2014/09/30 by D. Faria, D Faria, R. Carrillo-Bastos +5
Materials Science · Physics and Astronomy · #Fano plane #Fano resonance #Graphene #Graphene research and applications #Hamiltonian (control theory) #Local density of states #Magnetic field #Magnetic flux #Quantum and electron transport phenomena #Topological Materials and Phenomena #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1088/0953-8984/27/17/175301
published as J. Phys.: Condens. Matter 27 175301 (2015) · To appear in JPCM
arxiv created 2015/03/02 · openalex publication_date 2015/04/02 · openalex created_date 2016/06/24 · arxiv updated 2017/01/09 · openalex updated_date 2026/08/06
We study transport properties of hexagonal zigzag graphene quantum rings connected to semi-infinite nanoribbons. Open two-fold symmetric structures support localized states that can be traced back to those existing in the isolated six-fold symmetric rings. Using a tight-binding Hamiltonian within the Green's function formalism, we show that an external magnetic field promotes these localized states to Fano resonances with robust signatures in transport. Local density of states and current distributions of the resonant states are calculated as a function of the magnetic flux intensity. For structures on corrugated substrates we analyze the effect of strain by including an out-of-plane centro-symmetric deformation in the model. We show that small strains shift the resonance positions without further modifications, while high strains introduce new ones.