xxz_triangular_19.yaml

basis:
  number_spins: 19
  symmetries: []
hamiltonian:
  name: "Heisenberg Hamiltonian"
  terms:
    - matrix: [[0.25,  0,  0,  0],
               [0, -0.25,  0.3535,  0],
               [0,  0.3535, -0.25,  0],
               [0,  0,  0,  0.25]]
      sites: [[0, 1], [0, 4], [0, 3],
              [1, 2], [1, 5], [1, 4],
              [2, 7], [2, 6], [2, 5],
              [3, 4], [3, 8], [3, 7],
              [4, 5], [4, 9], [4, 8],
              [5, 6], [5, 10], [5, 9],
              [6, 12], [6, 11], [6, 10],
              [7, 8], [7, 12], [7, 6],
              [8, 9], [8, 13], [8, 12],
              [9, 10], [9, 14], [9, 13],
              [10, 11], [10, 15], [10, 14],
              [11, 16], [11, 0], [11, 15],
              [12, 13], [12, 16], [12, 11],
              [13, 14], [13, 17], [13, 16],
              [14, 15], [14, 18], [14, 17],
              [15, 0], [15, 3], [15, 18],
              [16, 17], [16, 1], [16, 0],
              [17, 18], [17, 2], [17, 1],
              [18, 3], [18, 7], [18, 2]]
    - matrix: [[-0.5, 0], [0, 0.5]]
      # z 0.5  1.5  5
      # a  
      sites: [[0], [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18]]
observables:
  - name: "Sz"
    terms:
      - matrix: [[0.5, 0],
               [0, -0.5]]
        sites: [[0],[1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18]]
number_vectors: 6
max_primme_block_size: 6
precision: 1.0e-6