Interactions between Sheets of Phonons in Liquid 4He
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2003-12-05
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Анотація
We have created two sheets of 1 K phonons in liquid 4He at 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 30 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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low-energy phonons, liquid 4He, phonon pulses