2011/07/03 by M. Imada, Masatoshi Imada, Y. Yamaji +5 · 19 citations
Materials Science · Physics and Astronomy · #Cuprate #Fermi Gamma-ray Space Telescope #Fermi surface #Iron-based superconductors research #Mott insulator #Pairing #Physics of Superconductivity and Magnetism #Pseudogap #Quasiparticle #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #physics.comp-ph #quant-ph
paper · pdf · doi:10.1002/andp.201100028
published in Annalen der Physik 523(8-9), 629-637 (Wiley) · 8 pages, 6 figures
arxiv created 2011/07/03 · openalex publication_date 2011/08/26 · arxiv updated 2011/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract Underdoped Mott insulators provide us with a challenge of many‐body physics. Recent renewed understanding is discussed in terms of the evolution of pole and zero structure of the single‐particle Green's function. Pseudogap as well as Fermi arc/pocket structure in the underdoped cuprates is well reproduced from the recent cluster extension of the dynamical mean‐field theory. Emergent coexisting zeros and poles set the underdoped Mott insulator apart from the Fermi liquid, separated by topological transitions. The cofermion proposed as a generalization of exciton in the slave‐boson framework accounts for the origin of the zero surface formation. The cofermion‐quasiparticle hybridization gap offers a natural understanding of the pseudogap and various unusual Mottness. Furthermore the cofermion offers a novel pairing mechanism, where the cofermion has two roles: It reinforces the Cooper pair as a pair partner of the quasiparticle and acts as a glue as well. It provides a strong insight for solving the puzzle found in the dichotomy of the gap structure.