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BSE Hamiltonian
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Started at:  Wed Oct 28 00:11:14 2026

Atoms                          : Si2
Ground state XC functional     : PBE
Valence electrons              : 8
Spinor calculations            : False
Number of bands                : 16
Number of spins                : 1
Number of k-points             : 8
Number of irreducible k-points : 3
Number of q-points             : 8
Number of irreducible q-points : 3

    q: [0.0000 0.0000 0.0000]
    q: [0.5000 0.5000 0.0000]
    q: [0.5000 0.5000 0.5000]

Response PW cutoff             : 50.0 eV
Screening bands included       : 16
Valence bands                  : [1, 2, 3]
Conduction bands               : [4, 5, 6, 7]
Tamm-Dancoff approximation     : True
Number of pair orbitals        : 96

Truncation of Coulomb kernel   : None
Coulomb integration scheme     : reciprocal

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Parallelization - Total number of CPUs   : 1
  Screened potential
    K-point/band decomposition           : 1
  Hamiltonian
    Pair orbital decomposition           : 1
Calculating BSE matrix elements at q_c = [0.0, 0.0, 0.0]
Calculating screened potential and direct kernel
  Finished IBZ q-point 1/3 (8 iterations) in 0:00:00 - Estimated 0:00:03 left
  Finished IBZ q-point 2/3 (32 iterations) in 0:00:01 - Estimated 0:00:01 left
  Finished IBZ q-point 3/3 (64 iterations) in 0:00:02 - Estimated 0:00:00 left
Calculating response function at 121 frequency points
Diagonalizing Hamiltonian
  Eliminated 0 pair orbitals
  Using lapack...

Checking f-sum rule
  Valence electrons : 8
  Frequency integral: 12.435474
  Sum of weights    : 12.441887

Calculation completed at: Wed Oct 28 00:11:16 2026

