Crystallography: Unit Cells, Lattices, and Reciprocal Lattice

This lecture covers the fundamental concepts of crystallography, including unit cells, fractional coordinates, lattices, and lattice planes. The instructor explains how to define periodic structures, distinguish between different types of lattices, and generate supercells. The lecture also delves into the reciprocal lattice in 2D, discussing the relationship between direct and reciprocal lattices and the concept of constructive interference. Practical examples and exercises are provided to enhance understanding.