Phonon trigonal warping effect in graphite and carbon nanotubes

2019-12-21 21:35:12

carbon Raman graphite nanotubes phonon

责任者: Samsonidze, G.G.;Saito, R.;Jorio, A.;Souza Filho, A.G.;Gruneis, A.;Pimenta, M.A.;Dresselhaus, G.;Dresselhaus, M.S. 单位: Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2003/01/17,90(2):027403-1 摘要: The one-dimensional structure of carbon nanotubes leads to quantum confinement of the wave vectors for the electronic states, thus making the double resonance Raman process selective, not only of the magnitude, but also of the direction of the phonon wave vectors. This additional selectivity allows us to reconstruct the phonon dispersion relations of 2D graphite, by probing individual single wall carbon nanotubes of different chiralities by resonance Raman spectroscopy, and using different laser excitation energies. In particular, we are able to measure the anisotropy, or the trigonal warping effect, in the phonon dispersion relations around the hexagonal corner of the Brillouin zone of graphite 关键词: Brillouin zones;carbon nanotubes;chirality;graphite;phonon dispersion relations;phonon spectra;Raman spectra;phonon trigonal warping effect;graphite;carbon nanotubes;one-dimensional structure;quantum confinement;wave vectors;electronic states;double resonance Raman process;phonon wave vectors;phonon dispersion relations;2D graphite;single wall carbon nanotubes;chiralities;resonance Raman spectroscopy;laser excitation energies;anisotropy;hexagonal corner;Brillouin zone;C