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Tunable hyperbolic dispersion and negative refraction in natural electride materials

Tunable hyperbolic dispersion and negative refraction in natural electride materials

Hyperbolic (or indefinite) materials have attracted significant attention due to their unique capabilities for engineering electromagnetic space and controlling light propagation. A current challenge is to find a hyperbolic material with wide working frequency window, low energy loss, and easy controllability. Here, we propose that naturally existing electride materials could …