We investigate the low energy behavior of local density of states in metallic ${\mathrm{C}}_{60}$ polymers theoretically. The multichannel bosonization method is applied to electronic band structures evaluated from first-principles calculation, by which the effects of electronic correlation and nanoscale corrugation in the atomic configuration are fully taken into account. We obtain a closed-form expression for the power-law anomalies in the local density of states, which successfully describes the experimental observation on the ${\mathrm{C}}_{60}$ polymers in a quantitative manner. An important implication from the closed-form solution is the existence of an experimentally unobserved crossover at nearly a hundred milli-electron volts, beyond which the power-law exponent of the ${\mathrm{C}}_{60}$ polymers should change significantly.

• Received 28 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.165431