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Incoming links: Luttinger liquid
Fermi liquid Created 2026-09-24 Updated 2026-10-18
Why can a strongly interacting liquid resemble a gas? Its low-energy excitations can be long-lived Landau quasiparticles near a Fermi surface. Normal liquid helium-3 motivates this Fermi liquid description: interactions survive in effective excitation energies and interactions.[ref]
Interacting one-dimensional fermion systems often form Luttinger liquids; non-Fermi liquids also occur in higher dimensions. A Cooper instability can produce a paired phase.[ref]
Renormalization Group Approach to Interacting Fermions by Ramamurti Shankar. Sections IV E, VI D and XI
The Fermi-surface renormalization-group scaling below organizes the low-energy interactions; zero sound tests whether their collective dynamics survives even when collisions are rare.