Ferromagnetism in armchair graphene nanoribbon

Abstract

Due to the weak spin-orbit interaction and the peculiar relativistic dispersion in graphene, there are exciting proposals to build spin qubits in graphene nanoribbons with armchair boundaries. However, the mutual interactions between electrons are neglected in most studies so far and thus motivate us to investigate the role of electronic correlations in armchair graphene nanoribbon by both analytical and numerical methods. Here we show that the inclusion of mutual repulsions leads to drastic changes and the ground state turns ferromagnetic in a range of carrier concentrations. Our findings highlight the crucial importance of the electron-electron interaction and its subtle interplay with boundary topology in graphene nanoribbons. Furthermore, since the ferromagnetic properties sensitively depends on the carrier concentration, it can be manipulated at ease by electric gates. The resultant ferromagnetic state with metallic conductivity is not only surprising from an academic viewpoint, but also has potential applications in spintronics at nanoscale.

arXiv comment10 pages, 5 figures

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Cited by in corpus (19)

• Properties of Graphene: A Theoretical Perspective
• Strongly correlated flat-band systems: The route from Heisenberg spins to Hubbard electrons
• Flat band superconductivity in strained Dirac materials
• Low-temperature properties of the Hubbard model on highly frustrated one-dimensional lattices
• Dirac point resonances due to atoms and molecules adsorbed on graphene and transport gaps and conductance quantization in graphene nanoribbons with covalently bonded adsorbates
• Electronic transport through a graphene-based ferromagnetic/normal/ferromagnetic junction
• Tunable Band Structure Effects on Ballistic Transport in Graphene Nanoribbons
• Josephson effect in Graphene SNS Junction with a Single Localized Defect
• Strain-tuning of edge magnetism in zigzag graphene nanoribbons
• Tunneling Conductance of The Graphene SNS Junction with a Single Localized Defect
• Coherent transport of armchair graphene constrictions
• Dispersion-driven ferromagnetism in a flat-band Hubbard system
• Weak ferromagnetism of antiferromagnetic domains in graphene with defects
• Models of Strong Interaction in Flat-Band Graphene Nanoribbons: Magnetic Quantum Crystals
• Jastrow-Correlated Wavefunctions for Flat-Band Lattices
• Spintronic properties of one-dimensional electron gas in graphene armchair ribbons
• Ferromagnetism in armchair graphene nanoribbon heterostructures
• Ferromagnetism without flat bands in thin armchair nanoribbons
• Quantum impurity with 2/3 local moment in 1D quantum wires: an NRG study