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

28 Jul 2016  ·  Ferré G., Rota R., Boronat J. ·

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. read more

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