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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

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Published on: July 29, 2013

Delocalization by disorder in layered systems.

Dmitrii L Maslov¹, Vladimir I Yudson, Andres M Somoza

¹Department of Physics, University of Florida, Post Office Box 118440, Gainesville, Florida 32611-8440, USA.

Physical Review Letters

|June 13, 2009

Summary

This summary is machine-generated.

We modeled conductivity anisotropy in layered materials using potential barriers and impurities. Bulk disorder enables finite out-of-plane conductivity, which has a non-Drude AC response, offering insights into electronic transport.

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Area of Science:

Condensed matter physics
Materials science
Solid-state physics

Background:

Layered materials exhibit large conductivity anisotropy.
Stacking faults and impurities can significantly influence electronic properties.
Understanding charge transport in disordered systems is crucial.

Purpose of the Study:

To develop a model for conductivity anisotropy in layered materials.
To investigate the role of potential barriers (stacking faults) and bulk disorder.
To analyze the out-of-plane conductivity and its frequency dependence.

Main Methods:

Numerical and analytical solution of a disordered 1D system model.
Modeling randomly spaced potential barriers and isotropic impurities.
Exact solution for conductivity in a one-dimensional disordered system.

Main Results:

Electron motion is localized out-of-plane without bulk disorder.
Bulk disorder suppresses localization, leading to finite out-of-plane conductivity.
Out-of-plane conductivity scales linearly with bulk impurity scattering rate.
AC conductivity exhibits a non-Drude form with a finite zero-frequency real part and a peak.

Conclusions:

The proposed model explains conductivity anisotropy in layered materials.
Bulk disorder is essential for achieving finite out-of-plane conductivity.
The non-Drude AC conductivity response provides a unique signature of the interplay between different types of disorder.