The Dulong-Petit law incorrectly predicts constant heat capacity at low temperatures.

Amazon.com: Kittel's Introduction to Solid State Physics, Global Edition

Introduction to Solid State Physics by Charles Kittel: The Ultimate PPT Presentation Guide

Appendix / Supplementary slides

Understanding the dispersion relation.

Why some materials are insulators (large gap) and others are conductors (no gap). Bloch’s Theorem:

Modern slides now often include interactive color maps of the First Brillouin Zone for BCC and FCC structures. 2. Phonons and Lattice Vibrations

A mathematical Fourier transform of the real-space lattice. Real space distance translates to in reciprocal space.

define a Fourier space where crystal diffraction patterns exist.

The latest PPTs align notation with modern condensed matter journals (e.g., using $\hbar$ consistently and modern SI units for magnetic fields).