Photoinduced Dynamics of Commensurate Charge Density Wave in 1T-TaS${}_2$ Based on Three-Orbital Hubbard Model

Abstract

We study the coupled charge-lattice dynamics in the commensurate charge density wave (CDW) phase of the layered compound 1T-TaS${}_2$ driven by an ultrashort laser pulse. For describing its electronic structure, we employ a tight-binding model of previous studies including the effects of lattice distortion associated with the CDW order. We further add on-site Coulomb interactions and reproduce an energy gap at the Fermi level within a mean-field analysis. On the basis of coupled equations of motion for electrons and the lattice distortion, we numerically study their dynamics driven by an ultrashort laser pulse. We find that the CDW order decreases and even disappears during the laser irradiation while the lattice distortion is almost frozen. We also find that the lattice motion sets in on a longer time scale and causes a further decrease in the CDW order even after the laser irradiation.

13 pages, 7 figures; submitted to Special Issue "Photoinduced Cooperative Phenomena" in Appl. Sci

References in corpus (7)

• Is 1T-TaS${}_2$ a 40 year old quantum spin liquid?
• A new high-temperature quantum spin liquid with polaron spins
• Theory of photoinduced ultrafast switching to a spin-orbital ordered `hidden' phase
• Photoinduced melting of charge order in a quarter-filled electron system coupled with different types of phonons
• Direct Observation of Mono-, Bi-, and Tri-layer Charge Density Waves in 1T-TaS_2 by Transmission Electron Microscopy without a Substrate
• Real-time observation of the coherent transition to a metastable emergent state in 1T-TaS${}_2$
• Coupling between Charge, Lattice, Orbital, and Spin in a Charge Density Wave of 1$T$-TaS${}_2$

Cited by in corpus (4)

• Photoexcitation Induced Quantum Dynamics of Charge Density Wave and Emergence of a Collective Mode in 1T-TaS${}_2$
• Snapshots of a light-induced metastable hidden phase driven by the collapse of charge order
• Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
• Ultrafast Electronic Structure Engineering in 1$T$-TaS${}_2$: Role of Doping and Amplitude Mode Dynamics