Fig. 4: Universal even energy-momentum (ω-k) dispersions in isotope-homogenous hyperbolic systems. | Nature Communications

Fig. 4: Universal even energy-momentum (ω-k) dispersions in isotope-homogenous hyperbolic systems.

From: Van der Waals isotope heterostructures for engineering phonon polariton dispersions

Fig. 4

a–c The ω-k dispersions of naturally abundant hBN, h11BN, and h10BN, respectively. Thickness: 50 nm. Adjacent polariton branches are separated evenly by identical momentum ∆k (red arrows) in all panels. White dashed lines indicate the transverse optical (TO) phonon frequencies of naturally abundant hBN, h10BN, and h11BN, respectively. Various polariton branches are marked by N = 1, 0, and −1, etc.

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