Momentum distribution of liquid 4He across the normal-superfluid phase transition

Abstract

We have carried out a study of the momentum distribution and of the spectrum of elementary excitations of liquid ${}^4$He across the normal-superfluid transition temperature, using the path integral Monte Carlo method. Our results for the momentum distribution in the superfluid regime show that a kink is present in the range of momenta corresponding to the roton excitation. This effect disappears when crossing the transition temperature to the normal fluid, in a behavior currently unexplained by theory.

8 pages, special issue QFS2016

References in corpus (4)

• Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
• Dynamic structure factor of liquid 4He across the normal-superfluid transition
• Superfluid 4He dynamics beyond quasiparticle excitations
• Condensate fraction in liquid 4He at zero temperature