Interactions between Sheets of Phonons in LiquidHe4 | Zendy

Р. В. Вовк | Zendy; C. D. H. Williams | Zendy; A. F. G. Wyatt | Zendy

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Interactions between Sheets of Phonons in LiquidHe4

Author(s) -

Р. В. Вовк,

C. D. H. Williams,

A. F. G. Wyatt

Publication year - 2003

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.91.235302

Subject(s) - phonon , energy (signal processing) , physics , line (geometry) , liquid helium , space (punctuation) , helium , atomic physics , condensed matter physics , geometry , computer science , quantum mechanics , mathematics , operating system

We have created two sheets of approximately 1 K phonons in liquid (4)He at approximately 55 mK such that they intersect each other as they move towards a common point. If the two sheets have a small angle between them, they interact strongly and create a hot line in the liquid helium. This line is continuously fed with energy from the two sheets and loses energy by creating high-energy phonons. If the angle between the sheets is larger than approximately 30 degrees they do not interact but pass through each other. These results give direct evidence for the composition of the sheets: they comprise strongly interacting low-energy phonons which occupy a narrow cone in momentum space.

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