Tunable optical topological transitions of plasmon polaritons in WTe₂ van der Waals films.

ABSTRACT: Naturally existing in-plane hyperbolic polaritons and the associated optical topological transitions, which avoid the nano-structuring to achieve hyperbolicity, can outperform their counterparts in artificial metasurfaces. Such plasmon polaritons are rare, but experimentally revealed recently in WTe₂ van der Waals thin films. Different from phonon polaritons, hyperbolic plasmon polaritons originate from the interplay of free carrier Drude response and interband transitions, which promise good intrinsic tunability. However, tunable in-plane hyperbolic plasmon polariton and its optical topological transition of the isofrequency contours to the elliptic topology in a natural material have not been realized. Here we demonstrate the tuning of the optical topological transition throug

SUBMITTER: Xie Y 

PROVIDER: S-EPMC10409815 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature