Gypsum thin films support hyperbolic, canalized, and elliptical shear phonon polaritons, with a topological transition between regimes and group velocities down to 0.0005c.
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Visualization of topological shear polaritons in gypsum thin films
Gypsum thin films support hyperbolic, canalized, and elliptical shear phonon polaritons, with a topological transition between regimes and group velocities down to 0.0005c.