Dynamical Aspects of the Photoinduced Phase Transition in Spin-Crossover Complexes

Ogawa, Yoshihiro; Koshihara, Shin‐ya; Koshino, Kazuki; Ogawa, T.; Urano, Chiharu; Takagi, H.

doi:10.1103/physrevlett.84.3181

Cited by 222 publications

(171 citation statements)

References 12 publications

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“…In both cases, a photostationary state is generated at long times (see below). Another intriguing point, detectable in many photoexcitation kinetic data, is the frequent observation of an incubation stage [27,28], an effect reminiscent of some solid-state first-order transitions (cooperative photoprocess? [29]).…”

Section: Optical Switchingmentioning

confidence: 99%

Examples of molecular switching in inorganic solids, due to temperature, light, pressure, and magnetic field

Varret

Bleuzen

Boukheddaden

et al. 2002

Pure and Applied Chemistry

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Section: Optical Switchingmentioning

confidence: 99%

Examples of molecular switching in inorganic solids, due to temperature, light, pressure, and magnetic field

Varret

Bleuzen

Boukheddaden

et al. 2002

Pure and Applied Chemistry

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“…The emergence of incubation time has been observed in a variety of photoinduced phase transition phenomena, e.g. in spincrossover complexes, 10) and discussed theoretically, 11,12) suggesting the generic character of photoinduced phenomena associated with the first-order phase transition.…”

mentioning

confidence: 97%

Rate Equation Analysis of the Dynamics of First-order Exciton Mott Transition

Sekiguchi

Shimano

2017

J. Phys. Soc. Jpn.

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We performed a rate equation analysis on the dynamics of exciton Mott transition (EMT) with assuming a detailed balance between excitons and unbound electron-hole (e-h) pairs. Based on the Saha equation with taking into account the empirical expression for the band-gap renormalization effect caused by the unbound e-h pairs, we show that the ionization ratio of excitons exhibits a bistability as a function of total e-h pair density at low temperatures. We demonstrate that an incubation time emerges in the dynamics of EMT from oversaturated exciton gas phase on the verge of the bistable region. The incubation time shows a slowing down behavior when the pair density approaches toward the saddle-node bifurcation of the hysteresis curve of the exciton ionization ratio.Photocontrol of condensed matter systems has gained continuing interests over decades, [1][2][3] e.g. in semiconductors, 4,5) Mott insulators, 3,6-9) spin crossover complexes, [10][11][12] and superconductors. 13,14) Among diverse material systems, photoexcited electron-hole (e-h) systems in semiconductors offer a unique arena to study the rich variety of phases emergent in many particle systems, and their non-equilibrium dynamics. 4,15) One of the intriguing aspects of e-h systems is that the strength of inter-particle Coulomb interaction can be effectively controlled by changing the density of photoexcited carriers through the screening effect, by simply changing the excitation light intensity. The change of the Coulomb interaction causes a phase transition, or crossover, from the insulating exciton gas phase in the low density regime to the metallic e-h plasma in the high density regime, referred to as exciton Mott transition (EMT). There is a long-standing argument whether EMT is a crossover or a first-order phase transition accompanied by a bistability at sufficiently low temperatures. [16][17][18][19][20][21][22] In general, bistability appears in diverse systems such as electronic circuits, optoelectronic systems, magnetic systems, molecular and biological systems, etc. Figure

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“…In addition, these data were obtained on powder samples. Recent optical microscopy experiments, 9,10 anticipated by a first effort fifteen years ago towards the visualization of a spin crossover compound structure during the transition, 11 have provided excellent proofs of cluster spreading in spin crossover single crystals of different shapes, such as rectangular, hexagonal, monoclinic or orthorhombic etc. These experiments have revealed the fact that clusters mostly develop from corners or around defects and eventually spread throughout the whole sample via an avalanche-like process.…”

Section: Introductionmentioning

confidence: 99%

Shape effects on the cluster spreading process of spin-crossover compounds analyzed within an elastic model with Eden and Kawasaki dynamics

et al. 2015

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In this paper we study the growth properties of domains of low spin molecules in a high spin background in open boundary elliptically shaped spin crossover systems within the framework of the mechanoelastic model. The molecules are situated on a triangular lattice and are linked by springs, through which they interact. Elliptical shapes are chosen in order to allow an in-depth analysis of cluster shapes as a function of the local curvature at their starting point and the length of the interface between the two phases. Contrary to the case of rectangular and hexagonal shapes, where the clusters always start from corners, we find that for ellipses clusters nucleate from vertices, co-vertices or any other site. We apply and compare two kinds of dynamics, Edenlike and Kawasaki, in order to determine the stable shape of the clusters and the most probable starting points. We show that the wetting angle for small clusters is somewhat higher than π/2 and approaches this value only for large clusters. The stability of clusters is analyzed by comparing the Gibbs free energy to the elastic energy in the system and is discussed as a function of the cluster size, curvature of the starting place and temperature.

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Dynamical Aspects of the Photoinduced Phase Transition in Spin-Crossover Complexes

Cited by 222 publications

References 12 publications

Examples of molecular switching in inorganic solids, due to temperature, light, pressure, and magnetic field

Examples of molecular switching in inorganic solids, due to temperature, light, pressure, and magnetic field

Rate Equation Analysis of the Dynamics of First-order Exciton Mott Transition

Shape effects on the cluster spreading process of spin-crossover compounds analyzed within an elastic model with Eden and Kawasaki dynamics

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