English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We scrutinize the real-frequency structure of the self-energy in thesuperconducting state of the attractive Hubbard model within the dynamicalmean-field theory. Within the strong-coupling superconducting phase which hasbeen understood in terms of the Bose-Einstein condensation in the literature,we find two qualitatively different regions crossing over each other. In oneregion close to zero temperature, the self-energy depends on the frequency onlyweakly at low energy. On the other hand, in the region close to the criticaltemperature, the self-energy shows a pole structure. The latter region becomesmore dominant as the interaction becomes stronger. We reveal that theself-energy pole in the latter region is generated by a coupling to a hiddenfermionic excitation. The hidden fermion persists in the normal state, where ityields a pseudogap. We compare these properties with those of the repulsiveHubbard model relevant for high-temperature cuprate superconductors, showingthat hidden fermions are a key common ingredient in strongly correlatedsuperconductivity.

Hidden fermionic excitation in the superconductivity of the strongly attractive Hubbard model