- Condensed Matter Physics
Many properties of metals can remarkably be understood in terms of “free” electrons, even though electrons interact with each other through a Coulomb force, which can be both large and long ranged. It turns out that these interactions collectively result in the emergence of “quasiparticles” whose behavior is very similar to that of free, non-interacting electrons. This description forms the basis of the famous Landau Fermi liquid theory. In fact, the notion of finding new non-interacting quasiparticles to describe complicated interacting systems is a key paradigm in condensed matter physics.