Friday, February 8, 2013

1302.1799 (M. Nava et al.)

Zero-sound mode in a neutral Fermi liquid: dynamic fermionic
correlations applied to two-dimensional 3He

M. Nava, D. E. Galli, S. Moroni, E. Vitali
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. We develop a practical quantum Monte Carlo 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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