1D Quantum Spin Model · Magnon Dispersion · Spin Correlations
Parameters
Mode
Observables
⟨Sz_total⟩0.00
Energy ⟨H⟩/N0.00
Magnon gap Δ0.00
Domain walls0
H = −J Σ Sᵢ·Sᵢ₊₁ − h Σ Sᵢᶻ
Magnon dispersion: ε(k) = 2J(1−cos k) + h. FM ground state (J>0, h=0): all spins aligned. AFM (J<0): Néel alternating order. Quantum fluctuations destroy long-range order in 1D (Mermin-Wagner).