topologies, largely owing to their adjacent RBs being either overlapped or separated. Here, we report an exceptional Reststrahlen point (ERP) in rare-earth oxyorthosilicate Y2SiO5, at which two neighboring RBs almost kiss each other. Consequently, we observe the direct hyperbolic-to-hyperbolic topological transition: the hyperbolic branches close and reopen along with the rotating transverse axis (TA). At such ERP, the TA merges to the direction orthogonal to its proximate phonon mode, mainly due to the interplay between these two non-orthogonal phonon modes. We also find that even with the existence of only one single RB, the TA can rotate in-plane. Our findings are prevalent in isostructural rare-earth oxyorthosilicates, such as Lu2SiO5. The universally underlying physics of ERP and its corresponding special class of rare-earth oxyorthosilicates may offer playgrounds for continuously tuning phonon polariton propagation direction, and broadband controlling light dispersion of polaritonic nanodevices.

Date: 2024
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DOI: 10.1038/s41467-024-50939-0

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