Block product density matrix embedding theory for strongly correlated spin systems
| العنوان: | Block product density matrix embedding theory for strongly correlated spin systems |
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| المؤلفون: | Sebastian Wouters, Klaas Gunst, Stijn De Baerdemacker, Dimitri Van Neck |
| المصدر: | PHYSICAL REVIEW B |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Density matrix, DIMENSIONS, FOS: Physical sciences, 01 natural sciences, LIMIT, Condensed Matter - Strongly Correlated Electrons, QUANTUM RENORMALIZATION-GROUPS, CHEMISTRY, Lattice (order), 0103 physical sciences, Tangent space, Cluster (physics), Embedding theory, Statistical physics, 010306 general physics, HEISENBERG-MODEL, ENTANGLEMENT, ANTIFERROMAGNETS, Ansatz, Physics, 010304 chemical physics, Strongly Correlated Electrons (cond-mat.str-el), Square lattice, LATTICE, Physics and Astronomy, Excited state, GROUND-STATE, Condensed Matter::Strongly Correlated Electrons |
| الوصف: | Density matrix embedding theory (DMET) is a relatively new technique for the calculation of strongly correlated systems. Recently, block product DMET (BPDMET) was introduced for the study of spin systems such as the antiferromagnetic $J_1 - J_2$ model on the square lattice. In this paper, we extend the variational Ansatz of BPDMET using spin-state optimization, yielding improved results. We apply the same techniques to the Kitaev-Heisenberg model on the honeycomb lattice, comparing the results when using several types of clusters. Energy profiles and correlation functions are investigated. A diagonalization in the tangent space of the variational approach yields information on the excited states and the corresponding spectral functions. 12 pages, 12 figures |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2469-9950 2469-9969 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9d7d883050618519dff18cb0a92e7e6 https://hdl.handle.net/1854/LU-8532327 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....e9d7d883050618519dff18cb0a92e7e6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699950 24699969 |
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