A sodium-intercalated √7×√7 Moiré stack of hexagonal boron nitride is predicted to support plasmons that avoid first-order electron-phonon decay in a narrow 1.08 to 1.16 eV window, with electron-electron scattering setting the actual lifetime at about 10^14 s^-1.
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Alkali Intercalation of Moire Heterostructures for Low-Loss Plasmonics
A sodium-intercalated √7×√7 Moiré stack of hexagonal boron nitride is predicted to support plasmons that avoid first-order electron-phonon decay in a narrow 1.08 to 1.16 eV window, with electron-electron scattering setting the actual lifetime at about 10^14 s^-1.