Fano resonances in hexagonal zigzag graphene rings under external magnetic flux

Abstract

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.

To appear in JPCM

References in corpus (8)

• The electronic properties of graphene
• Aharonov-Bohm effect and broken valley-degeneracy in graphene rings
• Inner and outer edge states in graphene rings: A numerical investigation
• Gaussian deformations in graphene ribbons: flowers and confinement
• Transport modulation of graphene nanoribbons with side-attached organic molecules
• Chiral bound states in the continuum
• Transport properties of graphene quantum dots
• Suppression of decoherence in a graphene monolayer ring

Cited by in corpus (8)

• Aharonov-Bohm effect in monolayer black phosphorus (phosphorene) nanorings
• Graphene kirigami as a platform for stretchable and tunable quantum dot arrays
• Aharonov-Bohm interferometer based on n-p junction in graphene nanoribbons
• Band bending and zero-conductance resonances controlled by edge electric fields in zigzag silicene nanoribbons
• Tuning transport properties on graphene multi-terminal structures by mechanical deformations
• Electromagnetic prompt response in an elastic wave cavity
• Interferometry of Klein tunnelling electrons in graphene quantum rings
• The influence of Gaussian strain on sublattice selectivity of impurities in graphene