Gespeichert in:
| Hauptverfasser: | , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2409.16762 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866909325566410752 |
|---|---|
| author | Li, Hui Su, Yingze Xiong, Junnian Lin, Haiqing Huang, Huaqing Li, Dingping |
| author_facet | Li, Hui Su, Yingze Xiong, Junnian Lin, Haiqing Huang, Huaqing Li, Dingping |
| contents | The $GW$ approximation is a widely used framework for studying correlated materials, but it struggles with certain limitations, such as its inability to explain pseudogap phenomena. To overcome these problems, we propose a systematic theoretical framework for Green's function corrections and apply it specifically to the $GW$ approximation. In this new theory, the screened potential is reconnected to the physical response function, i.e. the covariant response function proposed in \cite{cGW_2023}, rather than using the RPA formula. We apply our scheme to calculate Green's function, the spectral function, and the charge compressibility in the two-dimensional Hubbard model. Our scheme yields significant qualitative and quantitative improvements over the standard $GW$ method and successfully captures the pseudogap behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_16762 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Post-$GW$ theory and its application to pseudogap in strongly correlated system Li, Hui Su, Yingze Xiong, Junnian Lin, Haiqing Huang, Huaqing Li, Dingping Strongly Correlated Electrons The $GW$ approximation is a widely used framework for studying correlated materials, but it struggles with certain limitations, such as its inability to explain pseudogap phenomena. To overcome these problems, we propose a systematic theoretical framework for Green's function corrections and apply it specifically to the $GW$ approximation. In this new theory, the screened potential is reconnected to the physical response function, i.e. the covariant response function proposed in \cite{cGW_2023}, rather than using the RPA formula. We apply our scheme to calculate Green's function, the spectral function, and the charge compressibility in the two-dimensional Hubbard model. Our scheme yields significant qualitative and quantitative improvements over the standard $GW$ method and successfully captures the pseudogap behavior. |
| title | Post-$GW$ theory and its application to pseudogap in strongly correlated system |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.16762 |