Regional self-interaction correction of density functional theory |
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Authors: | Tsuneda Takao Kamiya Muneaki Hirao Kimihiko |
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Institution: | Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan. tune@qcl.t.u-tokyo.ac.jp |
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Abstract: | We propose a new simple scheme for self-interaction correction (SIC) of exchange functionals in the density functional theory. In the new scheme, exchange energies are corrected by substituting exchange self-interactions for exchange functionals in regions of self-interaction. To classify the regions of self-interaction, we take advantage of the property of the total kinetic energy density approaching the Weizs?cker density in the case of electrons in isolated orbitals. The scheme differs from conventional SIC methods in that it produces optimized molecular structures. Applying the scheme to the calculation of reaction energy barriers showed that it provides a clear improvement in cases where the barriers are underestimated by conventional "pure" functionals. In particular, we found that this scheme even reproduces a transition state that is not given by pure functionals. |
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Keywords: | density functional theory self‐interaction correction exchange functional reaction barrier energies kinetic energy density |
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