Mobile impurity interacting with a Hubbard chain and the role of Friedel oscillations
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
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| _version_ | 1866911425838972928 |
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| author | Isaule, Felipe Rojo-Francàs, Abel Hoang, Duc Tuan Fogarty, Thomás Busch, Thomas Juliá-Díaz, Bruno |
| author_facet | Isaule, Felipe Rojo-Francàs, Abel Hoang, Duc Tuan Fogarty, Thomás Busch, Thomas Juliá-Díaz, Bruno |
| contents | This work examines a mobile impurity interacting with a bath of a few spin-$\uparrow$ and spin-$\downarrow$ fermions in a small one-dimensional open lattice system. We study ground-state properties using the exact diagonalization method, where the system is modeled by a three-component Fermi Hubbard Hamiltonian. We find that in addition to the standard phase separation between a strongly repulsive impurity and the bath, a strongly-attractive impurity also phase separates with the fermionic holes. Furthermore, we find that the impurity can show an oscillatory pattern in its density for intermediate bath-impurity interactions, which are induced by Friedel oscillations in the fermionic bath. This rich behavior of the impurity could be probed with fermionic ultracold mixtures in optical lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_06169 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mobile impurity interacting with a Hubbard chain and the role of Friedel oscillations Isaule, Felipe Rojo-Francàs, Abel Hoang, Duc Tuan Fogarty, Thomás Busch, Thomas Juliá-Díaz, Bruno Quantum Gases This work examines a mobile impurity interacting with a bath of a few spin-$\uparrow$ and spin-$\downarrow$ fermions in a small one-dimensional open lattice system. We study ground-state properties using the exact diagonalization method, where the system is modeled by a three-component Fermi Hubbard Hamiltonian. We find that in addition to the standard phase separation between a strongly repulsive impurity and the bath, a strongly-attractive impurity also phase separates with the fermionic holes. Furthermore, we find that the impurity can show an oscillatory pattern in its density for intermediate bath-impurity interactions, which are induced by Friedel oscillations in the fermionic bath. This rich behavior of the impurity could be probed with fermionic ultracold mixtures in optical lattices. |
| title | Mobile impurity interacting with a Hubbard chain and the role of Friedel oscillations |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2602.06169 |