Probing the coupling between a doublon excitation and the charge-density wave in TaS2 by ultrafast optical spectroscopy

Abstract

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.

References in corpus (4)

• Inelastic Light Scattering From Correlated Electrons
• A metallic mosaic phase and the origin of Mott insulating state in 1T-TaS2
• Pristine and intercalated transition metal dichalcogenide superconductors
• Probing the electron-phonon interaction in correlated systems with coherent lattice fluctuation spectroscopy

Cited by in corpus (13)

• Ultrafast doublon dynamics in photo-excited 1T-TaS${}_2$
• Snapshots of a light-induced metastable hidden phase driven by the collapse of charge order
• Ultrafast Modulations And Detection of a Ferro-rotational Charge Density Wave Using Time-resolved Electric Quadrupole Second Harmonic Generation
• Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate
• Influence of spin and orbital fluctuations on Mott-Hubbard exciton dynamics in LaVO${}_3$ Thin Films
• Lattice-Mediated Magnetic Order Melting in TbMnO3
• Doublon-like excitations and their phononic coupling in a Mott charge-density-wave system
• Clocking the Onset of Bilayer Coherence in a High-${\mathrm{T}}_{\mathrm{C}}$ Cuprate
• Spectrally resolving the phase and amplitude of coherent phonons in the charge density wave state of 1$T$-TaSe${}_2$
• Ultrafast dynamics in (TaSe${}_4$)${}_2$I triggered by valence and core-level excitation
• Femtosecond trimer quench cycled at megahertz rates in the unconventional charge-density wave material $1\text{T’}-{\text{TaTe}}_2$
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Ultrafast non-thermal suppression of ferroelectricity by carrier screening in LiNbO3