Optical and electrical properties of nanoscale materials This book covers the optical and electrical properties of nanoscale materials with an emphasis on how new and unique material properties result from the special nature of their electronic band structure. Beginning with a review of the optical and solid state physics needed for understanding optical and electrical properties the book then introduces the electronic band structure of solids and discusses the effect of spin orbit coupling on the valence band which is critical for understanding the optical properties of most nanoscale materials. Excitonic effects and excitons are also presented along with their effect on optical absorption. 2D materials such as graphene and transition metal dichalcogenides are host to unique electrical properties resulting from the electronic band structure. This book devotes significant attention to the optical and electrical properties of 2D and topological materials with an emphasis on optical measurements electrical characterization of carrier transport and a discussion of the electronic band structures using a tight binding approach. This book succinctly compiles useful fundamental and practical information from one of the fastest growing research topics in materials science and is thus an essential compendium for both students and researchers in this rapidly moving field. Introduction – Optical Properties of Solids The Dielectric Function at Optical Frequencies– A First Look Introduction to the Electronic Band Structure of Solids Microscopic Theory of the Dielectric Function Excitons and Excitonic Effects in Semiconductors Optical Measurements Hall Effect Measurements of 2D Electron Gas and 2D Materials Optical and Electrical Properties of van der Waals 2D Nanoscale Materials The Optical and Electrical Properties of Topological Materials.