Macroscopic conductivity of free fermions in disordered media

Autor(es)

Bru, J. -B. ^{[1, 2, 3]} ; de Siqueira Pedra, W. ^[4] ; Hertling, C. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Basque Country, Dept Matemat, Fac Ciencia & Tecnol, E-48080 Bilbao - Spain

^[2] Basque Fdn Sci, Ikerbasque, Bilbao 48011 - Spain

^[3] BCAM Basque Ctr Appl Math Mazarredo, Bilbao 48009 - Spain

^[4] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, BR-05314970 Sao Paulo 16 - Brazil

^[5] Johannes Gutenberg Univ Mainz, FB Inst Math 08, Mainz - Germany

• Tipo de documento: Artigo de Revisão
• Fonte: REVIEWS IN MATHEMATICAL PHYSICS; v. 26, n. 5 JUN 2014.
• Citações Web of Science: 5

Resumo

We conclude our analysis of the linear response of charge transport in lattice systems of free fermions subjected to a random potential by deriving general mathematical properties of its conductivity at the macroscopic scale. The present paper belongs to a succession of studies on Ohm and Joule's laws from a thermodynamic viewpoint starting with {[}1-3]. We show, in particular, the existence and finiteness of the conductivity measure mu(Sigma) for macroscopic scales. Then we prove that, similar to the conductivity measure associated to Drude's model, mu(Sigma) converges in the weak{*}-topology to the trivial measure in the case of perfect insulators (strong disorder, complete localization), whereas in the limit of perfect conductors (absence of disorder) it converges to an atomic measure concentrated at frequency nu = 0. However, the AC-conductivity mu(Sigma)vertical bar(R\textbackslash{}[0]) does not vanish in general: We show that mu(Sigma)(R\textbackslash{}[0]) > 0, at least for large temperatures and a certain regime of small disorder. (AU)

• Processo FAPESP: 13/13215-5 - Produção de calor em sistemas fermiônicos infinitos sujeitos a campos elétricos
• Beneficiário: Walter Alberto de Siqueira Pedra
• Modalidade de apoio: Auxílio à Pesquisa - Regular