Solid State Physics, Volume 68 provides the latest information on a branch of physics that is primarily devoted to the study of matter in its solid phase, especially at the atomic level. Chapters in this updated volume include new research in the use of phonon-polaritons in polar materials to do plasmonic like studies, but without the plasmons, along with a section on Polar oxide interfaces. This prestigious serial presents timely and state-of-the-art reviews pertaining to all aspects of solid state physics.