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arXiv · 2210.07999

Scattering Expansion for Localization in One Dimension

Adrian B. Culver·Pratik Sathe·Rahul Roy
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Abstract

We present a perturbative approach to disordered systems in one spatial dimension that accesses the full range of phase disorder and clarifies the connection between localization and phase information. We consider a long chain of identically disordered scatterers and expand in the reflection strength of any individual scatterer. As an example application, we show analytically that in a discrete-time quantum walk, the localization length can depend non-monotonically on the strength of phase disorder (whereas expanding in weak disorder yields monotonic decrease). More generally, we obtain to all orders in the expansion a particular non-separable form for the joint probability distribution of the transmission coefficient logarithm and reflection phase. Furthermore, we show that for weak local reflection strength, a version of the scaling theory of localization holds: the joint distribution is determined by just three parameters.

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Adrian B. Culver, Pratik Sathe, Rahul Roy. 2022-10-14. Scattering Expansion for Localization in One Dimension. https://doi.org/10.1103/physrevb.109.l060201

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