J1-J2 square 8x8, J2 = 0.55

The Hamiltonian

H = ∑_⟨ij⟩ σ_i·σ_j + J₂ ∑_{⟨⟨ij⟩⟩} σ_i·σ_j

J₁ = 1, J₂ = 0.55, nearest and next-nearest neighbours, written with Pauli matrices.

lattice

square

sites

64

boundary

periodic

J2

0.55

energies

1

Stored as a total energy in the convention of VarBench; quoted here as E/N (S.S), which is what the papers report (how the conversion works).