Quantum Phase Transitions in 2D--dimensional paramagnetic half--filled Hubbard model
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914920767946752 |
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| author | Chashchin, N. I. |
| author_facet | Chashchin, N. I. |
| contents | We investigate the quantum phase transitions in strongly correlated electronic systems at $T=0^0K$ by the example of the 2D Hubbard model. The model for numerical calculations were formalized in terms of the integral equations previously obtained for the half--filled paramagnetic Hubbard model by means of the variational derivatives technique and subsequent Legendre transformation. For principal results we submit in series the momentum distribution functions $n(k)$ which display distinct attributes for the incipient regimes: the pure doublon phase, the metal phase, Weyl semimetal phase, and Weyl excitonic insulator phase at the sequential increasing the onsite Coulomb interaction $U$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_12284 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quantum Phase Transitions in 2D--dimensional paramagnetic half--filled Hubbard model Chashchin, N. I. Strongly Correlated Electrons Mathematical Physics 45F15 G.1 We investigate the quantum phase transitions in strongly correlated electronic systems at $T=0^0K$ by the example of the 2D Hubbard model. The model for numerical calculations were formalized in terms of the integral equations previously obtained for the half--filled paramagnetic Hubbard model by means of the variational derivatives technique and subsequent Legendre transformation. For principal results we submit in series the momentum distribution functions $n(k)$ which display distinct attributes for the incipient regimes: the pure doublon phase, the metal phase, Weyl semimetal phase, and Weyl excitonic insulator phase at the sequential increasing the onsite Coulomb interaction $U$. |
| title | Quantum Phase Transitions in 2D--dimensional paramagnetic half--filled Hubbard model |
| topic | Strongly Correlated Electrons Mathematical Physics 45F15 G.1 |
| url | https://arxiv.org/abs/2408.12284 |