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A non-van der Waals platform for deep-subwavelength twist-polaritonics based on β-Ga₂O₃ nanoflakes
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DOI：10.1039/D6NH00044D.png)
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Abstract
En 中文
Twist‑polaritonics provides precise control of light-matter states through the stacking of atomically smooth; anisotropic layers but has been restricted to van der Waals (vdW) crystals. Non‑vdW crystals; despite their symmetry‑broken dielectric responses ideal for exotic polaritons; are difficult to thin into suitable flakes due to their rigid 3D bonding networks; thus limiting the implementation of deep‑subwavelength twist‑polaritonics. Here; we establish a non‑vdW polaritonic platform using ultrathin; single‑crystalline β‑Ga₂O₃ nanoflakes synthesized by exploiting its anisotropic bonding hierarchy on the quasi‑layered (100)B plane. These flakes exhibit deep‑subwavelength polariton confinement beyond λ/20. Moreover; their atomic‑scale flatness enables the assembly of twisted bilayers; in which we observe a topological transition of the polariton dispersion from hyperbolic to elliptical; directly controlled by the twist angle. This work positions β-Ga₂O₃ as a high-performance nanophotonic platform beyond the vdW family; while proposing that anisotropic bonding hierarchy provides a general strategy to unlock non-vdW twist‑polaritonic functionality in a wide range of bulk crystals.
Keywords:
twist-polaritonics
β-Ga₂O₃ nanoflakes
non-van der Waals crystals
deep-subwavelength confinement
polariton dispersion
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