Narrow gap semiconductors have provided an exciting field of research and show a number of extreme physical and material characteristics. They are the established material systems for infrared detectors and emitters, and with new developments in the technology these materials are emerging as a viable route to high speed, low power electronics. New kinds of narrow gap semiconductor, such as graphene and other composite nanocrystals, are also providing renewed interest in the underlying physics. The Thirteenth International Conference on Narrow Gap Semiconductors (NGS-13) was held at the...