Monte Carlo study of the pseudogap and superconductivity emerging from quantum magnetic fluctuations

Weilun Jiang, Yuzhi Liu, Avraham Klein, Yuxuan Wang, Kai Sun, Andrey V. Chubukov and Zi Yang Meng ()
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Weilun Jiang: Chinese Academy of Sciences
Yuzhi Liu: Chinese Academy of Sciences
Avraham Klein: Ariel University
Yuxuan Wang: University of Florida
Kai Sun: University of Michigan
Andrey V. Chubukov: University of Minnesota
Zi Yang Meng: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The origin of the pseudogap behavior, found in many high-Tc superconductors, remains one of the greatest puzzles in condensed matter physics. One possible mechanism is fermionic incoherence, which near a quantum critical point allows pair formation but suppresses superconductivity. Employing quantum Monte Carlo simulations of a model of itinerant fermions coupled to ferromagnetic spin fluctuations, represented by a quantum rotor, we report numerical evidence of pseudogap behavior, emerging from pairing fluctuations in a quantum-critical non-Fermi liquid. Specifically, we observe enhanced pairing fluctuations and a partial gap opening in the fermionic spectrum. However, the system remains non-superconducting until reaching a much lower temperature. In the pseudogap regime the system displays a “gap-filling" rather than “gap-closing" behavior, similar to the one observed in cuprate superconductors. Our results present direct evidence of the pseudogap state, driven by superconducting fluctuations.

Date: 2022
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DOI: 10.1038/s41467-022-30302-x

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