We describe the joint application of the density matrix renormalization group and canonical transformation theory to multireference quantum chemistry. The density matrix renormalization group provides the ability to describe static correlation in large active spaces, while the canonical transformation theory provides a high-order description of the dynamic correlation effects. We demonstrate the joint theory in two benchmark systems designed to test the dynamic and static correlation capabilities of the methods, namely, (i) total correlation energies in long polyenes and (ii) the isomerization curve of the core. The largest complete active spaces and atomic orbital basis sets treated by the joint DMRG-CT theory in these systems correspond to a active space and 268 atomic orbitals in the polyenes and a active space and 278 atomic orbitals in .
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14 January 2010
Research Article|
January 13 2010
Multireference quantum chemistry through a joint density matrix renormalization group and canonical transformation theory
Takeshi Yanai;
Takeshi Yanai
1
Institute for Molecular Science
, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
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Yuki Kurashige;
Yuki Kurashige
1
Institute for Molecular Science
, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
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Eric Neuscamman;
Eric Neuscamman
2Department of Chemistry and Chemical Biology,
Cornell University
, Ithaca, New York 14853-1301, USA
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Garnet Kin-Lic Chan
Garnet Kin-Lic Chan
a)
2Department of Chemistry and Chemical Biology,
Cornell University
, Ithaca, New York 14853-1301, USA
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a)
Electronic mail: [email protected].
J. Chem. Phys. 132, 024105 (2010)
Article history
Received:
October 03 2009
Accepted:
November 30 2009
Connected Content
A companion article has been published:
Strongly contracted canonical transformation theory
Citation
Takeshi Yanai, Yuki Kurashige, Eric Neuscamman, Garnet Kin-Lic Chan; Multireference quantum chemistry through a joint density matrix renormalization group and canonical transformation theory. J. Chem. Phys. 14 January 2010; 132 (2): 024105. https://doi.org/10.1063/1.3275806
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