Dong, X., Del Re, L., Toschi, A., & Gull, E. (2022). Mechanism of superconductivity in the Hubbard model at intermediate interaction strength. Proceedings of the National Academy of Sciences, 119(33), 1–6. https://doi.org/10.1073/pnas.2205048119
Spin fluctuation theory; Strongly correlated system; Superconductivity; Cluster dynamical mean field theory, Hubbard model
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Abstract:
We study the fluctuations responsible for pairing in the d-wave superconducting state of the two-dimensional Hubbard model at intermediate coupling within a cluster dynamical mean-field theory with a numerically exact quantum impurity solver. By analyzing how momentum- and frequency-dependent fluctuations generate the d-wave superconducting state in different representations, we identify antiferromagnetic fluctuations as the pairing glue of superconductivity in both the underdoped and the overdoped regime. Nevertheless, in the intermediate coupling regime, the predominant magnetic fluctuations may differ significantly from those described by conventional spin fluctuation theory.
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Research facilities:
Vienna Scientific Cluster
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Project title:
Quantum phase transitions and collective modes: I 5868-N (Fonds zur Förderung der wissenschaftlichen Forschung (FWF))
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Project (external):
. Department of Energy, Office ofScience, Basic US Energy Sciences, Division of Materials Sciences and Engineerin
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Project ID:
Grant No. DE-SC001946
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Research Areas:
Quantum Many-body Systems Physics: 32% Computational Materials Science: 68%
