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Bibliographic Details
Main Authors:	Taboada-Gutiérrez, Javier, Álvarez-Pérez, Gonzalo, Duan, Jiahua, Ma, Weiliang, Crowley, Kyle, Prieto, Iván, Bylinkin, Andrei, Autore, Marta, Volkova, Halyna, Kimura, Kenta, Kimura, Tsuyoshi, Berger, M. -H., Li, Shaojuan, Bao, Qiaoliang, Gao, Xuan P. A., Errea, Ion, Nikitin, Alexey, Hillenbrand, Rainer, Martín-Sánchez, Javier, Alonso-González, Pablo
Format:	Preprint
Published:	2025
Subjects:	Optics Materials Science
Online Access:	https://arxiv.org/abs/2501.08705
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Phonon polaritons (PhPs) -- light coupled to lattice vibrations -- in polar van der Waals (vdW) crystals are promising candidates for controlling the flow of energy at the nanoscale due to their strong field confinement, anisotropic propagation, and ultra-long lifetime in the picosecond range \cite{ref1,ref2,ref3,ref4,ref5}. However, the lack of tunability in their narrow and material-specific spectral range -- the Reststrahlen Band (RB) -- severely limits their technological implementation. Here, we demonstrate that the intercalation of Na atoms in the vdW semiconductor $α$-V$_2$O$_5$ enables a broad spectral shift of RBs, and that the PhPs excited exhibit ultra-low losses (lifetime of $4 \pm 1$~ps), similar to PhPs in the non-intercalated crystal (lifetime of $6 \pm 1$ ps). We expect our intercalation method to be applicable to other vdW crystals, opening the door for the use of PhPs in broad spectral bands in the mid-infrared domain.

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