Cavalleri A, Tóth C, Siders C W, Squier J A, Ráksi F, Forget P, Kieffer J C
University of California San Diego, La Jolla, California 92093-0339, USA.
Phys Rev Lett. 2001 Dec 3;87(23):237401. doi: 10.1103/PhysRevLett.87.237401. Epub 2001 Nov 16.
Femtosecond x-ray and visible pulses were used to probe structural and electronic dynamics during an optically driven, solid-solid phase transition in VO(2). For high interband electronic excitation (approximately 5 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.
飞秒X射线和可见光脉冲被用于探测在光驱动下VO₂中发生的固-固相变过程中的结构和电子动力学。对于高带间电子激发（约5×10²¹ cm⁻³），观察到材料在亚皮秒时间内转变为高温金红石相，同时发生绝缘体到金属的转变。观察到的快速时间尺度表明，在这种情况下，结构转变可能不是由热引发的。
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