By combining our recent results on the electronic structure for disordered systems, and the constancy of the matrix elements, we show that the Urbach tail arises from states localized by fluctuations on single sites and not from Halperin-Lax tail states.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry