2014/05/05 by R. Farghadan, A. Saffarzadeh · 20 citations
Materials Science · Physics and Astronomy · #Electric field #Graphene #Graphene research and applications #Hamiltonian (control theory) #Magnetic field #Magnetization #Nanoring #Quantum #Quantum and electron transport phenomena #Spin (aerodynamics) #Topological Materials and Phenomena #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4874939
published in Journal of Applied Physics 115(17) (American Institute of Physics) · 5 pages, 5 figures
openalex publication_date 2014/05/05 · arxiv created 2014/08/28 · arxiv updated 2014/08/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The electric-field effect on the electronic and magnetic properties of triangular and hexagonal graphene quantum rings with zigzag edge termination is investigated by means of the single-band tight-binding Hamiltonian and the mean-field Hubbard model. It is shown how the electron and spin states in the nanoring structures can be manipulated by applying an electric field. We find different spin-depolarization behaviors with variation of electric field strength due to the dependence of spin densities on the shapes and edges of this kind of nanorings. In the case of triangular quantum rings, the magnetization on the inner and outer edges can be selectively tuned and the spin states depolarize gradually as the field strength is increased, while in the case of hexagonal nanorings, the transverse electric field reduces the magnetic moments on both inner and outer edges symmetrically and rapidly.