TY - JOUR
T1 - Comment on mott’s localization criterion for disordered systems
AU - Antoniou, P. D.
AU - Cohen, Morrel H.
AU - Jortner, Joshua
N1 - Funding Information:
t Research supported by NSF Grant DMR75-13343, the L. Block Fund, and the Materials Research Laboratory of the National Science Foundation at The University of Chicago, U.S.A.
PY - 1977/5
Y1 - 1977/5
N2 - We investigate the validity of Mott’s localization criterion originally applied by him when a pseudogap opens. Values of the ratio η(Ec) of the perturbed to the unperturbed density of states at the mobility edges are obtained via approximate numerical calculations. They suggest that η, while slowly varying with disorder, is a function of the kind of disorder, the probability distribution of the disorder and the kind of mobility edge, exterior or interior to the band. The value of η for the interior mobility edges is found to be approximately2/3 rather than1/3. The value of η approaches1/3 as the exterior mobility edge approaches the band edge, when the density of states become free-electron like and η becomes equivalent to Mott’s g. The product of the transfer integral for nearest neighbours with the density of states at the mobility edge is found to be practically constant for the interior mobility edges.
AB - We investigate the validity of Mott’s localization criterion originally applied by him when a pseudogap opens. Values of the ratio η(Ec) of the perturbed to the unperturbed density of states at the mobility edges are obtained via approximate numerical calculations. They suggest that η, while slowly varying with disorder, is a function of the kind of disorder, the probability distribution of the disorder and the kind of mobility edge, exterior or interior to the band. The value of η for the interior mobility edges is found to be approximately2/3 rather than1/3. The value of η approaches1/3 as the exterior mobility edge approaches the band edge, when the density of states become free-electron like and η becomes equivalent to Mott’s g. The product of the transfer integral for nearest neighbours with the density of states at the mobility edge is found to be practically constant for the interior mobility edges.
UR - http://www.scopus.com/inward/record.url?scp=84967189733&partnerID=8YFLogxK
U2 - 10.1080/14786437708232967
DO - 10.1080/14786437708232967
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AN - SCOPUS:84967189733
SN - 0031-8086
VL - 35
SP - 1435
EP - 1440
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 5
ER -