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cond-mat.mtrl-sci2026
Microscopic derivation of the microstretch theory for carbon nanotubes
Naoki Nishimura, Mamoru Matsuo, Takeo Kato
Twisted carbon nanotubes support phonons involving not only torsion, naturally associated with microrotation, but also radial breathing, which requires a scalar stretch degree of f…
cond-mat.mtrl-sci2026
Generalized continuum theory of phonon angular momentum in crystals
Mamoru Matsuo, Naoki Nishimura, Ai Yamakage +1
We formulate a generalized continuum theory of phonon angular momentum in crystals by introducing a local SO(3) material frame in addition to the macroscopic displacement field. Th…