Frequency Dependence of Phonon-Induced Current Noise in ArmchairCarbon Nanotube

TL;DR

This paper theoretically explores how phonon-induced current noise in armchair carbon nanotubes varies with frequency, revealing multiple resonance peaks and complex interactions beyond simple harmonic models.

Contribution

It uncovers the frequency-dependent resonance phenomena and identifies the roles of harmonic and anharmonic phonon interactions in current noise.

Findings

Multiple high-frequency resonance peaks observed.

Some peaks explained by energy and momentum conservation.

Evidence of nontrivial electron-phonon interactions.

Abstract

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.