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From clean to diffusive mesoscopic systems: A semiclassical approach to the magnetic susceptibility

Edward McCann·Klaus Richter
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Abstract

We study disorder-induced spectral correlations and their effect on the magnetic susceptibility of mesoscopic quantum systems in the non-diffusive regime. By combining a diagrammatic perturbative approach with semiclassical techniques we perform impurity averaging for non-translational invariant systems. This allows us to study the crossover from clean to diffusive systems. As an application we consider the susceptibility of non-interacting electrons in a ballistic microstructure in the presence of weak disorder. We present numerical results for a square billiard and approximate analytic results for generic chaotic geometries. We show that for the elastic mean free path $\ell$ larger than the system size, there are two distinct regimes of behaviour depending on the relative magnitudes of $\ell$ and an inelastic scattering length.

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Edward McCann, Klaus Richter. 1998-06-18. From clean to diffusive mesoscopic systems: A semiclassical approach to the magnetic susceptibility. https://doi.org/10.1209/epl%2Fi1998-00347-0

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