Quantifying the role of antiferromagnetic fluctuations in the superconductivity of the doped Hubbard model
Quantifying the role of antiferromagnetic fluctuations in the superconductivity of the doped Hubbard model
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DOI：
10.1038/s41567-022-01710-z
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发表时间：
2022-02
期刊：
影响因子：
19.6
通讯作者：
Xi-ying Dong;E. Gull;A. Millis
中科院分区：
文献类型：
--
作者：
Xi-ying Dong;E. Gull;A. Millis
超导性产生于电荷电子配对成电荷2玻色子--称为库珀对--以及它们凝聚成相干量子态。在高温超导体中，电子配对成库珀对的确切机制仍不清楚。其中一个可能的候选者是自旋涨落可以提供一个有吸引力的有效相互作用，使之成为可能。在这里，我们研究的贡献的电子自旋涨落耦合的二维Hubbard模型的超导态的动力学集群近似使用一个精确的数值连续时间的Monte Carlo求解器。我们发现，只有大约一半的超导性可以归因于一个配对机制所产生的治疗自旋波动作为一个配对玻色子在标准的单圈理论。其余的配对相互作用必须来自尚未确定的高能过程。
Superconductivity arises from the pairing of charge-eelectrons into charge-2ebosons—called Cooper pairs—and their condensation into a coherent quantum state. The exact mechanism by which electrons pair up into Cooper pairs in high-temperature superconductors is still not understood. One of the plausible candidates is that spin fluctuations can provide an attractive effective interaction that enables this, –. Here we study the contribution of the electron–spin-fluctuation coupling to the superconducting state of the two-dimensional Hubbard model within dynamical cluster approximation using a numerically exact continuous-time Monte Carlo solver. We show that only about half of the superconductivity can be attributed to a pairing mechanism arising from treating spin fluctuations as a pairing boson in the standard one-loop theory. The rest of the pairing interaction must come from as-yet unidentified higher-energy processes.