CONTROL PARAMETER
FERROMAGNETIC
OBSERVABLES
Magnetization ⟨σˣ⟩:—
Ground energy E₀:—
Energy gap Δ:—
Entanglement S:—
Correlation ⟨σᵢσⱼ⟩:—
PHYSICS
H = −J∑σᵢᶻσⱼᶻ − h∑σᵢˣ
Critical point: J/h = 1
Universality: d=1 Ising CFT
Central charge c = 1/2
ν = 1, β = 1/8 (exponents)