Wednesday, July 10, 2013

1307.2286 (A. J. Martinez-Mendoza et al.)

Scattering and transport properties of tight-binding random networks    [PDF]

A. J. Martinez-Mendoza, A. Alcazar-Lopez, J. A. Mendez-Bermudez
We study numerically scattering and transport statistical properties of tight-binding random networks characterized by the number of nodes $N$ and the average connectivity $\alpha$. We use a scattering approach to electronic transport and concentrate on the case of a small number of single-channel attached leads. We observe a smooth crossover from insulating to metallic behavior in the average scattering matrix elements $\bra |S_{mn}|^2 \ket$, the conductance probability distribution $w(T)$, the average conductance $\bra T \ket$, the shot noise power $P$, and the elastic enhancement factor $F$ by varying $\alpha$ from small ($\alpha \to 0$) to large ($\alpha \to 1$) values. We also show that all these quantities are invariant for fixed $\xi=\alpha N$. Moreover, we proposes a heuristic and universal relation between $\bra |S_{mn}|^2 \ket$, $\bra T \ket$, and $P$ and the disorder parameter $\xi$.
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