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

https://doi.org/10.1038/s41467-022-30302-x

Jiang, Weilun; Liu, Yuzhi; Klein, Avraham; Wang, Yuxuan; Sun, Kai; Chubukov, Andrey V.; Meng, Zi Yang (May 2022, Nature Communications)

Abstract The origin of the pseudogap behavior, found in many high-T_csuperconductors, 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.
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Dynamical exponent of a quantum critical itinerant ferromagnet: A Monte Carlo study

https://doi.org/10.1103/PhysRevB.105.L041111

Liu, Yuzhi; Jiang, Weilun; Klein, Avraham; Wang, Yuxuan; Sun, Kai; Chubukov, Andrey V.; Meng, Zi Yang (January 2022, Physical Review B)
Hadronic-vacuum-polarization contribution to the muon’s anomalous magnetic moment from four-flavor lattice QCD

https://doi.org/10.1103/PhysRevD.101.034512

Davies, C. T. H.; DeTar, C.; El-Khadra, A. X.; Gámiz, E.; Gottlieb, Steven; Hatton, D.; Kronfeld, A. S.; Laiho, J.; Lepage, G. P.; Liu, Yuzhi; et al (February 2020, Physical Review D)

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$B_{s} \to K ℓ ν$ decay from lattice QCD

https://doi.org/10.1103/PhysRevD.100.034501

Bazavov, A.; Bernard, C.; DeTar, C.; Du, Daping; El-Khadra, A. X.; Freeland, E. D.; Gámiz, E.; Gelzer, Z.; Gottlieb, Steven; Heller, U. M.; et al (August 2019, Physical Review D)

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Semileptonic B -meson decays to light pseudoscalar mesons on the HISQ ensembles

https://doi.org/10.1051/epjconf/201817513024

Gelzer, Zechariah; Bernard, C.; Tar, C. De; El-Khadra, AX; Gámiz, E.; Gottlieb, Steven; Kronfeld, Andreas S.; Liu, Yuzhi; Meurice, Y.; Simone, J.N.; et al (January 2018, EPJ Web of Conferences)

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Strong-Isospin-Breaking Correction to the Muon Anomalous Magnetic Moment from Lattice QCD at the Physical Point

https://doi.org/10.1103/PhysRevLett.120.152001

Chakraborty, B.; Davies, C. T. H.; DeTar, C.; El-Khadra, A. X.; Gámiz, E.; Gottlieb, Steven; Hatton, D.; Koponen, J.; Kronfeld, A. S.; Laiho, J.; et al (April 2018, Physical Review Letters)

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B _s → Kℓv form factors with 2+1 flavors

https://doi.org/10.1051/epjconf/201817513008

Liu, Yuzhi; Bailey, Jon A.; Bazavov, A.; Bernard, C.; Bouchard, C. M.; DeTar, C.; Du, Daping; El-Khadra, A. X.; Freeland, E. D.; Gámiz, E.; et al (January 2018, EPJ Web of Conferences)

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