Antiferromagnetic Correlations in Two-Dimensional Fermionic Mott-Insulating and Metallic Phases.
Antiferromagnetic Correlations in Two-Dimensional Fermionic Mott-Insulating and Metallic Phases.
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DOI：
10.1103/physrevlett.118.170401
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发表时间：
2016-07
影响因子：
8.6
通讯作者：
J. Drewes;L. Miller;E. Cocchi;C. F. Chan;N. Wurz;M. Gall;D. Pertot;F. Brennecke;M. Köhl
中科院分区：
文献类型：
--
作者：
J. Drewes;L. Miller;E. Cocchi;C. F. Chan;N. Wurz;M. Gall;D. Pertot;F. Brennecke;M. Köhl
实验研究了二维光学晶格中超冷费米子原子随温度降低而产生的反铁磁关联。我们通过同时测量两个自旋分量的原位密度分布来确定二维Hubbard模型的均匀磁化率。在半填充和强相互作用下，我们的数据接近具有反铁磁相关的局域自旋的海森堡模型。此外，我们观察到当掺杂系统远离半填充时，磁相关性会快速衰减。
We experimentally study the emergence of antiferromagnetic correlations between ultracold fermionic atoms in a two-dimensional optical lattice with decreasing temperature. We determine the uniform magnetic susceptibility of the two-dimensional Hubbard model from simultaneous measurements of the in situ density distribution of both spin components. At half filling and strong interactions our data approach the Heisenberg model of localized spins with antiferromagnetic correlations. Moreover, we observe a fast decay of magnetic correlations when doping the system away from half filling.