Raman Spectroscopy in Graphene Related S
✍
Jorio, Ado; Saito, Riichiro; Dresselhaus, Gene; Dresselhaus, Mildred S.
📂
Article
📅
2011
🏛
Wiley-VCH Verlag GmbH & Co. KGaA
🌐
German
⚖ 365 KB
👁 2 views
In an ionic crystal, the LO phonon has a higher frequency than the TO phonon mode since the Coulomb interaction acts only on the LO mode. 2) Since there is another E 2g symmetry mode in the acoustic phonon branch, we sometimes denote the degenerate iTO and LO optical mode as the E 2g (2) or E 2g2 m