---
res:
  bibo_abstract:
  - The ultrafast dynamics of photoexcitations at silicon surfaces is investigated
    using a surface-sensitive purely optical technique. In the experiments, the diffracted
    second harmonic generated by sequences of ultrashort laser pulses is detected
    as a function of the time delay between the pulses. It is demonstrated that this
    five-wave-mixing technique can be used to measure the temporal evolution of the
    optical polarization and the photoexcited populations at the surface. The experimental
    results can be reproduced by numerical solutions of optical Bloch equations. The
    theoretical analysis allows one to investigate which dephasing times and relaxation
    processes are compatible with experiment. Furthermore, it is outlined how one
    can describe optical nonlinearities at surfaces using a microscopic theory within
    the framework of semiconductor Bloch equations.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Torsten
      foaf_name: Meier, Torsten
      foaf_surname: Meier
      foaf_workInfoHomepage: http://www.librecat.org/personId=344
    orcid: 0000-0001-8864-2072
  - foaf_Person:
      foaf_givenName: Matthias
      foaf_name: Reichelt, Matthias
      foaf_surname: Reichelt
      foaf_workInfoHomepage: http://www.librecat.org/personId=138
  - foaf_Person:
      foaf_givenName: S W
      foaf_name: Koch, S W
      foaf_surname: Koch
  - foaf_Person:
      foaf_givenName: U
      foaf_name: Höfer, U
      foaf_surname: Höfer
  bibo_doi: 10.1088/0953-8984/17/8/003
  bibo_issue: '8'
  bibo_volume: 17
  dct_date: 2005^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0953-8984
  - http://id.crossref.org/issn/1361-648X
  dct_language: eng
  dct_title: Femtosecond time-resolved five-wave mixing at silicon surfaces@
...