Enhanced Strange Metallicity due to Hubbard-U Coulomb Repulsion
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929687445372928 |
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| author | Hardy, Andrew Parcollet, Olivier Georges, Antoine Patel, Aavishkar A. |
| author_facet | Hardy, Andrew Parcollet, Olivier Georges, Antoine Patel, Aavishkar A. |
| contents | We solve a model of electrons with Hubbard-$U$ Coulomb repulsion and a random Yukawa coupling to a two-dimensional bosonic bath, using an extended dynamical mean field theory scheme. Our model exhibits a quantum critical point, at which the repulsive component of the electron interactions strongly enhances the effects of the quantum critical bosonic fluctuations on the electrons, leading to a breakdown of Fermi liquid physics and the formation of a strange metal with `Planckian' ($\mathcal{O}(k_B T/\hbar)$) quasiparticle decay rates at low temperatures $T\rightarrow 0$. Furthermore, the eventual Mott transition that occurs as the repulsion is increased seemingly bounds the maximum decay rate in the strange metal. Our results provide insight into low-temperature strange metallicity observed in proximity to a Mott transition, as is observed, for instance, in recent experiments on certain moiré materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_21102 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Enhanced Strange Metallicity due to Hubbard-U Coulomb Repulsion Hardy, Andrew Parcollet, Olivier Georges, Antoine Patel, Aavishkar A. Strongly Correlated Electrons We solve a model of electrons with Hubbard-$U$ Coulomb repulsion and a random Yukawa coupling to a two-dimensional bosonic bath, using an extended dynamical mean field theory scheme. Our model exhibits a quantum critical point, at which the repulsive component of the electron interactions strongly enhances the effects of the quantum critical bosonic fluctuations on the electrons, leading to a breakdown of Fermi liquid physics and the formation of a strange metal with `Planckian' ($\mathcal{O}(k_B T/\hbar)$) quasiparticle decay rates at low temperatures $T\rightarrow 0$. Furthermore, the eventual Mott transition that occurs as the repulsion is increased seemingly bounds the maximum decay rate in the strange metal. Our results provide insight into low-temperature strange metallicity observed in proximity to a Mott transition, as is observed, for instance, in recent experiments on certain moiré materials. |
| title | Enhanced Strange Metallicity due to Hubbard-U Coulomb Repulsion |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2407.21102 |