Dynamic structure factor for3He in two dimensions

M. Nava, D. E. Galli, S. Moroni, E. Vitali
2013 Physical Review B  
Recent neutron scattering experiments on 3He films have observed a zero-sound mode, its dispersion relation and its merging with -and possibly emerging from- the particle-hole continuum. Here we address the study of the excitations in the system via quantum Monte Carlo methods: we suggest a practical scheme to calculate imaginary time correlation functions for moderate-size fermionic systems. Combined with an efficient method for analytic continuation, this scheme affords an extremely convincing description of the experimental findings.
doi:10.1103/physrevb.87.144506 fatcat:gqpuwbmbuvf4ffstjpejbm7sca