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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study conditions for the emergence of the preformed Cooper pairs inmaterials hosting flat bands. As a particular example, we consider a semimetal,with a pair of three-band crossing points at which a flat band intersects witha Dirac cone, and focus on the s-wave intervalley pairing channel. The nearlydispersionless nature of the flat band at strong attraction between electronspromotes local Cooper pair formation so that the system may be modeled as anarray of superconducting grains. Due to dispersive bands, Andreev scatteringbetween the grains gives rise to the global phase-coherent superconductivity atlow temperatures. We develop a mean-field theory to calculate transitiontemperature between the preformed Cooper pair state and the phase-coherentstate for different interaction strengths in the Cooper channel. The transitiontemperature between semimetal and preformed Cooper pair phases is proportionalto the interaction constant, the dependence of the transition temperature tothe phase-coherent state on the interaction constant is weaker.

Preformed Cooper pairs in flat-band semimetals