Frequency Dependence of Phonon-Induced Current Noise in Armchair Carbon Nanotube

We theoretically investigate the frequency dependence of phonon-induced current noise in armchair carbon nanotubes at room temperature. Our results reveal the emergence of multiple resonance peaks in the high-frequency regime, which cannot be accounted for by the Lorentzian lineshape expected from a Markovian process. The electron-phonon scattering processes responsible for most of these peaks are identified based on energy and momentum conservation laws and conventional selection rules. However, certain peaks cannot be fully explained within the framework of harmonic phonon scattering, suggesting the involvement of nontrivial interactions between electrons and anharmonic phonons.