Phonons, rotons and ripplons at interfaces
We use dispersive hydrodynamics to describe thermal excitations of superfluid helium 4. Dispersion relation of the bulk quasiparticles, phonons and rotons, acts as an input parameter of the theory. Wiener and Hopf method is used to solve nonlocal equations of the fluid in half-space. The dispersion...
Saved in:
| Date: | 2012 |
|---|---|
| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Published: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2012
|
| Series: | Вопросы атомной науки и техники |
| Subjects: | |
| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/107153 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Phonons, rotons and ripplons at interfaces / I.V. Tanatarov, I.N. Adamenko, K.E. Nemchenko, A.F.G. Wyatt // Вопросы атомной науки и техники. — 2012. — № 1. — С. 260-264. — Бібліогр.: 9 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | We use dispersive hydrodynamics to describe thermal excitations of superfluid helium 4. Dispersion relation of the bulk quasiparticles, phonons and rotons, acts as an input parameter of the theory. Wiener and Hopf method is used to solve nonlocal equations of the fluid in half-space. The dispersion relation helium surface excitations, ripplons, is derived and analyzed; numerical solution reveals its new unusual branch. The same method applies to the description of bulk quasiparticles’ interaction with the interface with a solid. All quasiparticles creation probabilities are derived and weak interaction of rotons with negative dispersion with interfaces is explained. |
|---|