W Kirsch, M Krishna
Lifshitz Tails for Interband Light Absorption Coefficient
(247K, pdf)

ABSTRACT.  In this paper we consider the Interband Light Absorption Coefficient 
for various models. We show that at the lower and upper edges of the spectrum 
the Lifshitz tails behaviour of the density of states implies similar behaviour 
for the ILAC at appropriate energies. The Lifshitz tails property is also exhibited at some 
points corresponding to the internal band edges of the density of states.