Ground state of graphite ribbons with zigzag edges

Details Ground state of graphite ribbons with zigzag edges Ground state of graphite ribbons with zigzag edges

2002-06-13

arxiv.org/abs/cond-mat/0206220v2

Phys. Rev. B 66, 245402 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.245402

We study the interaction effects on the ground state of nanographite ribbons with zigzag edges. Within the mean-field approximation, we found that there are two possible phases: the superconducting (SC) phase and the excitonic insulator (EI). The two phases are separated by a first-order transition point. After taking into account the low-lying fluctuations around the mean-field solutions, the SC phase becomes a spin liquid phase with one gapless charge mode. On the other hand, all excitations in the EI phase, especially the spin excitations, are gapped.

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