The compound V4O7 is one of the Magnéli phase (VnO2n − 1, n = 3, 4, …, 9) correlated vanadium oxides with distinct intriguing electronic and structural properties. The possibility to manipulate the phase state of V4O7 on an ultrafast time scale by light makes this material promising for potential applications in photonics, optoelectronics, quantum, and neuromorphic circuit design. In this work, the ultrafast spectroscopy of V4O7 reveals the second‐order nature of the photoinduced insulator‐to‐metal transition, emphasizing electronic and lattice contributions. The findings reveal the influence of the laser excitation level and temperature on these dynamics, providing a comprehensive understanding of V4O7 structural changes and response to external stimuli. The phenomenological model based on the Landau–Ginzburg formalism provides a robust framework for explaining the photoinduced transition dynamics, showing a detailed picture of the light interaction with the electronic and lattice subsystems. This integrated approach significantly enhances the understanding of V4O7 complex behavior upon photoexcitation, opening new possibilities for developing new optoelectronic devices and noninvasive optical control of the phase transition pathways in vanadates.

中文翻译：

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V4O7 相关态的光诱导熔化


化合物 V4O7 是 Magnéli 相 （VnO2n − 1， n = 3， 4， ...， 9） 相关的氧化钒之一，具有独特有趣的电子和结构特性。通过光在超快时间尺度上操纵 V4O7 相态的可能性使这种材料在光子学、光电子学、量子和神经形态电路设计中具有潜在应用前景。在这项工作中，V4O7 的超快光谱揭示了光诱导绝缘体到金属转变的二阶性质，强调了电子和晶格的贡献。研究结果揭示了激光激发水平和温度对这些动力学的影响，从而全面了解 V4O7 结构变化和对外部刺激的响应。基于 Landau-Ginzburg 形式主义的现象学模型为解释光诱导过渡动力学提供了一个强大的框架，显示了光与电子和晶格子系统相互作用的详细图片。这种集成方法显着增强了对 V4O7 在光激发下配合行为的理解，为开发新的光电器件和无创光学控制钒酸盐中相变途径开辟了新的可能性。