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Femtosecond X-Rays and Structural Dynamics in Condensed Matter

  • Andrea Cavalleri
  • Robert W. Schoenlein
Chapter
Part of the Topics in Applied Physics book series (TAP, volume 92)

Abstract

In this chapter, some of the recent advancements in the nascent field of femtosecond X-ray scattering are reviewed. First, we discuss selected diffraction experiments performed with femtosecond pulses of \(\mathrm{K}_{\alpha}\) fluorescence from a TW-laser-generated Cu plasmas. Coherent acoustic phonons in both bulk and layered semiconductor heterostructures have been investigated. These experiments provide direct information on lattice motion well beyond the depths that are typically probed by visible light. Vibrational transport across buried interfaces, as well as dephasing of lattice waves have been directly measured and modeled. The same apparatus has been used to probe subpicosecond formation of a product structural phase during a photoinduced phase transition in the strongly correlated material VO\(_{2}\). Secondly, we review parallel progress in the generation of tunable femtosecond pulses from third-generation storage rings, achieved by interaction of femtosecond optical pulses and picosecond-long electron bunches within an insertion device (wiggler). The primary advantage of these new schemes, producing trains of pulses that are comparable in photon numbers to laser-produced plasma sources, is the tunability from the visible to the hard X-ray regime. We describe one possible application of these tunable femtosecond pulses to X-ray spectroscopies of transition metal oxides, where near-edge absorption (NEXAFS) and extended X-ray absorption (EXAFS) can probe electronic, magnetic, and short-range atomic structure during a phase transition.

Keywords

68 

Keywords

68 

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Authors and Affiliations

  • Andrea Cavalleri
    • 1
  • Robert W. Schoenlein
    • 1
  1. 1.Materials Sciences Division Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA

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