2020/08/11 by Ma Luo
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Excited state #Ferromagnetism #Geometry #Graphene #Graphene research and applications #Lattice (music) #Magnetism #Materials science #Mathematics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Spintronics #Topological Materials and Phenomena #Topology (electrical circuits) #Zigzag #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.102.075421
published as Phys. Rev. B 102, 075421 (2020) · 8 figures
openalex publication_date 2020/08/11 · arxiv created 2020/08/12 · arxiv updated 2020/08/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The topological phases of graphene with spin-orbit coupling, an exchange field, and a staggered-sublattice potential determine the properties of the edge states of the zigzag nanoribbon. In the presence of the Hubbard interaction, the spontaneous magnetization at the zigzag terminations induces sizable magnetic moments at the lattice sites in the bulk region. Thus, the exchange field and staggered-sublattice potential in the bulk region are effectively changed, which in turn change the topological phase. Within a certain parameter regime, quasistable excited states of the zigzag nanoribbon exist, which have a different magnetism configuration at the zigzag terminations from the ground state. The quasistable excited states could effectively suppress the finite-size effect of the topological edge states. The investigation of the topological edge states in the presence of interaction helps the engineering of spintronic nanodevices based on realistic materials.