Combining the in-medium similarity renormalization group with the density 
matrix renormalization group: Shell structure and information entropy

Tichai, A.; Knecht, S.; Kruppa, A.T.; Legeza, Ö.; Moca, C.P.; Schwenk, A.; Werner, M.A.; Zarand, G.

doi:10.1016/j.physletb.2023.138139

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Combining the in-medium similarity renormalization group with the density matrix renormalization group: Shell structure and information entropy

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Tichai, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwenk, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://www.sciencedirect.com/science/article/pii/S0370269323004732?pes=vor
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Citation

Tichai, A., Knecht, S., Kruppa, A., Legeza, Ö., Moca, C., Schwenk, A., et al. (2023). Combining the in-medium similarity renormalization group with the density matrix renormalization group: Shell structure and information entropy. Physics Letters B, 845: 138139. doi: 10.1016/j.physletb.2023.138139.

Cite as: https://hdl.handle.net/21.11116/0000-000D-C101-7

Abstract

We propose a novel many-body framework combining the density matrix renormalization group (DMRG) with the valence-space (VS) formulation of the in-medium similarity renormalization group. This hybrid scheme admits for favorable computational scaling in large-space calculations compared to direct diagonalization. The capacity of the VS-DMRG approach is highlighted in ab initio calculations of neutron-rich nickel isotopes based on chiral two- and three-nucleon interactions, and allows us to perform converged ab initio computations of ground and excited state energies. We also study orbital entanglement in the VS-DMRG, and investigate nuclear correlation effects in oxygen, neon, and magnesium isotopes. The explored entanglement measures reveal nuclear shell closures as well as pairing correlations.