Ground state of graphite ribbons with zigzag edges

Abstract

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.

6 pages, 3 figures

References in corpus (2)

• Ghost excitonic insulator transition in layered graphite
• Magnetic field-induced insulating behavior in highly oriented pyrolitic graphite

Cited by in corpus (3)

• Tuning the electronic structures of armchair graphene nanoribbons through chemical edge modification: A theoretical study
• Zero-energy edge states and chiral symmetry breaking at edges of graphite sheets
• Correlation effects of carbon nanotubes at boundaries: Spin polarization induced by zero-energy boundary states