Scaling properties of induced density of chiral and non-chiral Dirac fermions in magnetic fields

Abstract

We find that a repulsive potential of graphene in the presence of a magnetic field has bound states that are peaked inside the barrier with tails extending over \ell(N + 1), where \ell and N are the magnetic length and Landau level(LL) index. We have investigated how these bound states affect scaling properties of the induced density of filled Landau levels of massless Dirac fermions. For chiral fermions we find, in strong coupling regime, that the density inside the repulsive potential can be greater than the value in the absence of the potential while in the weak coupling regime we find negative induced density. Similar results hold also for non-chiral fermions. As one moves from weak to strong coupling regimes the effective coupling constant between the potential and electrons becomes more repulsive, and then it changes sign and becomes attractive. Different power-laws of induced density are found for chiral and non-chiral fermions.

Phys. Rev. B 84 085405 (2011)

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Cited by in corpus (6)

• Tunable quantum dots in monolayer graphene
• Coulomb impurity problem of graphene in magnetic fields
• Topological gap states of semiconducting armchair graphene ribbons
• Spintronic properties of one-dimensional electron gas in graphene armchair ribbons
• Resonant, non-resonant, and anomalous states of Dirac electrons in a parabolic well in the presence of magnetic fields
• Impurity cyclotron resonance of anomalous Dirac electrons in graphene