2018/04/19 by K. E. Çakmak, A. Altıntaş, Abdulmenaf Altıntaş +1
Materials Science · Physics and Astronomy · #Antiferromagnetism #Atomic physics #Condensed matter physics #Excitation #Ferromagnetism #Geometry #Graphene #Graphene nanoribbons #Graphene research and applications #Ground state #Lattice (music) #Magnetic field #Materials science #Nanotechnology #Physics #Quantum and electron transport phenomena #Ribbon #Topological Materials and Phenomena #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.98.115428
published as Phys. Rev. B 98, 115428 (2018) · 5 pages, 4 figures
arxiv created 2018/04/19 · openalex created_date 2018/04/24 · openalex publication_date 2018/09/17 · arxiv updated 2018/09/25 · openalex updated_date 2026/08/05
We investigate the effects of randomly distributed atomic defects on the magnetic properties of graphene nanoribbons with zigzag edges using an extended mean-field Hubbard model. For a balanced defect distribution among the sublattices of the honeycomb lattice in the bulk region of the ribbon, the ground-state antiferromagnetism of the edge states remains unaffected. By analyzing the excitation spectrum, we show that while the antiferromagnetic ground state is susceptible to single spin-flip excitations from edge states to magnetic defect states at low defect concentrations, its overall stability is enhanced with respect to the ferromagnetic phase.