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1T-TiSe2 is one of the most studied charge density wave (CDW) systems, notonly because of its peculiar properties related to the CDW transition, but alsodue to its status as a promising candidate of exciton insulator signaled by theproposed plasmon softening at the CDW wave vector. Using high-resolutionelectron energy loss spectroscopy, we report a systematic study of thetemperature-dependent plasmon behaviors of 1T-TiSe2. We unambiguously resolvethe plasmon from phonon modes, revealing the existence of Landau damping to theplasmon at finite momentums, which does not support the plasmon softeningpicture for exciton condensation. Moreover, we discover that the plasmonlifetime at zero momentum responds dramatically to the bandgap evolutionassociated with the CDW transition. The interband transitions near the Fermienergy in the normal phase is demonstrated serving as a strong damping channelof plasmons, while such a channel in the CDW phase is suppressed due to the CDWgap opening, which results in the dramatic tunability of the plasmon insemimetals or small-gap semiconductors.

Dramatic Plasmon Response to the Charge-Density-Wave Gap Development in $1\textit{T}-{\mathrm{TiSe}}_{2}$