 All-to-all Heisenberg model

ID: all-to-all-heisenberg-model

Codex  0 Created 2026-09-24 Updated 2026-10-03

For

N

spin-one-half systems and one term per unordered pair,

\sum_{i < j} σ_{i} \cdot σ_{j} = 2 S^{2} - \frac{3 N}{2}, S = \frac{1}{2} \sum_{i} σ_{i} .

Its minimum lies in the smallest available total-spin sector.

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