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Naturally existing in-plane hyperbolic polaritons and the associated opticaltopological transitions, which avoid the nano-structuring to achievehyperbolicity, can outperform their counterparts in artificial metasurfaces.Such plasmon polaritons are rare, but experimentally revealed recently in WTe2van der Waals thin films. Different from phonon polaritons, hyperbolic plasmonpolaritons originate from the interplay of free carrier Drude response andinterband transitions, which promise good intrinsic tunability. However,tunable in-plane hyperbolic plasmon polariton and its optical topologicaltransition of the isofrequency contours to the elliptic topology in a naturalmaterial have not been realized. Here we demonstrate the tuning of the opticaltopological transition through Mo-doping and temperature. The opticaltopological transition energy is tuned over a wide range, with frequenciesranging from 429 cm-1 (23.3 microns) for pure WTe2 to 270 cm-1 (37.0 microns)at the 50% Mo-doping level at 10 K. Moreover, the temperature-induced blueshiftof the optical topological transition energy is also revealed, enabling activeand reversible tuning. Surprisingly, the localized surface plasmon resonance inskew ribbons shows unusual polarization dependence, accurately manifesting itstopology, which renders a reliable means to track the topology with far-fieldtechniques. Our results open an avenue for reconfigurable photonic devicescapable of plasmon polariton steering, such as canaling, focusing and routing,and pave a way for low-symmetry plasmonic nanophotonics based on anisotropicnatural materials.

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