Theory of pseudogap and superconductivity in doped Mott insulators

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. 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.

8 pages, 6 figures

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Cited by in corpus (12)

• Strong coupling superconductivity, pseudogap and Mott transition
• Evidence for hidden fermion that triggers high-temperature superconductivity in cuprates
• Lifshitz Transition in the Two Dimensional Hubbard Model
• Topological interpretation of Luttinger theorem
• Correlation-driven Lifshitz transition at the emergence of the pseudogap phase in the two-dimensional Hubbard model
• Evolution of the Superconductivity Dome in the two dimensional Hubbard Model
• Hidden-Fermion Representation of Self-energy in Pseudogap and Superconducting States of Two-Dimensional Hubbard Model
• Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling
• Isolated zeros destroy Fermi surface in holographic models with a lattice
• Direct Connection between Mott Insulator and d-Wave High-Temperature Superconductor Revealed by Continuous Evolution of Self-Energy Poles
• Hidden fermionic excitation in the superconductivity of the strongly attractive Hubbard model
• Brillouin-zone integration scheme for many-body density of states: Tetrahedron method combined with cluster perturbation theory