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All instances / Heisenberg

Heisenberg triangular 18x18

Record

-0.551703(1) E/N (S.S)

ViT (spatial attention, b = 3, translations + C6v projection)

Viteritti et al. (2026) · lowest eligible strict variational bound (rules §6)

The Hamiltonian

H = ∑⟨ij⟩ σi·σj

Nearest-neighbour Heisenberg antiferromagnet, J = 1, written with Pauli matrices.

lattice
triangular
sites
324
boundary
periodic
energies
8

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).

Every published energy

Grouped by what the number is. Ranking happens only inside the first group.

Strict variational upper bounds (7)

Where the instance is not solved, the record is the lowest eligible energy in this group; where it is, the lowest eligible energy here is the best variational bound and the closest challenger to the exact one.

E/N (S.S)σVar(E)V-score methodsourceyear
-0.551703record 1.0e-6 n/a n/a ViT (spatial attention, b = 3, translations + C6v projection)
preprint
Viteritti et al. (2026) 2026
-0.54861 6.8e-5 7.84e+1 5.0e-2 2D RNN (iterative retraining, s = 4.0, r = 0.158)
preprint
Moss et al. (2025) 2025
-0.54716 3.0e-5 n/a n/a VMC (RVB)
quoted from another paper peer reviewed
arXiv:0902.2338, quoted in Viteritti et al. (2026) 2009
-0.5459 1.0e-4 n/a n/a EPS (16-site plaquettes)
peer reviewed
arXiv:1006.4480 2010
-0.54542 1.0e-5 n/a n/a VMC (120° order, π-flux hopping)
peer reviewed
arXiv:1512.03356 2016
-0.53570 1.0e-5 n/a n/a VMC (projected BCS + spin Jastrow)
quoted from another paper peer reviewed
Yunoki & Sorella (2006), quoted in Viteritti et al. (2026) 2006
-0.53565 2.0e-5 n/a n/a VMC (U(1) Dirac spin liquid)
peer reviewed
arXiv:1512.03356 2016

Extrapolations (1)

Zero-variance, bond-dimension or Trotter-error extrapolations. Not a bound: no ansatz ever reached the number, so it cannot hold the record.

E/N (S.S)σVar(E)V-score methodsourceyear
-0.55200 1.0e-5 n/a n/a ViT (spatial attention, b = 3, variance → 0)
preprint
Viteritti et al. (2026) 2026

How these numbers were read

Rows added after the VarBench import record where the number came from.

-0.55200(1) — ViT (spatial attention, b = 3, variance → 0)

Checked 2026-09-28 · source text of arXiv:2602.02665 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading, parsed from the committed HTML table and matched against the PDF text

Reported as. -0.55200(1)

Table 1, 18 × 18 block, row 'Zero Variance', printed '-0.55200(1)', 'This work'; caption: 'For each system size the zero-variance extrapolated energy is also reported'. Sec. V.3 / Fig. 6: linear fit of energy against variance per site over the unprojected, translation-projected and fully projected ViT states at this L; an extrapolation of the same runs, not a separate calculation. | Table 1 prints ground-state energies per site of the spin-1/2 triangular Heisenberg model on periodic L x L clusters (Sec. III: 'All calculations are performed on periodic L x L clusters with L chosen as a multiple of 3', H = J sum S_i.S_j), S.S units. Magnitude check: the values lie between -0.5517 and -0.5520, next to the 12 x 12 value -0.55315 (GCNN, per site, S.S) on Heisenberg/triangular_144_P, not four times it (Pauli) or a total.

-0.551703(1) — ViT (spatial attention, b = 3, translations + C6v...

Checked 2026-09-28 · source text of arXiv:2602.02665 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading, parsed from the committed HTML table and matched against the PDF text

Reported as. -0.551703(1)

Table 1, 18 × 18 block, row 'ViT', printed '-0.551703(1)', 'This work'; caption: 'The results of this work are obtained by enforcing translational and C6v point-group symmetries (refer to Section V.2)'. | Table 1 prints ground-state energies per site of the spin-1/2 triangular Heisenberg model on periodic L x L clusters (Sec. III: 'All calculations are performed on periodic L x L clusters with L chosen as a multiple of 3', H = J sum S_i.S_j), S.S units. Magnitude check: the values lie between -0.5517 and -0.5520, next to the 12 x 12 value -0.55315 (GCNN, per site, S.S) on Heisenberg/triangular_144_P, not four times it (Pauli) or a total.

