Femtosecond structural dynamics in VO2 during an ultrafast solid-solid phase transition -: art. no. 237401
Femtosecond structural dynamics in VO2 during an ultrafast solid-solid phase transition -: art. no. 237401
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DOI：
10.1103/physrevlett.87.237401
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发表时间：
2001-12-03
影响因子：
8.6
通讯作者：
Kieffer, JC
中科院分区：
文献类型：
--
作者：
Cavalleri, A;Tóth, C;Kieffer, JC
飞秒X射线和可见光脉冲被用来探测结构和电子动力学过程中的光驱动，在VO 2的固-固相变。对于高带间电子激发（类似于5 × 10（21）cm（-3）），观察到亚皮秒转变为高T，金红石相的材料，同时绝缘体到金属的转变。观察到的快速时间尺度表明，在这种制度下，结构转变可能不会热启动。
Femtosecond x-ray and visible pulses were used to probe structural and electronic dynamics during an optically driven, solid-solid phase transition in VO2. For high interband electronic excitation (similar to5 x 10(21) cm(-3)), a subpicosecond transformation into the high-T, rutile phase of the material is observed, simultaneous with an insulator-to-metal transition. The fast time scale observed suggests that, in this regime, the structural transition may not be thermally initiated.