Valley polarization effects on the localization in graphene Landau levels

Details Valley polarization effects on the localization in graphene Landau levels Valley polarization effects on the localization in graphene Landau levels

2007-06-19

arxiv.org/abs/0706.2856v2

Phys. Rev. B 77, 075416 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures, extended version, with 2 new figures added

Scientific paper

10.1103/PhysRevB.77.075416

Effects of disorder and valley polarization in graphene are investigated in the quantum Hall regime. We find anomalous localization properties for the lowest Landau level (LL), where disorder can induce wavefunction delocalization (instead of localization), both for white-noise and gaussian-correlated disorder. We quantitatively identify the contribution of each sublattice to wavefunction amplitudes. Following the valley (sublattice) polarization of states within LLs for increasing disorder we show: (i) valley mixing in the lowest LL is the main effect behind the observed anomalous localization properties, (ii) the polarization suppression with increasing disorder depends on the localization for the white-noise model, while, (iii) the disorder induces a partial polarization in the higher Landau levels for both disorder models.

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