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A low-energy description of interacting fermions whose excitations near the Fermi surface are long-lived quasiparticles continuously connected to those of a free Fermi gas. Non-Fermi liquids lie outside this framework.
wp-physics-fermi-liquidwp-physics-quasiparticlemit-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 is an effective low-energy framework for interacting fermions near a stable Fermi surface, organized around quasiparticles and symmetry-allowed residual interactions. Systems without long-lived quasiparticles do not lie in this specialization.
A more specific theory, model, entity class, or regime is obtained by restricting or extending the scope of a broader framework.
wp-physics-effective_field_theorywp-physics-fermi-liquidmit-theory-of-solidsThis is an authored directed relation from the source endpoint to the target endpoint.
For interacting fermionic phases adiabatically connected to a Fermi gas, high-energy details are encoded in quasiparticle parameters and residual interactions near the Fermi surface. Non-Fermi-liquid phases are excluded.
The target retains the degrees of freedom and interactions relevant below a stated scale or within a stated regime, while higher-energy or unresolved degrees of freedom from the source are integrated out, coarse-grained, or encoded in effective couplings.
wp-physics-fermi-liquidwp-physics-quasiparticlemit-theory-of-solidsEach relation below starts 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-solids