Density matrix renormalization group pair-density functional theory (DMRG-PDFT): singlet–triplet gaps in polyacenes and polyacetylenes† †Electronic supplementary information (ESI) available: Absolute energies in hartrees, timings, geometry comparison, and Cartesian coordinates. See DOI: 10.1039/c8sc

The density matrix renormalization group (DMRG) is a powerful method to treat static correlation.

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