Block product density matrix embedding theory for strongly correlated spin systems
| Autor: | Sebastian Wouters, Klaas Gunst, Stijn De Baerdemacker, Dimitri Van Neck |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
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 |
| Zdroj: | PHYSICAL REVIEW B |
| ISSN: | 2469-9950 2469-9969 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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