# First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr$\_{2}$S$\_{4}$

Source: [First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr$\_{2}$S$\_{4}$](<https://www.sota2.com/research/paper/68fa433e1e209131ce9086d6>)

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Data updated: 2025-10-27T04:19:12.948Z

Authors: M. Naseska, P. Sutar, D. Vengust, M. Ani\\v{c}in, A. Bavec, V. V. Kabanov, D. Mihailovic, T. Mertelj (1,2) \_\_INSTITUTION\_8\_\_ Complex Matter Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia, (2) Center of Excellence on Nanoscience, Nanotechnology Nanocenter, Jamova 39, 1000 Ljubljana, Slovenia)

Published: 2020-05-05T14:14:34.000Z

## Abstract

Ultrafast dynamics across the photoinduced three-dimensional Peierls-like insulator-metal (IM) transition in CuIr$\_{2}$S$\_{4}$ was investigated by means of the all-optical ultrafast multi-pulse time-resolved spectroscopy. The structural coherence of the low-$T$ broken symmetry state is strongly suppressed on a sub-picosecond timescale above a threshold excitation fluence of $F\_{\\mathrm{c}}\\approx3$ mJ/cm$^{2}$ (at 1.55-eV photon energy) resulting in a structurally inhomogeneous transient state which persists for several-tens of picoseconds before reverting to the original low-$T$ state. The electronic order shows a transient gap filling at a significantly lower fluence threshold of $\\sim0.6$~mJ/cm$^{2}$. The data suggest that the photoinduced-transition structural dynamics to the high-$T$ metallic phase is governed by first-order-transition nucleation kinetics that prevents the complete structural transition into the high-$T$ phase even at excitation fluences significantly larger than $F\_{\\mathrm{c}}$. In contrast, the dynamically-decoupled electronic order is suppressed rather independently due to a photoinduced Mott transition.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2005.02207>)

[PDF](<https://arxiv.org/pdf/2005.02207.pdf>)