Observation of dynamic atom-Atom correlation in liquid helium in real space

W. Dmowski; S. O. Diallo; K. Lokshin; G. Ehlers; G. Ferré; J. Boronat; T. Egami

doi:10.1038/ncomms15294

Observation of dynamic atom-Atom correlation in liquid helium in real space

W. Dmowski, S. O. Diallo, K. Lokshin, G. Ehlers, G. Ferré, J. Boronat, T. Egami

Neutron Technologies Division

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17 Scopus citations

Abstract

Liquid ⁴He becomes superfluid and flows without resistance below temperature 2.17 K. Superfluidity has been a subject of intense studies and notable advances were made in elucidating the phenomenon by experiment and theory. Nevertheless, details of the microscopic state, including dynamic atomatom correlations in the superfluid state, are not fully understood. Here using a technique of neutron dynamic pair-density function (DPDF) analysis we show that ⁴He atoms in the BoseEinstein condensate have environment significantly different from uncondensed atoms, with the interatomic distance larger than the average by about 10%, whereas the average structure changes little through the superfluid transition. DPDF peak not seen in the snap-shot pair-density function is found at 2.3 A, and is interpreted in terms of atomic tunnelling. The real space picture of dynamic atomatom correlations presented here reveal characteristics of atomic dynamics not recognized so far, compelling yet another look at the phenomenon.

Original language	English
Article number	15294
Journal	Nature Communications
Volume	8
DOIs	https://doi.org/10.1038/ncomms15294
State	Published - 2017

Bibliographical note

Publisher Copyright:
© The Author(s) 2017.

Funding

The authors are grateful to H.R. Glyde and J.J. Quinn for useful discussions. The work at the Oak Ridge National Laboratory and the University of Tennessee was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. G.F. and J.B. acknowledge financial support by MINECO (Spain) Grant No. FIS2014-56257-C2-1-P.

Funders	Funder number
Materials Science and Engineering Division
US Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
University of Tennessee
Ministerio de Economía y Competitividad	FIS2014-56257-C2-1-P

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abstract = "Liquid 4He becomes superfluid and flows without resistance below temperature 2.17 K. Superfluidity has been a subject of intense studies and notable advances were made in elucidating the phenomenon by experiment and theory. Nevertheless, details of the microscopic state, including dynamic atomatom correlations in the superfluid state, are not fully understood. Here using a technique of neutron dynamic pair-density function (DPDF) analysis we show that 4He atoms in the BoseEinstein condensate have environment significantly different from uncondensed atoms, with the interatomic distance larger than the average by about 10%, whereas the average structure changes little through the superfluid transition. DPDF peak not seen in the snap-shot pair-density function is found at 2.3 A, and is interpreted in terms of atomic tunnelling. The real space picture of dynamic atomatom correlations presented here reveal characteristics of atomic dynamics not recognized so far, compelling yet another look at the phenomenon.",

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AU - Dmowski, W.

AU - Diallo, S. O.

AU - Lokshin, K.

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AU - Ferré, G.

AU - Boronat, J.

AU - Egami, T.

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Observation of dynamic atom-Atom correlation in liquid helium in real space

Abstract

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