Hidden Fermionic Excitation Boosting High-Temperature Superconductivity in Cuprates

Shiro Sakai, Marcello Civelli, and Masatoshi Imada
Phys. Rev. Lett. 116, 057003 – Published 5 February 2016
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Abstract

The dynamics of a microscopic cuprate model, namely, the two-dimensional Hubbard model, is studied with a cluster extension of the dynamical mean-field theory. We find a nontrivial structure of the frequency-dependent self-energies, which describes an unprecedented interplay between the pseudogap and superconductivity. We show that these properties are well described by quasiparticles hybridizing with (hidden) fermionic excitations, emergent from the strong electronic correlations. The hidden fermion enhances superconductivity via a mechanism distinct from a conventional boson-mediated pairing, and originates the normal-state pseudogap. Though the hidden fermion is elusive in experiments, it can solve many experimental puzzles.

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  • Received 13 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.057003

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shiro Sakai1,2, Marcello Civelli3, and Masatoshi Imada1

  • 1Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 2Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
  • 3Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France

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Issue

Vol. 116, Iss. 5 — 5 February 2016

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