Granularity in Narrow Wires: Conductance Fluctuations, Diffuse Boundaries and Junction Scattering

摘要: Many factors determine the electrical conductivity of a narrow wire. In weakly disordered system we can begin with Drude conductivity, σ=ne2τ/m, and add corrections which take account various aspects transport not included in this simple expression (see Fig. 1). For instance, disorder induced arise from quantum interference electron-electron interaction, generally lowering conductivity. The arises because coherent backscattering electrons reduces diffusion coefficient below classical result (D = vF l /2 for specular scattering) while interaction lowers density states at Fermi energy. We rewrite terms coefficient, D, states, N(EF), as σ e2DN(EF) provided are small, δσ/σ ~ δD/D + δN/N(EF), so that two additive.