Journal of Low Temperature Physics

, Volume 187, Issue 5–6, pp 390–397 | Cite as

Momentum Distribution of Liquid \(^{4}\)He Across the Normal–Superfluid Phase Transition

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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.

Keywords

Superfluid helium Momentum distribution Quantum Monte Carlo 

Notes

Acknowledgments

We acknowledge partial financial support from the MICINN (Spain) Grant No. FIS2014-56257-C2-1-P.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Departament de FísicaUniversitat Politècnica de CatalunyaBarcelonaSpain
  2. 2.Laboratoire Matériaux et Phénomènes QuantiquesUniversité Paris Diderot, Sorbonne Paris Cité, CNRS-UMR7162ParisFrance

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