engleski

Tunable Low-Loss Hyperbolic Plasmon Polaritons in a Td - WTe2 Single Layer

Natural hyperbolic two-dimensional systems are a fascinating class of materials that could open alternative pathways to the manipulation of plasmon propagation and light-matter interactions. Here, we present a comprehensive study of the optical response in Td-WTe2 by means of density-functional and many-body perturbation theories. We show how monolayer WTe2 with in-plane anisotropy sustains hyperbolic plasmon polaritons, which can be tuned via chemical doping and strain. The latter is able to extend the hyperbolic regime toward the near infrared with low losses. Moreover, with a moderate strain, WTe2 can even be switched between elliptic and hyperbolic regimes. In addition, plasmons in WTe2 are characterized by low losses owing to electron-phonon scattering, which is responsible for the temperature dependence of the plasmon line width. Interestingly, the temperature can also be utilized to tune the in-plane anisotropy of the WTe2 optical response.

Hyperbolic plasmons, electron-phonon coupling, 2D materials, DFT

nije evidentirano