Fermi–Tomonaga theory

Fermi–Tomonaga theory is a quantum model describing how electrons interact with each other in metals and conductors. It combines the ideas from Enrico Fermi, who studied electrons as a gas of particles, and Sin-itiro Tomonaga, who developed methods to analyze their complex interactions using quantum mechanics. This theory explains important properties like electrical conductivity and heat capacity by accounting for the collective behavior of electrons and their mutual interactions, providing a foundational understanding of how electrons behave in solid materials at a quantum level.