Observables
⟨E⟩/N: –
⟨|m|⟩: –
Frustrated bonds: –%
Lattice: kagome
The kagome lattice has corner-sharing triangles — every triangle is frustrated under antiferromagnetic coupling (cannot satisfy all 3 bonds). This yields a flat band at energy E=0 in the tight-binding spectrum and a macroscopic ground-state degeneracy ∝ exp(N). Real materials: herbertsmithite ZnCu₃(OH)₆Cl₂, the experimental quantum spin liquid.