Dynamic structure factor for 3He in two-dimensions
M. Nava, D.E. Galli, S. Moroni, E. Vitali
TL;DR
This paper presents a quantum Monte Carlo approach to analyze excitations in 2D 3He films, successfully reproducing experimental zero-sound mode observations and their dispersion relations.
Contribution
It introduces a practical quantum Monte Carlo scheme for calculating correlation functions and an efficient analytic continuation method for fermionic systems.
Findings
Accurately reproduces zero-sound mode dispersion in 3He films
Provides a convincing theoretical description matching neutron scattering data
Demonstrates effectiveness of the proposed computational scheme
Abstract
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.
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