In 1T-TiSe2, increasing pump fluence hardens the CDW amplitude phonon mode as a signature of ultrafast bare lattice potential restoration via carrier screening, while crossing a critical fluence triggers a photoinduced metastable metallic state.
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Ultrafast Stiffening of the Lattice Potential and Metastable State Formation in 1$T$-TiSe$_2$
In 1T-TiSe2, increasing pump fluence hardens the CDW amplitude phonon mode as a signature of ultrafast bare lattice potential restoration via carrier screening, while crossing a critical fluence triggers a photoinduced metastable metallic state.