 All-to-all Heisenberg model

ID: all-to-all-heisenberg-model

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.

 New to topics? Read the docs here!