Solid State Physics
Solid state physics is the branch of condensed matter physics that studies the physical properties of rigid, solid materials. It primarily focuses on crystalline solids, where atoms are arranged in a highly ordered, repeating lattice structure. By applying principles of quantum mechanics, electromagnetism, and statistical mechanics, this field explains how the collective interactions of atoms give rise to the large-scale electrical, magnetic, optical, and thermal properties of materials, forming the theoretical foundation for modern electronics and materials science.