Definition of "quasiparticle" []

• Any entity that has some characteristics of a distinct particle, but comprises a grouping of multiple particles (noun)

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• "In the process of this screening, both types of electrons actually clump together to form a composite object, or quasiparticle, which is very heavy."
• "For example, in both systems, when an electron at the lowest possible energy level is excited (by a photon or another particle), the resulting interaction between the electron and the hole left behind cannot be described as a quasiparticle (as it can in ordinary metals), because the electron excitation decays so quickly."
• "(by a photon or another particle), the resulting interaction between the electron and the hole left behind cannot be described as a quasiparticle (as it can in ordinary metals), because the electron excitation decays so quickly."