Journal article
Nanoscale depth-resolved coherent femtosecond motion in laser-excited bismuth
Publication Details
Authors: | Johnson, S.; Beaud, P.; Milne, C.; Krasniqi, F.; Zijlstra, E.; Garcia, M.; Kaiser, M.; Grolimund, D.; Abela, R.; Ingold, G. |
Publication year: | 2008 |
Journal: | Physical Review Letters |
Pages range : | 155501 |
Journal acronym: | PRL |
Volume number: | 100 |
ISSN: | 0031-9007 |
eISSN: | 1079-7114 |
Abstract
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 cm(2)/s for the highly excited carriers and an electron-hole interaction time of 260 +/- 20 fs.
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 cm(2)/s for the highly excited carriers and an electron-hole interaction time of 260 +/- 20 fs.
