Spectral approach to transport in the 2D honeycomb lattice with substitutional disorder
Autor: | Kostadinova, E G, Liaw, C D, Hering, A S, Cameron, A, Guyton, F, Matthews, L S, Hyde, T W |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | Phys. Rev. B 99, 024115 (2019) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevB.99.024115 |
Popis: | The transport properties of a disordered two-dimensional (2D) honeycomb lattice are examined numerically using the spectral approach to the quantum percolation problem, characterized by an Anderson-type Hamiltonian. In our simulations, substitutional disorder (or doping) is represented by a modified bimodal probability distribution of the on-site energies. The results indicate the existence of extended energy states for nonzero disorder and the emergence of a transition towards localized behavior for critical doping concentration n_D>0.3%, in agreement with the experimentally observed metal-to-insulator transition in graphene sheet doped with hydrogen. Comment: 21 pages, 9 figures |
Databáze: | arXiv |
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