We present an embedded fragment approach for high-level quantum chemical calculations on local features in periodic systems. The fragment is defined as a set of localized orbitals (occupied and virtual) corresponding to a converged periodic Hartree–Fock solution. These orbitals serve as the basis for the in-fragment post-Hartree–Fock treatment. The embedding field for the fragment, consisting of the Coulomb and exchange potential from the rest of the crystal, is included in the fragment’s one-electron Hamiltonian. As an application of the embedded fragment approach, we investigate the performance of full configuration interaction quantum Monte Carlo (FCIQMC) with the adaptive shift. As the orbital choice, we use the natural orbitals from the distinguishable cluster method with singles and doubles. FCIQMC is a stochastic approximation to the full CI method and can be routinely applied to much larger active spaces than the latter. This makes this method especially attractive in the context of open shell defects in crystals, where fragments of adequate size can be rather large. As a test case, we consider dissociation of a fluorine atom from a fluorographane surface. This process poses a challenge for high-level electronic structure models as both the static and dynamic correlations are essential here. Furthermore, the active space for an adequate fragment (32 electrons in 173 orbitals) is already quite large even for FCIQMC. Despite this, FCIQMC delivers accurate dissociation and total energies.
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21 April 2022
Research Article|
April 18 2022
Full configuration interaction quantum Monte Carlo treatment of fragments embedded in a periodic mean field
Special Collection:
Beyond GGA Total Energies for Solids and Surfaces
Evelin Martine Corvid Christlmaier
;
Evelin Martine Corvid Christlmaier
1
Institut für Chemie, Humboldt-Universität zu Berlin
, Brook-Taylor-Str. 2, D-12489 Berlin, Germany
2
Max Planck Institute for Solid State Research
, Heisenbergstraße 1, D-70569 Stuttgart, Germany
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Daniel Kats
;
Daniel Kats
2
Max Planck Institute for Solid State Research
, Heisenbergstraße 1, D-70569 Stuttgart, Germany
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Ali Alavi
;
Ali Alavi
2
Max Planck Institute for Solid State Research
, Heisenbergstraße 1, D-70569 Stuttgart, Germany
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Denis Usvyat
Denis Usvyat
a)
1
Institut für Chemie, Humboldt-Universität zu Berlin
, Brook-Taylor-Str. 2, D-12489 Berlin, Germany
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 156, 154107 (2022)
Article history
Received:
January 02 2022
Accepted:
March 27 2022
Citation
Evelin Martine Corvid Christlmaier, Daniel Kats, Ali Alavi, Denis Usvyat; Full configuration interaction quantum Monte Carlo treatment of fragments embedded in a periodic mean field. J. Chem. Phys. 21 April 2022; 156 (15): 154107. https://doi.org/10.1063/5.0084040
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