Downfolding a quantum many-body system: the quasi-1D Fermi polaron
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912572806004736 |
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| author | Barišić, Lovro Anto Orso, Giuliano Chevy, Frédéric Van Houcke, Kris |
| author_facet | Barišić, Lovro Anto Orso, Giuliano Chevy, Frédéric Van Houcke, Kris |
| contents | We investigate the properties of an impurity immersed in an ensemble of spin-polarized fermions confined in a tight quantum wire. We use a non-perturbative variational approach that accounts for virtual transverse excitations and regularizes the zero-range interaction. We compute the polaron's energy, effective mass, and spectral weight, and benchmark our results against the exactly solvable Yang-Gaudin model of a purely 1D system. While the two models agree in the weakly interacting regime, we find significant deviations in the strongly attractive limit, including a divergence of the effective mass and evidence for a polaron-to-molecule transition inherited from the underlying 3D physics, which is absent in the purely 1D description. Our work quantifies the accuracy of quasi-1D systems as analog quantum simulators and highlights the emergence of beyond-1D physics even in nominally 1D settings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04934 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Downfolding a quantum many-body system: the quasi-1D Fermi polaron Barišić, Lovro Anto Orso, Giuliano Chevy, Frédéric Van Houcke, Kris Quantum Gases We investigate the properties of an impurity immersed in an ensemble of spin-polarized fermions confined in a tight quantum wire. We use a non-perturbative variational approach that accounts for virtual transverse excitations and regularizes the zero-range interaction. We compute the polaron's energy, effective mass, and spectral weight, and benchmark our results against the exactly solvable Yang-Gaudin model of a purely 1D system. While the two models agree in the weakly interacting regime, we find significant deviations in the strongly attractive limit, including a divergence of the effective mass and evidence for a polaron-to-molecule transition inherited from the underlying 3D physics, which is absent in the purely 1D description. Our work quantifies the accuracy of quasi-1D systems as analog quantum simulators and highlights the emergence of beyond-1D physics even in nominally 1D settings. |
| title | Downfolding a quantum many-body system: the quasi-1D Fermi polaron |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2509.04934 |