Breathing kagome XY quantum magnet with four-site ring exchange

We study the impact of trimerization (breathing) nearest-neighbor (NN) exchange on planar XY spin-1/2 ferromagnet kagome lattice, including additional four-site ring exchange. For uniform NN exchange, this model has previously been shown to transit from a long-range ordered into Z2 quantum spin liquid by virtue Using Monte-Carlo calculations, based stochastic series expansion, we present results for stiffness, phase diagram, longitudinal static, as well transverse dynamic structure factor. Our corroborate 3D universality also at finite and suggest simple continuation critical point case line in terms rescaled parameters. Moreover, any elementary excitations can be understood very linear wave theory, while beyond line, find signatures spinon continua.