Anderson mobility gap probed by dynamic coherent backscattering
L. A. Cobus, S. E. Skipetrov, A. Aubry, B. A. van Tiggelen, A. Derode,, J. H. Page
TL;DR
This study employs dynamic coherent backscattering to investigate the Anderson mobility gap in disordered mesoglasses, estimating localization lengths across frequencies and confirming findings with transmission measurements.
Contribution
It introduces a method to probe the Anderson mobility gap and estimate localization lengths in three-dimensional disordered materials using dynamic coherent backscattering.
Findings
Localization length varies with frequency across the mobility gap.
Experimental results agree with the self-consistent theory of localization.
Transmission measurements support the dynamic backscattering findings.
Abstract
We use dynamic coherent backscattering to study one of the Anderson mobility gaps in the vibrational spectrum of strongly disordered three-dimensional mesoglasses. Comparison of experimental results with the self-consistent theory of localization allows us to estimate the localization (correlation) length as a function of frequency in a wide spectral range covering bands of diffuse transport and a mobility gap delimited by two mobility edges. The results are corroborated by transmission measurements on one of our samples.
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