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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We show that in two-band $s$-wave superfluids it is possible to inducequantum phase transitions (QPTs) by tuning intraband and interband $s$-waveinteractions, in sharp contrast to single-band $s$-wave superfluids, where onlya crossover between Bardeen-Cooper-Schrieffer (BCS) and Bose-Einsteincondensation (BEC) superfluidity occurs. For non-zero interband and attractiveintraband interactions, we demonstrate that the ground state has always twointerpenetrating superfluids possessing three spectroscopically distinctregions where pairing is qualitatively different: (I) BCS pairing in both bands(BCS-BCS), (II) BCS pairing in one band and BEC pairing in the other (BCS-BEC),and (III) Bose pairing in both bands (BEC-BEC). Furthermore, we show that byfine tuning the interband interactions to zero one can induce QPTs in theground state between three distinct superfluid phases. There are two phaseswhere only one band is superfluid ($S_1$ or $S_2$), and one phase where bothbands are superfluid $(S_1 + S_2)$, a situation which is absent in one-band$s$-wave systems. Lastly, we suggest that these crossovers and QPTs may beobserved in $^{173}$Yb and $^{87}$Sr.

Crossovers and quantum phase transitions in two-band superfluids: The evolution from BCS to Bose pairing by tuning interactions and band offset