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1991•Modern Physics Letters BRequires access

SINGLE-PARTICLE EXCITATIONS IN SUPERFLUID HELIUM

V. I. Yukalov

Open publisher page 6 citations

Abstract

We show theoretically that the collective spectrum of a Bose liquid contains, besides the well-known phonon-roton branch, single-particle excitations existing below the roton-stability boundary k r , but above a threshold kt. The existence of these single-particle excitations is not an experimental artifact as has been supposed earlier. Calculations made for superfluid helium give the threshold momentum k t ≅1 Å−1. This value and the attenuation found of the single-particle excitations are in very good agreement with experimental data.

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What this paper is about

We show theoretically that the collective spectrum of a Bose liquid contains, besides the well-known phonon-roton branch, single-particle excitations existing below the roton-stability boundary k r , but above a threshold kt. The existence of these single-particle excitations is not an experimental artifact as has been supposed earlier. Calculations made for superfluid helium give the threshold momentum k t ≅1 Å−1. This value and the attenuation found of the single-particle excitations are in very good agreement with experimental data.

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Available abstract

We show theoretically that the collective spectrum of a Bose liquid contains, besides the well-known phonon-roton branch, single-particle excitations existing below the roton-stability boundary k r , but above a threshold kt. The existence of these single-particle excitations is not an experimental artifact as has been supposed earlier. Calculations made for superfluid helium give the threshold momentum k t ≅1 Å−1. This value and the attenuation found of the single-particle excitations are in very good agreement with experimental data.

Key concepts: Roton, Superfluid helium-4, Physics, Superfluidity, Helium-4, Momentum (technical analysis), Particle (ecology), Quasiparticle

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