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Disorder information from conductance: A quantum inverse problem

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Autor(es):
Mukim, S. ; Amorim, F. P. ; Rocha, A. R. ; Muniz, R. B. ; Lewenkopf, C. ; Ferreira, M. S.
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: PHYSICAL REVIEW B; v. 102, n. 7, p. 6-pg., 2020-08-05.
Resumo

It is straightforward to calculate the conductance of a quantum device once all its scattering centers are fully specified. However, to do this in reverse, i.e., to find information about the composition of scatterers in a device from its conductance, is an elusive task. This is particularly more challenging in the presence of disorder. Here we propose a procedure in which valuable compositional information can be extracted from the seemingly noisy spectral conductance of a two-terminal disordered quantum device. In particular, we put forward an inversion methodology that can identify the nature and respective concentration of randomly-distributed impurities by analyzing energy-dependent conductance fingerprints. Results are shown for graphene nanoribbons as a case in point using both tight-binding and density functional theory simulations, indicating that this inversion technique is general, robust, and can be employed to extract structural and compositional information of disordered mesoscopic devices from standard conductance measurements. (AU)

Processo FAPESP: 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte
Beneficiário:Adalberto Fazzio
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica
Beneficiário:Nathan Jacob Berkovits
Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
Processo FAPESP: 17/10292-0 - Simulações atomísticas em eletroquímica
Beneficiário:Luana Sucupira Pedroza
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores