Browsing Physics by Subject "Phonons"

Browsing Physics by Subject "Phonons"

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  • Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy 
    Akande, Amos Adeleke; Machatine, Augusto Gonçalo Jose; Masina, Bathusile; Chimowa, George; Matsoso, Boitumelo; Roro, Kittessa; Duvenhage, Mart-Mari; Swart, Hendrik; Bandyopadhyay, Jayita; Ray, Suprakas Sinha; Mwakikunga, Bonex Wakufwa (IOP Publishing, 2018)
    A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer ...
  • 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 ...