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The Green function variational approximation : significance of physical constraints
We present a calculation of the spectral properties of a single charge doped at a Cu(3d) site of the Cu-F plane in KCuF_{3}. The problem is treated by generating the equations of motion for the Green function by means of subsequent Dyson expansions and solving the resulting set of equations. This method, dubbed the variational approximation, is both very dependable and flexible, since it is a systematic expansion with precise control over elementary physical processes. It allows for deep insight into the underlying physics of polaron formation as well as for inclusion of many physical constraints, such as excluding crossing diagrams and double occupation constraint, which are not included in the self-consistent Born approximation. Here we examine the role and importance of such constraints by analyzing various spectral functions obtained in second order variational approximation.
cris.lastimport.scopus | 2024-04-07T15:48:04Z | |
dc.abstract.en | We present a calculation of the spectral properties of a single charge doped at a Cu(3d) site of the Cu-F plane in KCuF_{3}. The problem is treated by generating the equations of motion for the Green function by means of subsequent Dyson expansions and solving the resulting set of equations. This method, dubbed the variational approximation, is both very dependable and flexible, since it is a systematic expansion with precise control over elementary physical processes. It allows for deep insight into the underlying physics of polaron formation as well as for inclusion of many physical constraints, such as excluding crossing diagrams and double occupation constraint, which are not included in the self-consistent Born approximation. Here we examine the role and importance of such constraints by analyzing various spectral functions obtained in second order variational approximation. | pl |
dc.affiliation | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego | pl |
dc.contributor.author | Bieniasz, Krzysztof - 115151 | pl |
dc.contributor.author | Berciu, M. | pl |
dc.contributor.author | Oleś, Andrzej - 100024 | pl |
dc.date.accessioned | 2016-12-21T12:58:33Z | |
dc.date.available | 2016-12-21T12:58:33Z | |
dc.date.issued | 2016 | pl |
dc.date.openaccess | 0 | |
dc.description.accesstime | w momencie opublikowania | |
dc.description.number | 2 | pl |
dc.description.physical | 659-662 | pl |
dc.description.version | ostateczna wersja wydawcy | |
dc.description.volume | 130 | pl |
dc.identifier.doi | 10.12693/APhysPolA.130.659 | pl |
dc.identifier.eissn | 1898-794X | pl |
dc.identifier.issn | 0587-4246 | pl |
dc.identifier.project | ROD UJ / P | pl |
dc.identifier.uri | http://ruj.uj.edu.pl/xmlui/handle/item/34418 | |
dc.language | eng | pl |
dc.language.container | eng | pl |
dc.rights | Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Bez utworów zależnych 4.0 Międzynarodowa | * |
dc.rights.licence | OTHER | |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.pl | * |
dc.share.type | otwarte czasopismo | |
dc.subtype | Article | pl |
dc.title | The Green function variational approximation : significance of physical constraints | pl |
dc.title.journal | Acta Physica Polonica. A | pl |
dc.title.volume | Proceedings of the XVII National Conference on Superconductivity Karpacz, Poland, October 25-30, 2015, "Superconductivity and other emergent states in systems with strongly correlated electrons" | pl |
dc.type | JournalArticle | pl |
dspace.entity.type | Publication |
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