arXiv subjects

Raimu Akimoto

Publications and source records attributed to Raimu Akimoto.

2 recordsLinked to original sources

arXiv2026

Thermal Einstein-de Haas Effect Induced by Chiral Phonons in Carbon Nanotubes

We investigate the effects of chirality on phonon thermal transport in semiconducting chiral single-walled carbon nanotubes (SWCNTs) using lattice dynamics combined with Boltzmann transport theory. We find that transverse acoustic and optical phonon modes, which are degenerate in nonchiral zigzag and armchair SWCNTs, are split in chiral SWCNTs, giving rise to finite phonon angular momentum associated with circular motion of individual atoms. This angular momentum is most efficiently generated in small-diameter nanotubes with intermediate chiral angles. Consequently, chiral SWCNTs are predicted to undergo thermally induced rigid-body rotation with an experimentally observable angular velocity via the thermal Einstein-de Haas effect.

cond-mat.mes-hall↗

arXiv2025

Frequency Dependence of Phonon-Induced Current Noise in ArmchairCarbon 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.

cond-mat.mes-hall↗