The weak interlayer bonding in Bernai graphite induces low-density free carriers and thus low-frequency plasmons (< 0.2 eV). Such plasmons reveal themselves as pronounced peaks in the loss spectra and abrupt edge structures in the reflectance spectra. The low-frequency plasmons are very sensitive to changes in temperature and momentum, mainly owing to the unique low-energy band structure. They can exist at larger momenta as temperature increases. The plasmon frequency clearly increases with temperature and momentum. The plasmon peak is broadened by temperature; furthermore, it decreases with momentum. The calculated results are consistent with the experimental measurements.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)