Landau Fermi Liquid Theory

Landau Fermi Liquid Theory describes how electrons behave inside certain metals at low temperatures. Instead of acting like free particles, electrons interact but still move as if they are 'quasiparticles' with slightly modified properties—such as mass and lifetime—due to interactions. These quasiparticles retain many characteristics of free electrons, allowing us to predict the metal’s electrical and thermal behavior accurately. The theory explains why many metals conduct electricity well and remain stable, even with complex electron interactions, by treating the collective system as a 'liquid' of these interacting quasiparticles.