Critical behavior of density of states near Fermi energy in low-dimensional disordered metals

2009/08/21 by E. Sasioglu, S. Caliskan, M. Kumru · 2 citations
Physics and Astronomy · #cond-mat.str-el #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.79.035123

published as Phys. Rev. B 79, 035123 (2009) · 8 pages, 4 figures

arxiv created 2009/08/21 · arxiv updated 2015/05/14

Abstract

We study the effect of electron-electron interaction on the one-particle density of states (DOS) ρ^(d)(ε,T) of low-dimensional disordered metals near Fermi energy within the framework of the finite temperature conventional impurity diagram technique. We consider only diffusive limit and by a geometric re-summation of the most singular first order self-energy corrections via the Dyson equation we obtain a non-divergent solution for the DOS at low energies, while for higher energies the well-known Altshuler-Aronov corrections are recovered. At the Fermi level ρ^(d)(ε,T=0)→ 0, this indicates that interacting disordered two- and quasi-one-dimensional systems are in insulating state at zero temperature. The obtained results are in good agreement with recent tunneling experiments on two-dimensional GaAs/AlGaAs heterostructures and quasi-one-dimensional doped multiwall carbon nanotubes.

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