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The seniority quantum number in Tensor Network States

by K. Gunst, D. Van Neck, P.A. Limacher and S. De Baerdemacker

Submission summary

As Contributors: Klaas Gunst
Preprint link: scipost_202008_00004v1
Code repository:
Date submitted: 2020-08-04 15:20
Submitted by: Gunst, Klaas
Submitted to: SciPost Chemistry
Academic field: Chemistry
  • Quantum Physics
  • Theoretical and Computational Chemistry
Approaches: Theoretical, Computational


We employ tensor network methods for the study of the seniority quantum number -- defined as the number of unpaired electrons in a many-body wave function -- in molecular systems. Seniority-zero methods recently emerged as promising candidates to treat strong static correlations in molecular systems, but are prone to deficiencies related to dynamical correlation and dispersion. We systematically resolve these deficiencies by increasing the allowed seniority number using tensor network methods. In particular, we investigate the number of unpaired electrons needed to correctly describe the binding of the neon and nitrogen dimer and the $D_{6h}$ symmetry of benzene.

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Submission scipost_202008_00004v1 on 4 August 2020

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