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DMRG

General

ACTIVE

Active space orbitals for DMRGSCF, per irrep. Same conventions as for other MR methods.

  • Type: array
  • Default: No Default

DMRG_ACTIVE_SPACE

Which active space to use for DMRGSCF calculations: –> input with SCF rotations (INPUT); –> natural orbitals (NO); –> localized and ordered orbitals (LOC)

  • Type: string
  • Possible Values: INPUT, NO, LOC
  • Default: INPUT

DMRG_AVG_STATES

Whether or not to use state-averaging for roots >=2 with DMRG-SCF.

DMRG_CHKPT

Whether or not to create intermediary MPS checkpoints

DMRG_DIIS_BRANCH

When the update norm is smaller than this value DIIS starts.

  • Type: double
  • Default: 1e-2

DMRG_DO_DIIS

Whether or not to use DIIS for DMRGSCF.

DMRG_E_CONVERGENCE

The energy convergence to stop an instruction during successive DMRG instructions

  • Type: array
  • Default: No Default

DMRG_LOC_RANDOM

Whether to start the active space localization process from a random unitary or the unit matrix.

DMRG_MAXITER

Maximum number of DMRGSCF iterations

  • Type: integer
  • Default: 100

DMRG_MAXSWEEPS

The maximum number of sweeps to stop an instruction during successive DMRG instructions

  • Type: array
  • Default: No Default

DMRG_NOISEPREFACTORS

The noiseprefactors for successive DMRG instructions

  • Type: array
  • Default: No Default

DMRG_PRINT_CORR

Whether or not to print the correlation functions after the DMRG calculation

DMRG_STATES

The number of reduced renormalized basis states to be retained during successive DMRG instructions

  • Type: array
  • Default: No Default

DMRG_STORE_DIIS

Whether or not to store the DIIS checkpoint on disk (convenient for restarting).

DMRG_STORE_UNIT

Whether or not to store the unitary on disk (convenient for restarting).

DMRG_WFN_IRREP

The DMRG wavefunction irrep uses the same conventions as PSI4. How convenient :-). Just to avoid confusion, it’s copied here. It can also be found on http://sebwouters.github.io/CheMPS2/classCheMPS2_1_1Irreps.html . Symmetry Conventions Irrep Number & Name Group Number & Name 0 1 2 3 4 5 6 7 0: c1 A 1: ci Ag Au 2: c2 A B 3: cs A’ A’’ 4: d2 A B1 B2 B3 5: c2v A1 A2 B1 B2 6: c2h Ag Bg Au Bu 7: d2h Ag B1g B2g B3g Au B1u B2u B3u

  • Type: integer
  • Default: -1

DMRG_WFN_MULTP

The DMRG wavefunction multiplicity in the form (2S+1)

  • Type: integer
  • Default: -1

DMRG_WHICH_ROOT

Which root is targeted: 1 means ground state, 2 first excited state, etc.

  • Type: integer
  • Default: 1

D_CONVERGENCE

Convergence threshold for the gradient norm.

FROZEN_DOCC

Doubly occupied frozen orbitals for DMRGSCF, per irrep. Same conventions as for other MR methods

  • Type: array
  • Default: No Default