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The Effect of Roton Backflow on Quantum Evaporation from Superfluid 4He

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Abstract

We investigate the effect of roton backflow on the scattering of atoms, rotons and phonons at the free surface of superfluid 4He at T=0 K by including backflow semi-phenomenologically in the form of a backflow potential in the theory of Sobnack et al. [M. B. Sobnack, J. C. Inkson, and J. C. H. Fung, Phys. Rev. B 60, 3465 (1999)]. We assume that all the surface scattering processes are elastic and that the quasiparticles and atoms are incident obliquely to the free surface. We calculate probabilities for the various one-to-one surface scattering processes allowed for a range of energies and compare the scattering rates with those obtained when backflow is neglected.

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Authors and Affiliations

  1. Department of Physics, Loughborough University, Loughborough, Leics, LE11 3TU, United Kingdom

    M. B. Sobnack

  2. School of Physics, University of Exeter, Exeter, EX4 4QL, United Kingdom

    J. R. Matthias

  3. Department of Mathematics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

    J. C. H. Fung

Authors
  1. M. B. Sobnack
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  2. J. R. Matthias
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  3. J. C. H. Fung
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Sobnack, M.B., Matthias, J.R. & Fung, J.C.H. The Effect of Roton Backflow on Quantum Evaporation from Superfluid 4He. Journal of Low Temperature Physics 121, 339–344 (2000). https://doi.org/10.1023/A:1017533209692

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  • DOI: https://doi.org/10.1023/A:1017533209692

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