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Science 21 February 1986:
Vol. 231. no. 4740, pp. 814 - 819
DOI: 10.1126/science.231.4740.814
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Articles

Dynamics of Fractal Networks

R. ORBACH 1

1 Department of Physics, University of California, Los Angeles 90024.

Random structures often exhibit fractal geometry, defined in terms of the mass scaling exponent, D, the fractal dimension. The vibrational dynamics of fractal networks are expressed in terms of the exponent d, the fracton dimensionality. The eigenstates on a fractal network are spatially localized for d less than or equal to 2. The implications of fractal geometry are discussed for thermal transport on fractal networks. The electron-fracton interaction is developed, with a brief outline given for the time dependence of the electronic relaxation on fractal networks. It is suggested that amorphous or glassy materials may exhibit fractal properties at short length scales or, equivalently, at high energies. The calculations of physical properties can be used to test the fractal character of the vibrational excitations in these materials.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)