Nanoscale Depth-Resolved Coherent Femtosecond Motion in Laser-Excited Bismuth

Journal Article · Fri Apr 18 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.155501· OSTI ID:21123883

Johnson, S L; Beaud, P; Krasniqi, F S; Kaiser, M; Grolimund, D; Abela, R; Ingold, G ^[1]; Milne, C J ^[2]; Zijlstra, E S; Garcia, M E ^[3]

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1. Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
2. Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland)
3. Theoretische Physik, Universitaet Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel (Germany)

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{sup 2}/s for the highly excited carriers and an electron-hole interaction time of 260{+-}20 fs.

• OSTI ID: 21123883
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH
CRYSTALS
DIFFUSION
HOLES
INTERACTIONS
LASERS
NANOSTRUCTURES
X-RAY DIFFRACTION