Ground-state properties of nanographite systems with zigzag edges

Article

关键词: QUANTUM RENORMALIZATION-GROUPS;    PEIERLS-HUBBARD MODEL;    CARBON NANOTUBES;    ELECTRONIC-PROPERTIES;    RIBBONS;    POLYACETYLENE;   

DOI  :  10.1103/PhysRevB.68.035432

来源: SCIE

【 摘 要 】

A pi-electron network in nanographite systems with zigzag edges exhibits strongly localized edge states, which are expected to have peculiar properties. We study effects of electron-electron interactions on groundstate properties of zigzag nanographite ribbons and open-ended zigzag nanotubes by means of the weak-coupling renormalization group and the density-matrix renormalization-group method. It is shown that the ground state is a spin-singlet Mott insulator with finite charge and spin gaps. We also find that the edge states are robust against the electronic correlations, resulting in edge-effective spins that can flip almost freely. The schematic picture for the low-energy physics of the systems is discussed.

【 授权许可】

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