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|Type:||Artigo de periódico|
|Title:||Short-range order in linear binary alloys: Delocalization of states versus memory of ordered band structures|
|Abstract:||We discuss the electronic properties of a one-dimensional tight-binding model for binary alloys with correlated disorder. The correlation inhibits the bonds between atoms of one of the atomic species, leading to what is called repulsive binary alloys. As it is well known, the transmission probability of repulsive binary alloys shows resonances due to the delocalization of states in this peculiar disordered one-dimensional system. We show that this delocalization can be related to the memory of the band structures of different ordered chains, since short segments of these ordered chains constitute the repulsive binary alloy. This memory effect is revealed in the localization length as a function of energy. The same argument is used to show that competing correlations in the same linear chain destroy delocalization, as can be inferred from the properties of binary alloys with no correlations at all. We also show that, complementary to delocalized bands, smooth transmission gaps should also exist at specific energy ranges only for correlated disorder cases.|
|Editor:||American Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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