Nonlinear Spectroscopy in Semiconductors

✍ Scribed by D. Fröhlich

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 300 KB
• Volume: 215
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/(sici)1521-3951(199909)215:1<7::aid-pssb7>3.0.co;2-3

✦ Synopsis

Due to the additional degrees of freedom in nonlinear spectroscopy as compared to linear spectroscopy, there are much more experiments possible which yield additional information on the electronic parameters of solids. From the consideration of spatial symmetry operators, polarization selection rules are derived which can be connected with wave-vector conservation to do k-space spectroscopy. For magnetic materials the introduction of the time-inversion operator is very useful to be considered together with spatial symmetry operators. One then deals with the magnetic point groups (122 point groups) which, as in the nonmagnetic case (32 point groups), lead to a very systematic study of nonlinear optical properties. It turns out that additional information can be drawn from measuring the phase of nonlinear optical susceptibilities, since for some tensor components there is a phase change connected with applying the time-inversion operator. The study of the additional degree of freedom of phase change together with the detailed polarization dependence can be used to determine the magnetic structure.