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Elementary excitations VS. Quasiparticles

  1. Jul 11, 2009 #1
    "Elementary excitations" VS. "Quasiparticles"

    What's the difference between "Elementary exitations" and "Quasiparticle"?

    Thanks!
     
  2. jcsd
  3. Jul 11, 2009 #2
    Re: "Elementary excitations" VS. "Quasiparticles"

    They are essentially the same things.

    A quasi-particle is an entity to obey a particle-like equation. For example, the center of inertia R and the relative distance r between two particles obey particle-like equations but with non-particle masses: Mtot and µ (=m_reduced).

    Elementary excitations are also simple "particle-like" entities used to describe the internal degrees of freedom (like r).
     
    Last edited: Jul 11, 2009
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