Abstract
Summarized here are the ideas of Kohn-Sham spin density functional theory for the many-electron ground state, the effects of exchange and correlation, and the limits of weak and strong correlation. In particular, the suppression of electron number fluctuations in one-electron regions due to correlation is discussed. While the standard local spin density and generalized gradient approximations (GGA’s) for the exchange-correlation energy can work for certain cases of strong correlation, they fail dramatically for others. It is suggested that the new self-correlation-free meta-GGA’s and self-interaction-free hyper-GGA’s might yield a more reliable description of strong correlation.
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Perdew, J.P. (2002). Can Density Functional Theory Describe Strongly Correlated Electronic Systems?. In: Gonis, A., Kioussis, N., Ciftan, M. (eds) Electron Correlations and Materials Properties 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-3760-8_13
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DOI: https://doi.org/10.1007/978-1-4757-3760-8_13
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