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

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 i...

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Bibliographic Details
Published in:Journal of low temperature physics 2017-06, Vol.187 (5-6), p.390-397
Main Authors: Ferré, G., Rota, R., Boronat, J.
Format: Article
Language:English
Subjects:
Elementary excitations
Excitation spectra
Fluids
Low temperature physics
Monte Carlo simulation
Phase transitions
Superfluidity
Transition temperature
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Summary: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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-016-1679-5