Roton-Phonon Interactions in Superfluid He4

B. Fåk, T. Keller, M. E. Zhitomirsky, and A. L. Chernyshev
Phys. Rev. Lett. 109, 155305 – Published 10 October 2012

Abstract

High-resolution neutron resonance spin-echo measurements of superfluid He4 show that the roton energy does not have the same temperature dependence as the inverse lifetime. Diagrammatic analysis attributes this to the interaction of rotons with thermally excited phonons via both four- and three-particle processes, the latter being allowed by the broken gauge symmetry of the Bose-condensate. The distinct temperature dependence of the roton energy at low temperatures suggests that the net roton-phonon interaction is repulsive.

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  • Received 6 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.155305

© 2012 American Physical Society

Authors & Affiliations

B. Fåk1, T. Keller2,3, M. E. Zhitomirsky1, and A. L. Chernyshev4

  • 1SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, F-38054 Grenoble, France
  • 2Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
  • 3FRM-II, TU München, Lichtenbergstraße 1, D-85747 Garching, Germany
  • 4Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

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Issue

Vol. 109, Iss. 15 — 12 October 2012

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