{
  "model": "Hubbard",
  "lattice": "square",
  "n_sites": 256,
  "boundary": "P",
  "params": {
    "Nf": 128,
    "U": -4
  },
  "instance_id": "Hubbard/square_256_P_128_-4",
  "rows": [
    {
      "energy": -732.289,
      "sigma": 0.028,
      "energy_variance": null,
      "dof": 256,
      "einf": -256,
      "v_score": null,
      "method": "AFQMC (Metropolis), numerically exact",
      "bound_type": "exact",
      "bound_type_reason": "exact diagonalization|ex",
      "reference": "[paper](https://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.033603) [code](https://github.com/varbench/methods/blob/main/scripts/Hubbard/square_256_P_128_-4/AFQMC/)",
      "source": "varbench@2024-10-22",
      "provenance": "imported"
    }
  ],
  "url": "https://qmbl.org/i/Hubbard/square_256_P_128_-4/",
  "per_site_divisor": 256,
  "per_site_label": "E/site",
  "record": null,
  "no_record_reason": "solved exactly"
}