Ferromagnetism without flat bands in thin armchair nanoribbons
arXiv:1005.2126 · doi:10.1140/epjb/e2010-00160-0
Abstract
Describing by a Hubbard type of model a thin armchair graphene ribbon in the armchair hexagon chain limit, one shows in exact terms, that even if the system does not have flat bands at all, at low concentration a mesoscopic sample can have ferromagnetic ground state, being metallic in the same time. The mechanism is connected to a common effect of correlations and confinement.
37 pages, 12 figures, in press at Eur. Phys. Jour. B
References in corpus (13)
- The electronic properties of graphene
- Valley filter and valley valve in graphene
- Spin qubits in graphene quantum dots
- Edge state on hydrogen-terminated graphite edges investigated by scanning tunneling microscopy
- Shot Noise in Graphene
- Electronic Correlations in Oligo-acene and -thiophene Organic Molecular Crystals
- Low-temperature properties of the Hubbard model on highly frustrated one-dimensional lattices
- Exact many-electron ground states on the diamond Hubbard chain
- Magnetism in strained graphene dots
- Exact Insulating and Conducting Ground States of a Periodic Anderson Model in Three Dimensions
- Ferromagnetism in armchair graphene nanoribbon
- Delocalization effect of the Hubbard repulsion in exact terms and two dimensions
- Correlation and confinement induced itinerant ferromagnetism in chain structures