This article is dedicated to Dieter Vollhardt on the occasion of his 60th birthday.
Theory of pseudogap and superconductivity in doped Mott insulators†
Article first published online: 13 SEP 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Annalen der Physik
Special Issue: Special Topic Issue “Electronic Correlations in Models and Materials”
Volume 523, Issue 8-9, pages 629–637, August 2011
How to Cite
Imada, M., Yamaji, Y., Sakai, S. and Motome, Y. (2011), Theory of pseudogap and superconductivity in doped Mott insulators. Ann. Phys., 523: 629–637. doi: 10.1002/andp.201100028
- Issue published online: 13 SEP 2011
- Article first published online: 13 SEP 2011
- Manuscript Accepted: 23 MAR 2011
- Manuscript Revised: 16 MAR 2011
- Manuscript Received: 13 FEB 2011
- high-Tc superconductivity;
- dynamical mean-field theory.
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.