Towards DMRG-tailored coupled cluster method in the 4c-relativistic domain

Abstract

There are three essential problems in computational relativistic chemistry: electrons moving at relativistic speeds, close lying states and dynamical correlation. Currently available quantum-chemical methods are capable of solving systems with one or two of these issues. However, there is a significant class of molecules, in which all the three effects are present. These are the heavier transition metal compounds, lanthanides and actinides with open d or f shells. For such systems, sufficiently accurate numerical methods are not available, which hinders the application of theoretical chemistry in this field. In this paper, we combine two numerical methods in order to address this challenging class of molecules. These are the relativistic versions of coupled cluster methods and density matrix renormalization group (DMRG) method. To the best of our knowledge, this is the first relativistic implementation of the coupled cluster method externally corrected by DMRG. The method brings a significant reduction of computational costs, as we demonstrate on the system of TlH, AsH and SbH.

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Cited by in corpus (6)

• A General Automatic Method for Optimal Construction of Matrix Product Operators Using Bipartite Graph Theory
• SOiCI and iCISO: Combining iterative configuration interaction with spin-orbit coupling in two ways
• Renormalized Internally-Contracted Multireference Coupled Cluster with Perturbative Triples
• Complete Active Space Iterative Coupled Cluster Theory
• Hilbert space multireference coupled clusters tailored by matrix product states
• DMRG-tailored coupled cluster method in the 4c-relativistic domain: General implementation and application to the NUHFI and NUF${}_3$ molecules