Electric capacitance as nanocondensers in zigzag nanographite ribbons

TL;DR

This study investigates the electric capacitance of zigzag nanographite ribbons, revealing how magnetic and charge polarized phases influence their nanoelectronic properties and potential as nanocondensers.

Contribution

It introduces a model for nanocondensers in zigzag nanographite ribbons and analyzes their capacitance behavior based on edge states and ribbon width.

Findings

Capacitance varies significantly between magnetic and charge polarized phases.

In wider ribbons, capacitance remains large and inversely proportional to width.

Charge gap influences capacitance behavior in semiconducting nanotubes.

Abstract

Electronic states in nanographite ribbons with zigzag edges are studied using the extended Hubbard model with nearest neighbor Coulomb interactions. The nearest Coulomb interactions stabilize electronic states with the opposite electric charges separated and localized along both edges. Such states are analogous as nanocondensers. Therefore, electric capacitance, defined using a relation of polarizability, is calculated to examine nano functionalities. We find that the behavior of the capacitance is widely different depending on whether the system is in the magnetic or charge polarized phases. In the magnetic phase, the capacitance is dominated by the presence of the edge states while the ribbon width is small. As the ribbon becomes wider, the capacitance remains with large magnitudes as the system develops into metallic zigzag nanotubes. It is proportional to the inverse of the width, when the system corresponds to the semiconducting nanotubes and the system is in the charge polarized phase also. The latter behavior could be understood by the presence of an energy gap for charge excitations.