Hidden Fermionic Excitation Boosting High-Temperature Superconductivity in Cuprates

Shiro Sakai, Marcello Civelli, Masatoshi Imada

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


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.

Original languageEnglish
Article number057003
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 2016 Feb 5
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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