Interference and short-range correlation in fermionic Hubbard gases
Fuente:
arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
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| _version_ | 1866911066669187072 |
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| author | Zhu, Yan-Song Shao, Hou-Ji Wang, Yu-Xuan Zhu, De-Zhi Sun, Hao-Nan Chen, Si-Yuan Zhang, Chi Yao, Xing-Can Chen, Yu-Ao Pan, Jian-Wei |
| author_facet | Zhu, Yan-Song Shao, Hou-Ji Wang, Yu-Xuan Zhu, De-Zhi Sun, Hao-Nan Chen, Si-Yuan Zhang, Chi Yao, Xing-Can Chen, Yu-Ao Pan, Jian-Wei |
| contents | The interference patterns of ultracold atoms, observed after ballistic expansion from optical lattices, encode essential information about strongly correlated lattice systems, including phase coherence and non-local correlations. While the interference of lattice bosons has been extensively investigated, quantitative studies of the lattice fermion interference remain challenging. Here, we report the observation and quantitative characterization of interference patterns in low-temperature, homogeneous fermionic Hubbard gases. We develop a novel method to extract first-order correlations from interference patterns, which directly reflect the short-range phase coherence of lattice fermions. Mapping the nearest-neighbor correlations as a function of lattice filling and interaction strength, we observe a crossover from a metal to a Mott insulator. Moreover, at half filling, the measured correlations agree well with quantum Monte Carlo calculations and remain finite in the regime of strong repulsion, revealing virtual tunneling processes driven by quantum fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_14868 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interference and short-range correlation in fermionic Hubbard gases Zhu, Yan-Song Shao, Hou-Ji Wang, Yu-Xuan Zhu, De-Zhi Sun, Hao-Nan Chen, Si-Yuan Zhang, Chi Yao, Xing-Can Chen, Yu-Ao Pan, Jian-Wei Quantum Gases Strongly Correlated Electrons Quantum Physics The interference patterns of ultracold atoms, observed after ballistic expansion from optical lattices, encode essential information about strongly correlated lattice systems, including phase coherence and non-local correlations. While the interference of lattice bosons has been extensively investigated, quantitative studies of the lattice fermion interference remain challenging. Here, we report the observation and quantitative characterization of interference patterns in low-temperature, homogeneous fermionic Hubbard gases. We develop a novel method to extract first-order correlations from interference patterns, which directly reflect the short-range phase coherence of lattice fermions. Mapping the nearest-neighbor correlations as a function of lattice filling and interaction strength, we observe a crossover from a metal to a Mott insulator. Moreover, at half filling, the measured correlations agree well with quantum Monte Carlo calculations and remain finite in the regime of strong repulsion, revealing virtual tunneling processes driven by quantum fluctuations. |
| title | Interference and short-range correlation in fermionic Hubbard gases |
| topic | Quantum Gases Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2507.14868 |