We introduce a new implementation of the coupled cluster method with single and double excitations tailored by the matrix product state wave functions (DMRG-TCCSD), which employs the local pair natural orbital (LPNO) approach. By exploiting locality in the coupled cluster stage of the calculation, we were able to remove some of the limitations that hindered the application of the canonical version of the method to larger systems and/or with larger basis sets. We assessed the accuracy of the approximation using two systems: tetramethyleneethane (TME) and oxo-Mn(Salen). Using the default cut-off parameters, we were able to recover over 99.7% and 99.8% of the canonical correlation energy for the triplet and singlet state of TME, respectively. In the case of oxo-Mn(Salen), we found that the amount of retrieved canonical correlation energy depends on the size of the complete active space (CAS)—we retrieved over 99.6% for the larger 27 orbital CAS and over 99.8% for the smaller 22 orbital CAS. The use of LPNO-TCCSD allowed us to perform these calculations up to quadruple-ζ basis set, amounting to 1178 basis functions. Moreover, we examined dependence of the ground state of oxo-Mn(Salen) on the CAS composition. We found that the inclusion of 4dxy orbital plays an important role in stabilizing the singlet state at the DMRG-CASSCF level via double-shell effect. However, by including dynamic correlation, the ground state was found to be triplet regardless of the size of the basis set or the composition of CAS, which is in agreement with previous findings by canonical DMRG-TCCSD in smaller basis.
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28 August 2019
Research Article|
August 30 2019
Toward the efficient local tailored coupled cluster approximation and the peculiar case of oxo-Mn(Salen)
Andrej Antalík
;
Andrej Antalík
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
2
Faculty of Mathematics and Physics, Charles University
, Ke Karlovu 3, 12116 Prague 2, Czech Republic
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Libor Veis
;
Libor Veis
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
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Jiří Brabec
;
Jiří Brabec
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
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Ondřej Demel;
Ondřej Demel
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
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Örs Legeza;
Örs Legeza
3
Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics
, H-1525 Budapest, Hungary
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Jiří Pittner
Jiří Pittner
a)
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
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Andrej Antalík
1,2
Libor Veis
1
Jiří Brabec
1
Ondřej Demel
1
Örs Legeza
3
Jiří Pittner
1,a)
1
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic
, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
2
Faculty of Mathematics and Physics, Charles University
, Ke Karlovu 3, 12116 Prague 2, Czech Republic
3
Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics
, H-1525 Budapest, Hungary
a)
Electronic mail: [email protected]
J. Chem. Phys. 151, 084112 (2019)
Article history
Received:
May 17 2019
Accepted:
July 29 2019
Citation
Andrej Antalík, Libor Veis, Jiří Brabec, Ondřej Demel, Örs Legeza, Jiří Pittner; Toward the efficient local tailored coupled cluster approximation and the peculiar case of oxo-Mn(Salen). J. Chem. Phys. 28 August 2019; 151 (8): 084112. https://doi.org/10.1063/1.5110477
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