Definitions for quasiparticle
This page provides all possible meanings and translations of the word quasiparticle
a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle
Any entity that has some characteristics of a distinct particle, but comprises a grouping of multiple particles
In physics, quasiparticles and collective excitations are emergent phenomena that occur when a microscopically complicated system such as a solid behaves as if it contained different weakly interacting particles in free space. For example, as an electron travels through a semiconductor, its motion is disturbed in a complex way by its interactions with all of the other electrons and nuclei; however it approximately behaves like an electron with a different mass traveling unperturbed through free space. This "electron" with a different mass is called an "electron quasiparticle". In an even more surprising example, the aggregate motion of electrons in the valence band of a semiconductor is the same as if the semiconductor contained instead positively charged quasiparticles called holes. Other quasiparticles or collective excitations include phonons, plasmons, and many others. These fictitious particles are typically called "quasiparticles" if they are fermions, and called "collective excitations" if they are bosons, although the precise distinction is not universally agreed.
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"quasiparticle." Definitions.net. STANDS4 LLC, 2013. Web. 9 Dec. 2013. <http://www.definitions.net/definition/quasiparticle>.