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We compute several ground state properties and the dynamical structure factorof a 0-temperature system of Bosons interacting with the 2D screened Coulomb(2D-SC) potential. We resort to the exact shadow path integral ground state(SPIGS) quantum Monte Carlo method to compute the imaginary-time correlationfunction of the model, and to the genetic algorithm via falsification oftheories (GIFT) to retrieve the dynamical structure factor. We provide adetailed comparison of ground state properties and collective excitations of2D-SC and 4He atoms. The roton energy of the 2D-SC system is an increasingfunction of density, and not a decreasing one as in 4He. This result is incontrast with the view that the roton is the soft mode of the fluid-solidtransition. We uncover a remarkable quasi-universality of backflow and of otherproperties when expressed in terms of the amount of short range order asquantified by the height of the first peak of the static structure factor.

Roton excitations and the fluid-solid phase transition in superfluid 2D Yukawa Bosons