anything, as long as it's small

Electron-phonon scattering in metallic single-walled carbon nanotubes

Ji-Yong Park, Sami Rosenblatt, Yuval Yaish, Vera Sazonova, Hande Ustunel, Stephan Braig, T. A. Arias, Piet Brouwer, and Paul L. McEuen

Nano Lett. 4, 517 (2004)