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A long-lived excitation of an interacting many-body state that propagates approximately like a particle with renormalized properties. Quasiparticles are regime-dependent and can cease to exist when damping is too strong.
wp-physics-quasiparticlewp-physics-condensed-mattermit-theory-of-solidsEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Fermi-liquid theory describes low-energy excitations near the Fermi surface as quasiparticles whose decay rate vanishes sufficiently rapidly toward the chemical potential.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-physics-fermi-liquidwp-physics-quasiparticlemit-theory-of-solidsThis is an authored directed relation from the source endpoint to the target endpoint.
In regimes with sufficiently weak damping, poles or coherent structures in the interacting system behave as quasiparticles with renormalized properties.
The target is a collective, organizational, or scale-dependent phenomenon of the source constituents and interactions; it is not a mere list or classical sum of constituents.
wp-physics-quasiparticlewp-physics-many_body_quantum_mechanicsmit-theory-of-solidsEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
A phonon is a quasiparticle associated with a quantized lattice normal mode.
The target is a member or subtype of the broader source class.
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