Band-selective measurements of electron dynamics in VO2 using femtosecond near-edge x-ray absorption -: art. no. 067405
Band-selective measurements of electron dynamics in VO2 using femtosecond near-edge x-ray absorption -: art. no. 067405
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DOI：
10.1103/physrevlett.95.067405
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发表时间：
2005-08-05
影响因子：
8.6
通讯作者：
Schoenlein, RW
中科院分区：
文献类型：
--
作者：
Cavalleri, A;Rini, M;Schoenlein, RW
我们报告的第一个演示飞秒x射线吸收光谱，使独特的可能通过使用广泛的可调谐弯曲磁铁辐射从“激光切片”电子束在同步加速器储存环。我们测量飞秒电子重排过程中发生的光致绝缘体-金属相变VO 2。从V2 p和O 1 s核心水平（近500 eV）的对称性和特定元素的X射线吸收分别测量费米能级附近的不同杂化V3 d-O2 p电子带的填充动力学。
We report on the first demonstration of femtosecond x-ray absorption spectroscopy, made uniquely possible by the use of broadly tunable bending-magnet radiation from "laser-sliced" electron bunches within a synchrotron storage ring. We measure the femtosecond electronic rearrangements that occur during the photoinduced insulator-metal phase transition in VO2. Symmetry- and element-specific x-ray absorption from V2p and O1s core levels (near 500 eV) separately measures the filling dynamics of differently hybridized V3d-O2p electronic bands near the Fermi level.