Theory of pseudogap and superconductivity in doped Mott insulators

Masatoshi Imada, Y. Yamaji, S. Sakai, Y. Motome

Research output: Contribution to journalArticle

17 Citations (Scopus)

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. 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.

Original languageEnglish
Pages (from-to)629-637
Number of pages9
JournalAnnalen der Physik (Leipzig)
Volume523
Issue number8-9
DOIs
Publication statusPublished - 2011 Aug 1
Externally publishedYes

Fingerprint

poles
superconductivity
insulators
dichotomies
glues
Fermi liquids
cuprates
Green's functions
bosons
arcs
excitons
physics

Keywords

  • cofermion
  • dynamical mean-field theory.
  • high-T superconductivity
  • Pseudogap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Theory of pseudogap and superconductivity in doped Mott insulators. / Imada, Masatoshi; Yamaji, Y.; Sakai, S.; Motome, Y.

In: Annalen der Physik (Leipzig), Vol. 523, No. 8-9, 01.08.2011, p. 629-637.

Research output: Contribution to journalArticle

Imada, Masatoshi ; Yamaji, Y. ; Sakai, S. ; Motome, Y. / Theory of pseudogap and superconductivity in doped Mott insulators. In: Annalen der Physik (Leipzig). 2011 ; Vol. 523, No. 8-9. pp. 629-637.
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