Direct observation of nonlocal fermion pairing in an attractive Fermi-Hubbard gas

Direct observation of nonlocal fermion pairing in an attractive Fermi-Hubbard gas
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直接观察有吸引力的费米-哈伯德气体中的非局域费米子配对

DOI:
10.1126/science.ade4245
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发表时间:
2023
期刊:
影响因子:
56.9
通讯作者:
Zwierlein, Martin
Zwierlein, Martin
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hartke, Thomas;Oreg, Botond;Turnbaugh, Carter;Jia, Ningyuan;Zwierlein, Martin

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吸引相互作用费米子的哈伯德模型为费米子配对提供了一个范例。它的特点是紧密束缚对的玻色-爱因斯坦凝聚和长程库珀对的Bardeen-Cooper-Schrieffer超流之间的交叉,以及在超流体临界温度以上形成对的“伪间隙”区域。我们在双层显微镜下,利用1000个费米子钾-40原子的自旋和密度分辨成像,直接观察到哈伯德格子气体中费米子配对的非局域性质。随着全球自旋涨落的消失和吸引力的增加,完全费米子配对被揭示出来。在强关联区域,费米子对的大小约为平均粒子间距的数量级。我们的研究为强关联费米子系统中的赝隙行为提供了理论依据。
The Hubbard model of attractively interacting fermions provides a paradigmatic setting for fermion pairing. It features a crossover between Bose-Einstein condensation of tightly bound pairs and Bardeen-Cooper-Schrieffer superfluidity of long-range Cooper pairs, and a “pseudo-gap” region where pairs form above the superfluid critical temperature. We directly observe the nonlocal nature of fermion pairing in a Hubbard lattice gas, using spin- and density-resolved imaging of1000 fermionic potassium-40 atoms under a bilayer microscope. Complete fermion pairing is revealed by the vanishing of global spin fluctuations with increasing attraction. In the strongly correlated regime, the fermion pair size is found to be on the order of the average interparticle spacing. Our study informs theories of pseudo-gap behavior in strongly correlated fermion systems.
DOI: 10.1126/science.abe7165
发表时间: 2020-09
期刊: Science
影响因子: 56.9
作者:
J. Koepsell;Dominik Bourgund;P. Sompet;Sarah Hirthe;A. Bohrdt;Yao Wang;F. Grusdt;E. Demler;G. Salomon;C. Gross;I. Bloch
通讯作者: J. Koepsell;Dominik Bourgund;P. Sompet;Sarah Hirthe;A. Bohrdt;Yao Wang;F. Grusdt;E. Demler;G. Salomon;C. Gross;I. Bloch
DOI: 10.1038/s41586-019-1463-1
发表时间: 2019-08-15
期刊: NATURE
影响因子: 64.8
作者:
Koepsell, Joannis;Vijayan, Jayadev;Gross, Christian
通讯作者: Gross, Christian
关于有吸引力的哈伯德模型的相图:交叉和量子临界现象
DOI: --
发表时间: 1998
期刊:
影响因子: --
作者:
J. M. Singer;T. Schneider;M. H. Pedersen
通讯作者: M. H. Pedersen