Quantum transport in defective phosphorene nanoribbons: effects of atomic vacancies
16 January 2018
University of Antwerp - Campus Groenenborger - Room U.244 - Groenenborgerlaan 171 - 2020 Antwerpen
4:00 PM - 5:00 PM
Organization / co-organization:
Condensed Matter Theory
Condensed Matter Theory seminar presented by Dr Longlong Li
Defects are almost inevitably present in realistic materials and defective materials are expected to exhibit very different properties than their non-defective (perfect) counterparts. Here, using a combination of the tight-binding approach and the scattering matrix formalism, we investigate the electronic transport properties of defective phosphorene nanoribbons (PNRs) containing atomic vacancies.
In the presence of random vacancies, three different transport regimes are identified: ballistic, diffusive and Anderson localized ones. In particular, zigzag PNRs that are known to be metallic due to the presence of edge states become semiconducting: edge conductance is vanishing and transport gaps are induced due to Anderson localization. Moreover, we find that for a fixed vacancy concentration, both armchair and zigzag PNRs of narrower width and/or longer length are more sensitive to vacancy disorder than their wider and/or shorter counterparts, and that for the same ribbon length and width, zigzag PNRs are more sensitive to vacancy disorder than armchair ones.
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