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Type: Artigo de periódico
Title: Splitting of critical energies in the n=0 Landau level of graphene
Author: Pereira, ALC
Abstract: The lifting of the degeneracy of states from the graphene n = 0 Landau level (LL) is investigated through a non-interacting tight-binding model with random hoppings. A disorder-driven splitting of two bands and of two critical energies is observed by means of density of states and participation ratio calculations. The analysis of the probability densities of the states within the n = 0 LL provides some insights into the interplay of lattice and disorder effects on the splitting process. An uneven spatial distribution of the wavefunction amplitudes between the two graphene sublattices is found for the states in between the two split peaks. It is shown that as the splitting is increased (linear increasing with disorder and square root increasing with magnetic field), the two split levels also get increasingly broadened, in such a way that the proportion of overlapped states remains approximately constant for a wide range of disorder or magnetic field variation.
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: New Journal Of Physics. Iop Publishing Ltd, v. 11, 2009.
Rights: aberto
Identifier DOI: 10.1088/1367-2630/11/9/095019
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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