A new ripplon branch in He II

Автор(и)

  • I.V. Tanatarov National Science Center "Kharkov Institute of Physics and Technology" 1 Academicheskaya St., Kharkov 61108, Ukraine
  • I.N. Adamenko V. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
  • K.E. Nemchenko V. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
  • A.F.G. Wyatt School of Physics, University of Exeter, Exeter EX4 4QL, UK

DOI:

https://doi.org/10.1063/1.3479212

Ключові слова:

superfluid, helium, ripplon, roton, dispersion.

Анотація

We analyse the dispersion relation of ripplons, on the surface of superfluid helium, using the dispersive hydrodynamics approach and find a new ripplon branch. We obtain analytical equation for the dispersion relation and analytic expressions for the limiting cases. The probabilities of decay of unstable ripplons above the roton gap into rotons are derived. A numerical solution for the ripplon dispersion curve is obtained. The new ripplon branch is found at energies just below the instability point of the bulk spectrum, and is investigated; its stability is discussed.

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Опубліковано

2010-05-17

Як цитувати

(1)
Tanatarov, I.; Adamenko, I.; Nemchenko, K.; Wyatt, A. A New Ripplon Branch in He II. Fiz. Nizk. Temp. 2010, 36, 731-739.

Номер

Том 36 № 7 (2010)

Розділ

Квантові рідини та квантові кристали