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Infrared plasmons propagate through a hyperbolic nodal metal

https://doi.org/10.1126/sciadv.add6169

Shao, Yinming ; Sternbach, Aaron J. ; Kim, Brian S. ; Rikhter, Andrey A. ; Xu, Xinyi ; De Giovannini, Umberto ; Jing, Ran ; Chae, Sang Hoon ; Sun, Zhiyuan ; Lee, Seng Huat ; et al ( October 2022 , Science Advances)

Nodal-line metals allow hyperbolic infrared waveguiding through the bulk with band structure–engineered loss reduction.
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Visualization of moiré superlattices

https://doi.org/10.1038/s41565-020-0708-3

McGilly, Leo J. ; Kerelsky, Alexander ; Finney, Nathan R. ; Shapovalov, Konstantin ; Shih, En-Min ; Ghiotto, Augusto ; Zeng, Yihang ; Moore, Samuel L. ; Wu, Wenjing ; Bai, Yusong ; et al ( July 2020 , Nature Nanotechnology)
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Strong Metasurface–Josephson Plasma Resonance Coupling in Superconducting La 2− x Sr x CuO 4

https://doi.org/10.1002/adom.201900712

Schalch, Jacob S. ; Post, Kirk ; Duan, Guangwu ; Zhao, Xiaoguang ; Kim, Young Duck ; Hone, James ; Fogler, Michael M. ; Zhang, Xin ; Basov, Dmitri N. ; Averitt, Richard D. ( August 2019 , Advanced Optical Materials)

Abstract
Terahertz spectroscopy of thec‐axis Josephson plasma resonance (JPR) in high‐temperature cuprates is a powerful probe of superconductivity, providing a route to couple to and interact with the condensate. Electromagnetic coupling between metasurface arrays of split ring resonators (SRRs) and the JPR of a La₂₋_xSr_xCuO₄single crystal (T_c= 32 K) is investigated. The metasurface resonance frequency (ω_MM), determined by the SRR geometry, is swept through the JPR frequency (ω_JPR= 1.53 THz) using a series of interchangeable tapes applied to the same single crystal. Terahertz reflectivity measurements on the resulting hybrid superconducting metamaterials (HSMMs) reveal anticrossing behavior characteristic of strong coupling. The experimental results, validated with numerical simulations, indicate a normalized Rabi frequency of Ω_R= 0.29. Further, it is shown that HSMMs with ω_MM> ω_JPRprovide a route to couple to hyperbolic waveguide modes inc‐axis cuprate samples. This work informs future possibilities for optimizing the coupling strength of HSMMs and investigating nonlinear superconductivity under high field terahertz excitation.

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