Strong pairing in mixed-dimensional bilayer antiferromagnetic Mott insulators
Strong pairing in mixed-dimensional bilayer antiferromagnetic Mott insulators
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DOI：
10.1038/s41567-022-01561-8
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发表时间：
2022-04-21
期刊：
影响因子：
19.6
通讯作者：
Grusdt, Fabian
中科院分区：
文献类型：
--
作者：
Bohrdt, Annabelle;Homeier, Lukas;Grusdt, Fabian
研究冷原子中的非传统配对机制需要超低温度。大规模数值计算表明，某些双层模型允许在更接近的温度下深度结合和高迁移率的电荷对。在降维环境中相互作用的多体系统，如梯形和少层系统，具有增强的量子涨落的特征。最近，二维双层体系引起了相当大的兴趣，因为它们可以包含不寻常的相，包括非传统的超导电性。在这里，我们提出了在一类双层Hubbard模型中实现费米子高温配对的理论建议。我们介绍了一种用于掺杂反铁磁性Mott绝缘体中的移动载流子的通用高效配对机制。这种配对是由一种电荷沿着另一种电荷产生的路径获得的能量引起的。结果表明，在混合维Fermi-Hubbard双层体系中，这一机制导致了高迁移率但紧密束缚对的形成。这种设置与费米-哈伯德模型密切相关，据信费米-哈伯德模型捕捉了铜氧化物的物理，并可以在目前可用的超冷原子实验中实现。
Studies of unconventional pairing mechanisms in cold atoms require ultralow temperatures. Large-scale numerics show that certain bilayer models allow for deeply bound and highly mobile pairs of charges at more accessible temperatures.Interacting many-body systems in reduced-dimensional settings, such as ladders and few-layer systems, are characterized by enhanced quantum fluctuations. Recently, two-dimensional bilayer systems have sparked considerable interest because they can host unusual phases, including unconventional superconductivity. Here we present a theoretical proposal for realizing high-temperature pairing of fermions in a class of bilayer Hubbard models. We introduce a general and highly efficient pairing mechanism for mobile charge carriers in doped antiferromagnetic Mott insulators. The pairing is caused by the energy that one charge gains when it follows the path created by another charge. We show that this mechanism leads to the formation of highly mobile but tightly bound pairs in the case of mixed-dimensional Fermi-Hubbard bilayer systems. This setting is closely related to the Fermi-Hubbard model believed to capture the physics of copper oxides, and can be realized in currently available ultracold atom experiments.