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Title: Time-dependent N-electron valence perturbation theory with matrix product state reference wavefunctions for large active spaces and basis sets: Applications to the chromium dimer and all-trans polyenes

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4986975· OSTI ID:1474039

In earlier work [A. Y. Sokolov and G. K.-L. Chan, J. Chem. Phys. 144, 064102 (2016)], we introduced a time-dependent formulation of the second-order N-electron valence perturbation theory (t-NEVPT2) which (i) had a lower computational scaling than the usual internally contracted perturbation formulation and (ii) yielded the fully uncontracted NEVPT2 energy. We present a combination of t-NEVPT2 with a matrix product state (MPS) reference wavefunction (t-MPS-NEVPT2) that allows us to compute uncontracted dynamic correlation energies for large active spaces and basis sets, using the time-dependent density matrix renormalization group algorithm. In addition, we report a low-scaling MPS-based implementation of strongly contracted NEVPT2 (sc-MPS-NEVPT2) that avoids computation of the four-particle reduced density matrix. We use these new methods to compute the dissociation energy of the chromium dimer and to study the low-lying excited states in all-trans polyenes (C4H6 to C24H26), incorporating dynamic correlation for reference wavefunctions with up to 24 active electrons and orbitals

Research Organization:
Princeton Univ., NJ (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Contributing Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Grant/Contract Number:
SC0008624; SC0010530; AC02-05CH11231
OSTI ID:
1474039
Alternate ID(s):
OSTI ID: 1365432
Journal Information:
Journal of Chemical Physics, Vol. 146, Issue 24; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Driven similarity renormalization group for excited states: A state-averaged perturbation theory journal March 2018
Reduced scaling CASPT2 using supporting subspaces and tensor hyper-contraction journal July 2018
Multi-reference algebraic diagrammatic construction theory for excited states: General formulation and first-order implementation journal November 2018
Downfolding of many-body Hamiltonians using active-space models: Extension of the sub-system embedding sub-algebras approach to unitary coupled cluster formalisms journal July 2019
Evaluation of full valence correlation energies and gradients journal June 2019
Multireference configuration interaction and perturbation theory without reduced density matrices journal December 2019
The density matrix renormalization group in chemistry and molecular physics: Recent developments and new challenges journal January 2020
Multireference configuration interaction and perturbation theory without reduced density matrices text January 2019