# 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/68fa3f551e209131ce8ec8dd>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T02:20:30.196Z

Authors: M. Naseska, P. Sutar, Y. Vaskivskyi, I. Vaskivskyi, D. Vengust, D. Svetin, V. V. Kabanov, D. Mihailovic, T. Mertelj (1,2) \_\_INSTITUTION\_9\_\_ Complex Matter Department, Jozef Stefan Institute, Ljubljana, Slovenia, (2) Center of Excellence on Nanoscience, Nanotechnology Nanocenter, Ljubljana, Slovenia)

Published: 2021-04-08T11:39:14.000Z

## Abstract

The spinel-structure CuIr$\_{2}$S$\_{4}$ compound displays a rather unusual orbitally-driven three-dimensional Peierls-like insulator-metal transition. The low-T symmetry-broken insulating state is especially interesting due to the existence of a metastable irradiation-induced disordered weakly conducting state. Here we study intense femtosecond optical pulse irradiation effects by means of the all-optical ultrafast multi-pulse time-resolved spectroscopy. We show that the structural coherence of the low-T broken symmetry state is strongly suppressed on a sub-picosecond timescale above a threshold excitation fluence resulting in a structurally inhomogeneous transient state which persists for several-tens of picoseconds before reverting to the low-T disordered weakly conducting state. The electronic order shows a transient gap filling at a significantly lower fluence threshold. The data suggest that the photoinduced-transition dynamics to the high-T metallic phase is governed by first-order-transition nucleation kinetics that prevents the complete ultrafast structural transition even when the absorbed energy significantly exceeds the equilibrium enthalpy difference to the high-T metallic phase. In contrast, the dynamically-decoupled electronic order is transiently suppressed on a sub-picosecond timescale rather independently due to a photoinduced Mott transition.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2104.03698>)

[PDF](<https://arxiv.org/pdf/2104.03698.pdf>)