Recent ATLAS measurements of correlations in Pb+Pb and Xe+Xe collisions

ATLAS measurements of flow harmonics, \vn, and their fluctuations in Pb+Pb and Xe+Xe collisions at the Large Hadron Collider (LHC), covering a wide range of transverse momenta, pseudorapidity and collision centrality, are presented. The measurements are performed using data from Xe+Xe collisions at 5.44 TeV and Pb+Pb collisions at 2.76 TeV and 5.02 TeV. The flow harmonics are measured using the two-particle correlations, multi-particle cumulants, and scalar product methods. Similar $p_{\rm T}$ and centrality dependence of \vn values is observed for both systems. A new universal scaling of harmonics of different orders leading to $p_{\rm T}$ and even centrality independence is described. Measurements of longitudinal flow decorrelations involving two- and four-particle correlations for $v_{2}$ and $v_{3}$ in Xe+Xe and Pb+Pb collisions are shortly mentioned. Some results for event-by-event correlations between harmonics of different orders, studied with three- and four-particle mixed-harmonic cumulants, are shown. Contributions to these correlations from ``centrality fluctuations'' are also discussed. Finally the measurement of elliptic and triangular flow of muons from charm and bottom hadron decays in 5.02 TeV Pb+Pb collisions is presented.