Lifshitz tails for the Interband Light Absorption Coefficient

TL;DR

This paper investigates how Lifshitz tails in the density of states influence the interband light absorption coefficient at spectral edges, revealing tail behavior at various energy points.

Contribution

It establishes a connection between Lifshitz tails in the density of states and the behavior of the ILAC at spectral edges and internal band edges.

Findings

Lifshitz tails imply similar tail behavior in ILAC at spectrum edges.

Lifshitz tails are observed at internal band edges.

The study extends understanding of spectral tail phenomena in optical properties.

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.