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We consider a Bose-Josephson junction (BJJ) formed by a binary mixture ofultracold atoms to investigate the manifestation of coherent collectivedynamics on ergodicity and quantum scars, unfolding the connection betweenthem. By tuning the inter- and intra-species interaction, we demonstrate a richvariety of Josephson dynamics and transitions between them, which plays acrucial role in controlling the overall ergodic behavior. The signature ofunderlying classicality is revealed from the entanglement spectrum, which alsoelucidates the formation of quantum scars of unstable steady states and ofperiodic orbits leading to athermal behavior. The degree of ergodicity acrossthe energy band and scarring phenomena can be probed from the auto-correlationfunction as well from the phase fluctuation of the condensates, which hasrelevance in cold atom experiments.

Classical route to ergodicity and scarring phenomena in a two-component Bose-Josephson junction