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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.18325 |
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| _version_ | 1866912506284343296 |
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| author | Meixner, Michael Krämer, Marcel Wentzell, Nils Bonetti, Pietro M. Andergassen, Sabine Toschi, Alessandro Schäfer, Thomas |
| author_facet | Meixner, Michael Krämer, Marcel Wentzell, Nils Bonetti, Pietro M. Andergassen, Sabine Toschi, Alessandro Schäfer, Thomas |
| contents | The destruction of metallicity due to the mutual Coulomb interaction of quasiparticles gives rise to fascinating phenomena of solid state physics such as the Mott metal-insulator transition and the pseudogap. A key observable characterizing their occurrences is the single-particle spectral function, determined by the fermionic self-energy. In this paper we investigate in detail how real space fluctuations are responsible for a self-energy that drives the Mott-Hubbard metal-insulator transition. To this aim we first introduce a real space fluctuation diagnostics approach to the Hedin equation, which connects the fermion-boson coupling vertex $λ$ to the self-energy $Σ$. Second, by using cellular dynamical mean-field theory calculations for $λ$ we identify the leading physical processes responsible for the destruction of metallicity across the transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18325 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Disentangling real space fluctuations: the diagnostics of metal-insulator transitions beyond single-particle spectral functions Meixner, Michael Krämer, Marcel Wentzell, Nils Bonetti, Pietro M. Andergassen, Sabine Toschi, Alessandro Schäfer, Thomas Strongly Correlated Electrons The destruction of metallicity due to the mutual Coulomb interaction of quasiparticles gives rise to fascinating phenomena of solid state physics such as the Mott metal-insulator transition and the pseudogap. A key observable characterizing their occurrences is the single-particle spectral function, determined by the fermionic self-energy. In this paper we investigate in detail how real space fluctuations are responsible for a self-energy that drives the Mott-Hubbard metal-insulator transition. To this aim we first introduce a real space fluctuation diagnostics approach to the Hedin equation, which connects the fermion-boson coupling vertex $λ$ to the self-energy $Σ$. Second, by using cellular dynamical mean-field theory calculations for $λ$ we identify the leading physical processes responsible for the destruction of metallicity across the transition. |
| title | Disentangling real space fluctuations: the diagnostics of metal-insulator transitions beyond single-particle spectral functions |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.18325 |