Journal
ANNALEN DER PHYSIK
Volume 523, Issue 8-9, Pages 629-637Publisher
WILEY-BLACKWELL
DOI: 10.1002/andp.201100028
Keywords
Pseudogap; high-T(c) superconductivity; cofermion; dynamical mean-field theory
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Funding
- Grants-in-Aid for Scientific Research [22340090, 10J09068] Funding Source: KAKEN
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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. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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