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Competing magnetic orders in a bilayer Hubbard model with ultracold atoms

机译:使用超薄原子竞争磁性订单。使用超级原子

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摘要

Fermionic atoms in optical lattices have served as a useful model system in which to study and emulate the physics of strongly correlated matter. Driven by the advances of high-resolution microscopy, the current research focus is on two-dimensional systems(1-3), in which several quantum phases-such as antiferromagnetic Mott insulators for repulsive interactions(4-7) and charge-density waves for attractive interactions(8)-have been observed. However, the lattice structure of real materials, such as bilayer graphene, is composed of coupled layers and is therefore not strictly two-dimensional, which must be taken into account in simulations. Here we realize a bilayer Fermi-Hubbard model using ultracold atoms in an optical lattice, and demonstrate that the interlayer coupling controls a crossover between a planar antiferromagnetically ordered Mott insulator and a band insulator of spin-singlets along the bonds between the layers. We probe the competition of the magnetic ordering by measuring spin-spin correlations both within and between the two-dimensional layers. Our work will enable the exploration of further properties of coupled-layer Hubbard models, such as theoretically predicted superconducting pairing mechanisms(9,10).
机译:光学格子中的Fermionic原子已作为一种有用的模型系统,用于研究和模仿强烈相关的物理。通过高分辨率显微镜的进步驱动,目前的研究重点是二维系统(1-3),其中几个量子相 - 例如反铁磁体薄膜绝缘体,用于排斥相互作用(4-7)和电荷密度波对于有吸引力的相互作用(8) - 观察到。然而,真实材料的晶格结构,例如双层石墨烯,由耦合层组成,因此不严格二维,必须考虑在模拟中。在这里,我们在光学晶格中实现了双层FERMI-HUBBARD模型,并证明层间耦合控制平面反铁磁性有序的MOTT绝缘体和沿层之间的键合的旋转单曲的带绝缘体之间的交叉。我们通过测量二维层内和之间的旋转旋转相关性来探讨磁性排序的竞争。我们的作品将能够探索耦合层毂谱型号的进一步性质,例如理论上预测的超导配对机构(9,10)。

著录项

  • 来源
    《Nature》 |2021年第7840期|40-43|共4页
  • 作者单位

    Univ Bonn Phys Inst Bonn Germany;

    Univ Bonn Phys Inst Bonn Germany;

    Univ Bonn Phys Inst Bonn Germany;

    Univ Bonn Phys Inst Bonn Germany;

    Univ Bonn Phys Inst Bonn Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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