Accession Number : AD0697007
Title : LOCAL THEORY OF DISORDERED SYSTEMS.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
Personal Author(s) : Butler,William H. ; Kohn,Walter
Report Date : 10 NOV 1969
Pagination or Media Count : 19
Abstract : The most striking characteristic of crystalline solids is their periodicity. As a result of this feature, theoretical descriptions of physical phenomena in such systems are usually given in wave number of momentum space. The reciprocal lattice of a crystal and the Fermi surface of a metal are examples. In a disordered system, on the other hand, there is no such periodicity and momentum space descriptions are much less natural. However, in such systems, physical conditions near a point r, in coordinate space, become independent of the conditions at a distant point r', provided that (the absolute value of (r' -r) is large compared to either a characteristic mean free path or some other appropriate length. This suggests that one can analyze a macroscopic disordered system by averaging over the properties of microscopic neighborhoods. The present paper reports some details of such a program which has focused especially on the electronic density of states.
Descriptors : (*SOLID SOLUTIONS, MOLECULAR ASSOCIATION), ALLOYS, CRYSTAL STRUCTURE, BAND THEORY OF SOLIDS, TOPOLOGY
Subject Categories : Atomic and Molecular Physics and Spectroscopy
Solid State Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE