Ultrafast Excited-State Dynamics of V_{3}O_{5} as a Signature of a Photoinduced Insulator-Metal Phase Transition.
Ultrafast Excited-State Dynamics of V_{3}O_{5} as a Signature of a Photoinduced Insulator-Metal Phase Transition.
复制标题
V_{3}O_{5} 的超快激发态动力学作为光致绝缘体-金属相变的特征。
DOI：
10.1103/physrevlett.119.057602
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发表时间：
2017
影响因子：
8.6
通讯作者：
S. Lysenko
中科院分区：
文献类型：
--
作者：
Nardeep Kumar;A. Rúa;Junqiang Lu;F. Fernández;S. Lysenko
应用超快弹性光散射技术揭示了V_{3}O_{5}与光致绝缘体-金属相变相关的强非线性。时域弛豫动力学的观察表明了结构转变的几个阶段。本文从极极性Wigner晶体的光致熔化、V-O八面体的聚并以及V_{3}O_{5}低t相和高t相声子的光产生等方面讨论了V_{3}O_{5}中的非平衡过程。分子动力学计算支持实验观察到的V_{3}O_{5}弛豫动力学阶段。
The ultrafast elastic light scattering technique is applied to reveal the strong nonlinearity of V_{3}O_{5} associated with a photoinduced insulator-metal phase transition. Observation of time-domain relaxation dynamics suggests several stages of structural transition. We discuss the nonequilibrium processes in V_{3}O_{5} in terms of photoinduced melting of a polaronic Wigner crystal, coalescence of V-O octahedra, and photogeneration of acoustical phonons in the low-T and high-T phases of V_{3}O_{5}. A molecular dynamics computation supports experimentally observed stages of V_{3}O_{5} relaxation dynamics.