Phys. Rev. Lett. 100, 155501 (2008) [4 pages]Nanoscale Depth-Resolved Coherent Femtosecond Motion in Laser-Excited BismuthReceived 4 October 2007; published 14 April 2008 We employ grazing-incidence femtosecond x-ray diffraction to characterize the coherent, femtosecond laser-induced lattice motion of a bismuth crystal as a function of depth from the surface with a temporal resolution of 193±8 fs. The data show direct consequences on the lattice motion from carrier diffusion and electron-hole interaction, allowing us to estimate an effective diffusion rate of D=2.3±0.3 cm2/s for the highly excited carriers and an electron-hole interaction time of 260±20 fs. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.155501
DOI:
10.1103/PhysRevLett.100.155501
PACS:
61.80.Ba, 61.05.C−, 63.20.K−, 78.47.J-
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