Quantum-information analysis of electronic states of different molecular structures

By Gergely Barcza, Örs Legeza, Konrad H. Marti, Markus Reiher. 2010

167 citations recorded by the source corpus.

We have studied transition metal clusters from a quantum information theory perspective using the density-matrix renormalization group (DMRG) method. We demonstrate the competition between entanglement and interaction localization and discuss the application of the configuration interaction-based dynamically extended active space procedure, which significantly reduces the effective system size and accelerates the speed of convergence for complicated molecular electronic structures. Our results indicate the importance of taking entanglement among molecular orbitals into account in order to devise an optimal DMRG orbital ordering and carry out efficient calculations on transition metal clusters. Apart from these algorithmic observations, which lead to a recipe for black-box DMRG calculations, our work provides physical understanding of electron correlation in molecular and cluster structures in terms of entropy measures of relevance also to recent work on tensor-network representations of electronic states. We also identify those molecular orbitals which are highly entangled and discuss the consequences for chemical bonding and for the structural transition from an dioxygen binding copper cluster to an bis-oxygen-bridged system with broken O-O bond.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/4ec9aead756c519478d0ef1983cf6995f2eacb01

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Towards the solution of the many-electron problem in real materials: equation of state of the hydrogen chain with state-of-the-art many-body methods (2017, methodology): “The split-localized orbitals were ordered by the exchange Fiedler vector [66, 67].”
Tensor product methods and entanglement optimization for ab initio quantum chemistry (2014, unknown): “n=0, sz=0 n=1, sz=- 1 2 n=1, sz= 1 2 n=2, sz=-1 n=2, sz=0 n=2, sz=1 n=3, sz=- 1 2 n=3, sz= 1 2 n=4, sz=0 ρi,j −− − ↓ ↓− −↑ ↑− ↓ ↓ −↑↓ ↓ ↑ ↑ ↓ ↑↓− ↑ ↑ ↓ ↑↓ ↑↓ ↓ ↑ ↑↓ ↑↓ ↑ ↑↓ ↑↓ −− (1,1) − ↓ (1,6) (2,5) ↓− (5,2) (6,1) −↑ (1,11) (3,9) ↑− (9,3) (1,11) ↓ ↓ (6,6) −↑↓ (1,16) (2,15) (3,14) (4,13) ↓ ↑ (5,12)”
The density matrix renormalization group for ab initio quantum chemistry (2014, background): “– [Cu2O2] 2+ [86, 94, 95, 102] requires accurate descriptions of both static and dynamic correlation along its isomerization coordinate.”