Observation of antiferromagnetic correlations in an ultracold SU(N) Hubbard model

Observation of antiferromagnetic correlations in an ultracold SU(N) Hubbard model
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超冷 SU(N) Hubbard 模型中反铁磁相关性的观察

DOI:
10.1038/s41567-022-01725-6
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发表时间:
2022
期刊:
影响因子:
19.6
通讯作者:
Takahashi, Yoshiro
Takahashi, Yoshiro
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Taie, Shintaro;Ibarra-García-Padilla, Eduardo;Nishizawa, Naoki;Takasu, Yosuke;Kuno, Yoshihito;Wei, Hao-Tian;Scalettar, Richard T.;Hazzard, Kaden R.;Takahashi, Yoshiro

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Mott insulators are paradigmatic examples of strongly correlated physics from which many phases of quantum matter with hard-to-explain properties emerge. Extending the typical SU(2) spin symmetry of Mott insulators to SU(N) is predicted to produce exotic quantum magnetism at low temperatures. In this work, we experimentally observe nearest-neighbour spin correlations in a SU(6) Hubbard model realized by ytterbium atoms in optical lattices. We study one-dimensional, two-dimensional square and three-dimensional cubic lattice geometries. The measured SU(6) spin correlations are enhanced compared with the SU(2) correlations, owing to strong Pomeranchuk cooling. The experimental data for a one-dimensional lattice agree qualitatively with our theoretical calculations, with an error of at most 30%, without any fitting parameters. Detailed comparison between theory and experiment allows us to infer the temperature to be the lowest achieved for a cold-atom Fermi–Hubbard model. For three-dimensional lattices, the experiments reach entropies below the regime where our calculations converge, highlighting the importance of these experiments as quantum simulations.
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