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arXiv · 2509.15358

Long-lived dynamics of the charge density wave in TiSe2 observed by time-resolved neutron diffraction

K. Dharmasiri·S. S. Philip·D. Louca·S. A. Chen·M. D. Frontzek·Z. J. Morgan·C. Hua
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Abstract

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-TiSe$_{2}$ 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.

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K. Dharmasiri, S. S. Philip, D. Louca, S. A. Chen, M. D. Frontzek, Z. J. Morgan, C. Hua. 2025-09-18. Long-lived dynamics of the charge density wave in TiSe2 observed by time-resolved neutron diffraction. https://arxiv.org/abs/2509.15358

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