Active tuning of highly anisotropic phonon polaritons in van der Waals crystal slabs by gated graphene

Gonzalo Álvarez-Pérez, Arturo González-Morán, Nathaniel Capote-Robayna +5

Phonon polaritons (PhPs) -- lattice vibrations coupled to electromagnetic fields -- in highly anisotropic media display a plethora of intriguing optical phenomena (including ray-li…