Quasiparticle
A quasiparticle is an excitation of a many-particle system that has an energy-momentum relation.
Explanation
Quasiparticles are characterized by the fact that they cannot occur outside their many-particle system. A quasiparticle is therefore not an elementary particle.
It is only a mathematical instrument to describe more easily the movement and interaction of particles in a solid.
HistoryThe concept of quasiparticles was developed by the Soviet physicist Lev Landau en (1908 - 1968). |