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

ABSTRACT: The origin of the pseudogap behavior, found in many high-T_c 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 sys

SUBMITTER: Jiang W 

PROVIDER: S-EPMC9098861 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature