1108.0088 (Hao Wang et al.)

Models of Strong Interaction in Flat-Band Graphene Nanoribbons: Magnetic
Quantum Crystals    [PDF]

Hao Wang, V. W. Scarola

Graphene based nanostructures exhibit flat electronic energy bands in their single-particle spectrum. We consider interacting electrons in flat bands of zig-zag nanoribbons. We present a protocol for flat-band projection that yields interaction-only tight-binding models. We argue that, at low densities, flat bands can delocalize single-particle basis states to support ferromagnetic quantum crystal ground states.

View original: http://arxiv.org/abs/1108.0088