A Fröhlich-type Hamiltonian is derived for third sound and 3He quasi particles in phase-separated double layer of superfluid 4He and normal 3He liquid. It is stressed that our system is unique and valuable in that characteristic parameters can be varied in a wide range, simply by adjusting the film thickness. The effect of fermion-boson coupling on the velocity and damping of the third sound is examined. It is predicted that a rather drastic change in the third sound spectrum will occur when the Fermi velocity of 3He system and the third sound velocity are nearly the same. It is pointed out that the system under consideration may show a variety of interesting phenomena, in addition to the softening of the third sound.
|ジャーナル||Journal of the Physical Society of Japan|
|出版ステータス||Published - 1982 12|
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