Quantum-information analysis of electronic states of different molecular structures

G. Barcza, O. Legeza, K. H. Marti, M. Reiher

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number012508
JournalPhysical Review A
Volume83
Issue number1
DOIs
Publication statusPublished - Jan 14 2011

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information analysis
molecular structure
metal clusters
molecular orbitals
physical work
transition metals
electronics
oxygen supply equipment
molecular clusters
information theory
molecular electronics
renormalization group methods
configuration interaction
boxes
tensors
entropy
electronic structure
orbitals
copper
electrons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Quantum-information analysis of electronic states of different molecular structures. / Barcza, G.; Legeza, O.; Marti, K. H.; Reiher, M.

In: Physical Review A, Vol. 83, No. 1, 012508, 14.01.2011.

Research output: Contribution to journalArticle

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