Photoexcitation Induced Quantum Dynamics of Charge Density Wave and Emergence of a Collective Mode in 1T-TaS${}_2$

Abstract

Photoexcitation is a powerful means in distinguishing different interactions and manipulating the states of matter, especially in complex quantum systems. As a well-known charge density wave (CDW) material, 1T-TaS2 has been widely studied experimentally thanks to its intriguing photoexcited responses. However, the microscopic atomic dynamics and underlying mechanism are still under debate. Here, we demonstrate photoexcitation induced ultrafast dynamics in 1T-TaS2 using time-dependent density functional theory molecular dynamics. We discover a novel collective mode induced by photodoping, which is significantly different from thermally-induced phonon mode in TaS2. In addition, our finding validates nonthermal melting of CDW induced at low light intensities, supporting that conventional hot electron model is inadequate to explain photoinduced dynamics. Our results provide a deep insight on coherent electron and lattice quantum dynamics during the formation and excitation of CDW in 1T-TaS2.

arXiv comment5 figures

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Cited by in corpus (18)

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• Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2
• Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2
• Identification of the Mott insulating CDW state in 1T-TaS${}_2$
• Uniting the order and disorder dynamics in photoexcited VO2
• Simulating terahertz field-induced ferroelectricity in quantum paraelectric SrTiO${}_3$
• Snapshots of a light-induced metastable hidden phase driven by the collapse of charge order
• The critical role of hot carrier cooling in optically excited structural transitions
• Origin of Immediate Damping of Coherent Oscillations in Photoinduced Charge Density Wave Transition
• Doublon-like excitations and their phononic coupling in a Mott charge-density-wave system
• How to choose efficiently the size of the Bethe-Salpeter Equation Hamiltonian for accurate exciton calculations on supercells
• Ultrafast excitation and topological soliton formation in incommensurate charge density wave states
• Frustrated phonon with charge density wave in vanadium Kagome metal
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Fate of transient order parameter domain walls in ultrafast experiments
• Ultrafast Electronic Structure Engineering in 1$T$-TaS${}_2$: Role of Doping and Amplitude Mode Dynamics
• Giant Optomechanical Coupling in the Charge Density Wave State of Tantalum Disulfide
• Toward nonthermal control of excited quantum materials: framework and investigations by ultrafast electron scattering and imaging