This course is introductory solid state physics for seniors of the physical sciences. In the years since the first lecture was presented the field has developed vigorously, and there are notable applications. The challenge to the lecture has been to treat significant new areas while maintaining the tntroductory level of the lecture. It would be a lucky to present such a physical field as a homework.

In this semester we will study five topics which include crystal structure, wave diffraction, crystal binding, phonons, and free electron fermi gas. In the first half of the semester most of lecture will be focused on basic concept of crystal structure based on classical theory. In the second half of the semester we will face on the failure of the classical theory and introduce new model by employing quantum mechanics. The subjects which have been treated in this semester will be applied to specific materials such as semiconductor, superconductor, and magnetism in next semester.