Browsing Research Articles (Physics) by Author "Wagner, M.R."

Browsing Research Articles (Physics) by Author "Wagner, M.R."

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  • Elementary excitations in Si, Ge, and diamond time reversal affected 
    Kunert, Herbert W.; Machatine, Augusto Gonçalo Jose; Malherbe, Johan B.; Barnas, J.; Hoffmann, A.; Wagner, M.R. (Elsevier, 2008)
    The Space Symmetry and the Time Reversal Symmetry of vibrational modes in Si, Ge and diamond are investigated. Using Space Symmetry we have derived the Lattice Mode Representation. Reducing it onto phonon species we obtain ...
  • Infrared absorption, multiphonon processes and time reversal effect on Si and Ge band structure 
    Kunert, Herbert W.; Machatine, Augusto Gonçalo Jose; Malherbe, Johan B.; Barnas, J.; Hoffmann, A.; Wagner, M.R. (Elsevier, 2008)
    We have examined the effect of Time Reversal Symmetry (TRS) on vibrational modes and on the electronic band structure of Si and Ge. Most of the primary non-interacting modes are not affected by TRS. Only phonons originating ...