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Phys Rev Lett. 2005 Aug 5;95(6):067405. Epub 2005 Aug 5.

Band-selective measurements of electron dynamics in VO2 using femtosecond near-edge x-ray absorption.

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Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.


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.

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