2025/09/18 by Kusal Sachithra Dharmasiri, Sharon S. Philip, Dharmasiri, K. +11
Materials Science · Engineering · #2D Materials and Applications #Chalcogenide Semiconductor Thin Films #Organic and Molecular Conductors Research
paper · pdf · doi:10.48550/arxiv.2509.15358
We use time-resolved elastic neutron scattering combined with laser heating to probe the temporal evolution of periodic lattice distortions (PLD) due to the formation of a charge density wave (CDW) state in 1T-TiSe2 under extreme non-equilibrium conditions. Below the transition temperature, the PLD is manifested as a 2x2x2 superlattice superimposed on the average Bragg structure. Following rapid energy deposition with the laser, kinetic bottlenecks lead to a separation of timescales between the superlattice and the underlying lattice response. The superlattice melts on a characteristic timescale of approximately 3 s, whereas the average lattice responds more slowly to heating. Upon removal of the heat source, the Bragg lattice recovers within approximately 11 s, while the superlattice re-establishes on nearly twice that timescale. These results reveal an asymmetric evolution of short- and long-range order under extreme non-equilibrium conditions, in which local PLD correlations are destroyed prior to, and recover more slowly than, the average lattice structure.