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

Two-dimensional superconductors and electron-hole superfluids in van derWaals heterostructures having tunable valence and conduction bands in theelectronic spectrum are emerging as rich platforms to investigate novel quantumphases and topological phase transitions. In this work, by adopting amean-field approach considering multiple-channel pairings and theKosterlitz-Nelson criterion, we demonstrate giant amplifications of theBerezinskii-Kosterlitz-Thouless (BKT) transition temperature and a shrinking ofthe pseudogap for small energy separations between the conduction and valencebands and small density of carriers in the conduction band. The presence of theholes in the valence band, generated by intra-band and pair-exchange couplings,contributes constructively to the phase stiffness of the total system, addingup to the phase stiffness of the conduction band electrons that is boosted aswell, due to the presence of the valence band electrons. This strongcooperative effect avoids the suppression of the BKT transition temperature forlow density of carriers, that occurs in single-band superconductors where onlythe conduction band is present. Thus, we predict that in this regime,multi-band superconducting and superfluid systems with valence and conductionbands can exhibit much larger BKT critical temperatures with respect tosingle-band and single-condensate systems.

Giant amplification of Berezinskii-Kosterlitz-Thouless transition  temperature in superconducting systems characterized by cooperative interplay  of small-gapped valence and conduction bands