Multiple Kink Effect in Graphite

Abstract

It is found that the current-voltage relation of graphite has three kink points under the influence of a transverse magnetic field at 77 K and 300 K.
This phenomenon, in spite of its appearance at these high temperature, is identified as Esaki effect, and three kinks are attributed to the interaction between carrier particles and three modes of phonons. In graphite carriers interact with the transverse mode as well as the longitudinal one unlike in an ordinary non-polar material.
A theoretical analysis yields an information on the number of the carriers contributing to each mode.