Static density response of one-dimensional soft bosons across the clustering transition

M Teruzzi, D Pini, S Rossotti, D E Galli, G Bertaina
2018 Journal of Physics, Conference Series  
One-dimensional bosons interacting via a soft-shoulder potential are investigated at zero temperature. The flatness of the potential at short distances introduces a typical length, such that, at relatively high densities and sufficiently strong interactions, clusters are formed, even in the presence of a completely repulsive potential. We evaluate the static density response function of this system across the transition from the liquid to the cluster liquid phases. Such quantity reveals the
more » ... ity modulations induced by a weak periodic external potential, and is maximal at the clustering wavevector. It is known that this response function is proportional to the static structure factor in the classical regime at high temperature, while for this zero-temperature quantum systems, we extract it from the dynamical structure factor evaluated with quantum Monte Carlo methods.
doi:10.1088/1742-6596/1041/1/012009 fatcat:xvlpnmc67fegjofq56iehyymzy