Optimised projections for the ab initio simulation of large and strongly correlated systems
Density functional theory (DFT) has become the standard workhorse for quantum mechanical simulations as it offers a good compromise between accuracy and computational cost. However, there are many important systems for which DFT performs very poorly, most notably strongly-correlated materials, resul...
محفوظ في:
| المؤلف الرئيسي: | |
|---|---|
| التنسيق: | Thèse numérique |
| اللغة: | Anglais |
| منشور في: |
Berlin, Heidelberg :
Springer Berlin Heidelberg
2012.
Cham : Springer Nature |
| سلاسل: | Springer Theses, Recognizing Outstanding Ph.D. Research
|
| الموضوعات: | |
| الوصول للمادة أونلاين: | Accès sur la plateforme de l'éditeur Accès sur la plateforme Istex Accès Université d'Orléans Accès INSA CVL |
| ملاحظة: |
Archives Springer e-books (Licence nationale) Archives Springer e-books (Licence nationale) |
| Autres localisations: | Voir dans le Sudoc |
| Edition sous un autre format: | • Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems, Texte imprimé, 9783642232374 • Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems, Texte imprimé, 9783642232398 • Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems, Texte imprimé, 9783642269738 |
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| 008 | 140325s2012 xx ||| |||| 00| 0 eng d | ||
| 009 | PPN177154969 | ||
| 020 | |a 9783642232381 | ||
| 041 | 0 | |a eng | |
| 082 | |a 530.41 | ||
| 100 | 1 | |a O'Regan, David D. | |
| 245 | 1 | 0 | |a Optimised projections for the ab initio simulation of large and strongly correlated systems |c David D. O'Regan. |
| 260 | |a Berlin, Heidelberg : |b Springer Berlin Heidelberg. | ||
| 260 | |a Cham : |b Springer Nature, |c 2012. | ||
| 490 | 0 | |a Springer Theses, Recognizing Outstanding Ph.D. Research |x 2190-5061 | |
| 500 | |a Archives Springer e-books (Licence nationale) | ||
| 500 | |a Archives Springer e-books (Licence nationale) | ||
| 502 | |a Thèse de doctorat, physique, université de Cambridge, Royaume-Uni, 2011 | ||
| 505 | 0 | |a An Introduction to Linear-Scaling Ab Initio Calculations -- Linear-Scaling DFT+U for Large Strongly-Correlated Systems.- Projector Self-Consistent DFT+U Using Nonorthogonal Generalised Wannier Functions.-Linear-Scaling Ab Initio Calculations.-Linear-Scaling DFT+U for Large Strongly Correlated Systems.- Optimised Projections for Strongly-Correlated Subspaces -- Projector Self-Consistent DFT +U Using Nonorthogonal Generalised Wannier Functions -- Subspace Representations in Ab Initio Methods for Strongly Correlated Systems -- Tensorial Consequences of Projection Optimisation -- Geometric Aspects of Representation Optimisation.- A Numerical Study of Geometric Corrections for Representation Optimisation -- Tensorial Aspects of Calculating Hubbard U Interaction Parameters -- Discussion and Conclusion -- Appendix: Geometric Observations. | |
| 506 | |a Accès en ligne pour les établissements français bénéficiaires des licences nationales | ||
| 506 | |a Accès soumis à abonnement pour tout autre établissement | ||
| 506 | |a Conditions particulières de réutilisation pour les bénéficiaires des licences nationales. chttps://www.licencesnationales.fr/springer-nature-ebooks-contrat-licence-ln-2017 | ||
| 520 | |a Density functional theory (DFT) has become the standard workhorse for quantum mechanical simulations as it offers a good compromise between accuracy and computational cost. However, there are many important systems for which DFT performs very poorly, most notably strongly-correlated materials, resulting in a significant recent growth in interest in 'beyond DFT' methods. The widely used DFT+U technique, in particular, involves the addition of explicit Coulomb repulsion terms to reproduce the physics of spatially-localised electronic subspaces. The magnitude of these corrective terms, measured by the famous Hubbard U parameter, has received much attention but less so for the projections used to delineate these subspaces. The dependence on the choice of these projections is studied in detail here and a method to overcome this ambiguity in DFT+U, by self-consistently determining the projections, is introduced. The author shows how nonorthogonal representations for electronic states may be used to construct these projections and, furthermore, how DFT+U may be implemented with a linearly increasing cost with respect to system size. The use of nonorthogonal functions in the context of electronic structure calculations is extensively discussed and clarified, with new interpretations and results, and, on this topic, this work may serve as a reference for future workers in the field. | ||
| 650 | |a Théorie de la fonctionnelle de densité | ||
| 650 | |a Problème des N corps | ||
| 776 | 0 | |t Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems |b Texte imprimé |z 9783642232374 | |
| 776 | 0 | |t Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems |b Texte imprimé |z 9783642232398 | |
| 776 | 0 | |t Optimised Projections for the Ab Initio Simulation of Large and Strongly Correlated Systems |b Texte imprimé |z 9783642269738 | |
| 856 | 4 | |q PDF |u https://doi.org/10.1007/978-3-642-23238-1 |z Accès sur la plateforme de l'éditeur | |
| 856 | 4 | |u https://revue-sommaire.istex.fr/ark:/67375/8Q1-QW8Z3LN3-5 |z Accès sur la plateforme Istex | |
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