Revealing Light-Induced Charge Density Wave Melting and CarrierRedistribution in 1T-TiSe₂

Capturing ultrafast dynamics over a large momentum space is critical for revealing the relationship betweenthe electronic and structural modulations in quantum materials. Here, by performing time- and angle-resolvedphotoemission spectroscopy measurements at the Synergetic Extreme Condition User Facility (SECUF) equippedwith an extreme ultraviolet light source, we reveal the ultrafast dynamics of a charge-density wave (CDW)material, 1T-TiSe₂, upon photoexcitation. Pump-induced CDW melting is revealed from two aspects: gap closingof the CDW at the Brillouin zone (BZ) center and weakening of the CDW folded band at the BZ boundary. Bycomparing the transient electronic structure and spectral weight over a large momentum space, we further revealthe carrier redistribution involving the excitation of electrons from the Γ point to the M point. This studyprovides a comprehensive picture of the physics and ultrafast dynamics of a CDW material across the entire BZ.