Purely electronic model for exciton-polaron formation in moiré heterostructures
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910208332136448 |
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| author | Pichler, Fabian Hafezi, Mohammad Knap, Michael |
| author_facet | Pichler, Fabian Hafezi, Mohammad Knap, Michael |
| contents | Understanding interactions between excitons and correlated electronic states presents a fundamental challenge in quantum many-body physics. Here, we introduce a purely electronic model for the formation of exciton-polarons in moiré lattices. Unlike conventional approaches that treat excitons as tightly-bound bosonic particles, our model considers only electronic degrees of freedom, describing excitons as electron-hole bound states. Our findings reveal a pronounced renormalization of the polaron mass as a function of electron density, particularly near correlated insulators, consistent with recent transport experiments. Additionally, we predict an observable sign change in the effective polaron mass when increasing the electron density that can be measured in Hall-type experiments. Our purely electronic model provides a unified framework to investigate the formation and renormalization of exciton-polarons in correlated states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_07712 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Purely electronic model for exciton-polaron formation in moiré heterostructures Pichler, Fabian Hafezi, Mohammad Knap, Michael Strongly Correlated Electrons Mesoscale and Nanoscale Physics Quantum Gases Understanding interactions between excitons and correlated electronic states presents a fundamental challenge in quantum many-body physics. Here, we introduce a purely electronic model for the formation of exciton-polarons in moiré lattices. Unlike conventional approaches that treat excitons as tightly-bound bosonic particles, our model considers only electronic degrees of freedom, describing excitons as electron-hole bound states. Our findings reveal a pronounced renormalization of the polaron mass as a function of electron density, particularly near correlated insulators, consistent with recent transport experiments. Additionally, we predict an observable sign change in the effective polaron mass when increasing the electron density that can be measured in Hall-type experiments. Our purely electronic model provides a unified framework to investigate the formation and renormalization of exciton-polarons in correlated states. |
| title | Purely electronic model for exciton-polaron formation in moiré heterostructures |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Quantum Gases |
| url | https://arxiv.org/abs/2503.07712 |