True vs false Fermi surfaces in the Pseudogap regime and their transformation with doping and temperature in the Hubbard Model
This research uses advanced quantum Monte Carlo methods ($ ext{TPSC}^+$) to study real-frequency energy and momentum distributions in the Hubbard Model's pseudogap phase. It finds that standard Fermi liquid descriptions fail, revealing 'false' Fermi surfaces and zero-energy quasiparticle lines. These features emerge based on temperature and doping, indicating a complex transition towards an insulating state driven by critical spin fluctuations.