Publication Date

5-1-2008

Advisor(s)

Kottos, Tsampikos

Major

Physics

Language

English

Abstract

In the studies of conductance of closed mesoscopic systems, semilinear response theory offers a novel unified framework that goes beyond the traditional Kubo formulation. Here we apply SLRT to two mesoscopic systems. The first is disordered quasi-1d rings, where we build an analytical model to understand the departure of SLRT from Kubo results. Guided by the numerical analysis on the statistical properties of the current operator matrix elements, we introduce a random matrix theory model which leads to a generalized variable range hopping picture of the conductance. Both of these models capture the essential aspects of the mesoscopic conductance for this system. The second one is the Harper model, which is a one-dimensional model that exhibits a Metal-Insulator transition--at the critical point, it possesses fractal structures in both the eigenfunctions and the eigenvalues. We are interested in studying how the fractal structures might have an effect on the conductance.

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