Normal transmission of phonons with anomalous dispersion through the interface of two continuous media


  • I.N. Adamenko V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
  • K.E. Nemchenko V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
  • I.V. Tanatarov Akhiezer Institute for Theoretical Physics National Science Center "Kharkov Institute of Physics and Technology" of the National Academy of Sciences of Ukraine 1 Academicheskaya Str., Kharkov 61108, Ukraine


Ключові слова:

superfluidity, quasiparticles, dispersion, interface


In this work the problem is solved of normal transmission of quasiparticles through the interface of two continuous media, one of which is quantum fluid. The quantum fluid is described as a continuous medium with correlations. Within the framework of this approach the dispersion relation of the quantum fluid W(k) can be arbitrary. The integral equation describing it in a half-space is solved by the Wiener–Hopf method, and its general solution is obtained. This approach is applied to the dispersion relation of the Bose–Einstein condensate. It is shown that the solutions of equations of quantum fluid in a half-space are traveling waves deformed near the border by specific surface standing waves. By means of boundary conditions the general solution in the whole space is obtained. Expressions for transmission and reflection factors of waves in both directions are derived, depending on their frequency. The results are important for describing the creation of helium II phonons on the boundary with a solid, and are of interest for classical acoustics.


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Як цитувати

Adamenko, I.; Nemchenko, K.; Tanatarov, I. Normal Transmission of Phonons With Anomalous Dispersion through the Interface of Two Continuous Media. Fiz. Nyzk. Temp. 2006, 32, 255-268.



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