Charge-neutral spinon quasiparticles, gauge fluctuations, and thermal transport without charge
In a U(1) quantum spin liquid, spins fractionalize into charge-neutral spinons that form a Fermi surface coupled to an emergent U(1) gauge field. Unlike metals, κ/T (thermal conductivity) is finite while σ=0 (no charge transport). Gauge fluctuations scatter spinons, giving a Wilson ratio W=2 and non-Fermi-liquid specific heat γ(T) ∝ T^(2/3) corrections at low T.