Twist‑polaritonics offers exact management of light-matter states via the stacking of atomically easy, anisotropic layers however has been restricted to van der Waals (vdW) crystals. Non‑vdW crystals, regardless of their symmetry‑damaged dielectric responses very best for unique polaritons, are tough to skinny into appropriate flakes as a result of their inflexible 3D bonding networks, thus limiting the implementation of deep‑subwavelength twist‑polaritonics. Right here, we set up a non‑vdW polaritonic platform utilizing ultrathin, single‑crystalline β‑Ga₂O₃ nanoflakes synthesized by exploiting its anisotropic bonding hierarchy on the quasi‑layered (100)B airplane. These flakes exhibit deep‑subwavelength polariton confinement past λ/20. Furthermore, their atomic‑scale flatness allows the meeting of twisted bilayers, by which we observe a topological transition of the polariton dispersion from hyperbolic to elliptical, straight managed by the twist angle. This work positions β-Ga₂O₃ as a high-performance nanophotonic platform past the vdW household, whereas proposing that anisotropic bonding hierarchy offers a common technique to unlock non-vdW twist‑polaritonic performance in a variety of bulk crystals.
