  Recently, the switching between the different charge-ordered phases of
1T-TaS2 has been probed by ultrafast techniques, revealing unexpected phenomena
such as "hidden" metastable states and peculiar photoexcited charge patterns.
Here, we apply broadband pump-probe spectroscopy with varying excitation energy
to study the ultrafast optical properties of 1T-TaS2 in the visible regime. By
scanning the excitation energy in the near-IR region we unravel the coupling
between different charge excitations and the low-lying charge-density wave
state. We find that the amplitude mode of the charge-density wave exhibits
strong coupling to a long-lived doublon state that is photoinduced in the
center of the star-shaped charge-ordered Ta clusters by the near-IR optical
excitation.