-0.54861(7) — 2D RNN (iterative retraining, s = 4.0, r = 0.158)

Checked 2026-09-28 · authors' data release read locally (pickle via numpy), values copied by key, no transcription; the file is committed as sources/2505.20406-repo-final_energies_data.json and reproduces Table V's L = 6 energy and Table II's V-scores

Reported as. -0.5486121942967545 +/- 0.0000683154952622206 per site (S.S), Var(E/N) = 0.00004667006892922484, V-score 0.05024033645606475

github.com/mschuylermoss/HeisenbergRNN, commit 5f5cffa5cb (2025-10-28, HEAD; file last changed in d58a945cd4 2025-05-27, 'final plotting data and plotting notebooks'), Triangular/final_plotting/plotting_data/final_energies_data_plotting.pkl, sha256 bdc59e5bc3780fb4ea7444400dc9abd9984a6a259ab03f9299c1f80edb87d276: ['TriangularMS,periodicBC']['scale=4.0,rate=0.158,T=1.00'], L = 18. The paper's most accurate schedule (Table II, whose L = 18 V-score 5.0e-2 is this run's 0.0502); plotted in Fig. 4(a), not printed; quoted as -0.54861(1) in Table 1 of arXiv:2602.02665, whose error bar is not the primary's. TriangularMS is the 120-degree basis rotation U_tri, which changes the representation, not the Hamiltonian. Variance is Var(H)/N^2 in S.S units; total = var x N^2 x 16.

-0.54716(3) — VMC (RVB)

Checked 2026-09-28 · source text of arXiv:2602.02665 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading of the quotes; primary read, value not located

Reported as. −0.54716(3)

Table 1 of arXiv:2602.02665, 18 × 18 block, row 'RVB', printed '−0.54716(3)' [73]; the same string is Table II of arXiv:1512.03356 (L569), column 'E/J' (Ref. 35)', J/J' = 1.0, 'on the 18 × 18 cluster' (Becca co-authored both). Not located in the committed text of arXiv:0902.2338 (searched '547', 'Table'; its finite-size energies appear as Fig. 3 points; the text prints -0.5470(1) as the L -> infinity value). | Table 1 of arXiv:2602.02665 prints energies per site of the triangular Heisenberg model on periodic L x L clusters, S.S units.

-0.5459(1) — EPS (16-site plaquettes)

Checked 2026-09-28 · source text of arXiv:1006.4480 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading by a reader agent, line checked in the committed text by the session

Reported as. -0.5459(1)

Table 2 (sources/1006.4480.txt L252-259), row N = 324; 'N plaquettes comprising 16 sites have been employed'. Quoted as 'EPS -0.5459(1) [72]' in Table 1 of arXiv:2602.02665. | Table 2: 'Variational GS energy per site (in units of Jxy) ... for the spin-1/2 AHM on a triangular lattice of size N with PBC' at the Heisenberg point Jxy = Jz = 1, S.S units; N = 324 is the 18 x 18 cluster and N = 144 the 12 x 12. Its N = 36 value -0.55420(5) is already carried on Heisenberg/triangular_36_P as a secondary row and is left to qmbl-verify.

-0.54542(1) — VMC (120° order, π-flux hopping)

Checked 2026-09-28 · source text of arXiv:1512.03356 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading by a reader agent, line checked in the committed text by the session

Reported as. -0.54542(1)

Table I (sources/1512.03356.txt L366-377), row J'/J = 1.0, column 'E/J (Magnetic state)'; repeated in Table II at J/J' = 1.0. At the isotropic point the best magnetic state has 120° order (text, L336-340) with π-fluxes threading up triangles. Quoted as 'Jastrow-Gutzwiller -0.54542(1) [71]' in Table 1 of arXiv:2602.02665. | Table I: E/J on the 18 x 18 cluster, periodic boundary conditions (Sec. II), H = J sum S_i.S_j + J' sum S_i.S_j; row J'/J = 1.0 is the isotropic triangular Heisenberg model, S.S units.

-0.53570(1) — VMC (projected BCS + spin Jastrow)

Checked 2026-09-28 · source text of arXiv:2602.02665 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading of the quotes; primary not read

Reported as. −0.53570(1)

Table 1 of arXiv:2602.02665, 18 × 18 block, row 'p-BCS', printed '−0.53570(1)' [70]; the same string is Table II of arXiv:1512.03356 (L569), column 'E/J' (Ref. 33)', J/J' = 1.0, 'on the 18 × 18 cluster'. Primary not read: arxiv.org/pdf/cond-mat/0602180 returned HTTP 500 on 2026-09-28, so no committed text; a reader saw '-0.5357 ± 0.0001' in the primary's Table 2 on the arXiv HTML render, not committed and not used here. | Table 1 of arXiv:2602.02665 prints energies per site of the triangular Heisenberg model on periodic L x L clusters, S.S units.

-0.53565(2) — VMC (U(1) Dirac spin liquid)

Checked 2026-09-28 · source text of arXiv:1512.03356 read locally (arXiv HTML or pypdf layout text); value copied from the harvested cell and the text, no LLM transcription of numbers; single reading by a reader agent, line checked in the committed text by the session

Reported as. -0.53565(2)

Table I (sources/1512.03356.txt L366-377), row J'/J = 1.0, column 'E/J (Spin liquid)', the paper's best spin liquid; for J'/J >~ 0.85 that is the U(1) Dirac state (text L283-286: the Z2Ad Ansatz is lower only for J'/J <~ 0.85). | Table I: E/J on the 18 x 18 cluster, periodic boundary conditions (Sec. II), H = J sum S_i.S_j + J' sum S_i.S_j; row J'/J = 1.0 is the isotropic triangular Heisenberg model, S.S units.

Coverage

Newest published number here: 2026. 8 rows added from the 2026-09 literature sweep, on top of the VarBench snapshot of 2024-10-22.

This instance as data

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