Destruction of Landau levels in asymmetric bilayer nanographene ribbons

摘要: Magneto-electronic properties of asymmetric bilayer nanographene ribbons are enriched by geometric structures, interlayer atomic interactions, magnetic quantization and finite-size confinement. There drastic changes on the band symmetry, degeneracy partial flat bands, number band-edge states, energy dispersion, carrier density, spatial symmetry wave function. Quasi-Landau levels might be converted into oscillating bands where extra states created. When upper ribbon is located at centre, Landau functions completely destroyed. Meanwhile, a charge transfer between different layers or sublattices in same layer occurs. Furthermore, density reflecting structure, also severely altered terms number, energy, height prominent peaks.