Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids

1. Front Matter

   Pages i-x

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2. Excitations in Liquid 4He

   • Henry R. Clyde

   Pages 1-13

3. Excitations in Superfluid 4He and the Dielectric Formalism

   • Allan Griffin

   Pages 15-23

4. Recent High-Resolution Neutron Scattering Studies of Liquid 4He

   • W. G. Stirling

   Pages 25-46

5. Momentum Distributions in Liquid Helium

   • P. E. Sokol, W. M. Snow

   Pages 47-58

6. S(Q,ω) for Liquid ⁴He: What More do We Need to Know?

   • E. C. Svensson

   Pages 59-76

7. Raman Scattering from Superfluid Helium

   • Kohji Ohbayashi

   Pages 77-89

8. Interpretation of Inelastic Light Scattering Measurements in 4He

   • J. W. Halley, M. S. Korth

   Pages 91-102

9. Discussion on Excitations in Bulk 4He

   • J. W. Halley, W. G. Stirling

   Pages 103-106

10. Excitations in Liquid Helium at Negative Pressures

    • Humphrey J. Maris

    Pages 107-117

11. Neutron Spin Echo Observation of Spontaneous Phonon Decay in Superfluid 4He

    • F. Mezei, C. Lartigue, B. Farago

    Pages 119-120

12. Dynamics of Rotons

    • David C. Samuels, Russell J. Donnelly

    Pages 121-130

13. Spectroscopic Study of Scattering of UCN by Liquid He4

    • E. Gutsmiedl, R. Golub, J. Butterworth

    Pages 131-135

14. Roton-Roton Scattering

    • A. F. G. Wyatt, A. C. Forbes

    Pages 137-147

15. Theory of Roton-Roton Scattering

    • Fumiaki Iwamoto

    Pages 149-157

16. Theory of the Phonon-Roton Spectrum of Liquid 4He

    • C. E. Campbell

    Pages 159-171

17. Towards a Unified Description of Bulk Excitations and the Two Fluid Theory of Superfluids in Terms of a Single Classical Equation of Motion

    • S. Putterman, P. H. Roberts, C. A. Jones, A. Larraza

    Pages 173-177

18. Disscussion on Bulk 4He Dynamics

    • R. J. Donnelly, S. Stringari

    Pages 179-181

19. Bulk Properties of 3He-4He Mixtures

    • R. M. Bowley

    Pages 183-194

20. Transport Properties of Very Dilute Superfluid Mixtures of 3He in 4He

    • H. Meyer, J. Tuttle, F. Zhong

    Pages 195-203

The study of quantum fluids in three dimensions has been an important area for many years as it embraces Bose-Einstein condensation, superfluidity and macroscopic quantisation. These are fundamental aspects of physics which can be studied in liquid 4He. In contrast, quantum fluids in two dimension is more recent and less developed. Nevertheless it has shown many interesting phenomena including a rich variety of phases and the Kosterlitz-Thouless transition. Intermediate between these dimensions are the restricted geometries of micro porous materials into which He may be introduced. The main quantum materials considered are 4He, 3He, D2, H2, H and electrons on the surface of 4He. The superfluid phases of 3He were excluded, e~cept for superfluid film flow, as 3He involves a separate set of problems. These proceedings arise from a lively Advanced Research Workshop on Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids held in Exeter 10-15 August 1990. Fifty scientists took part and each provided a written contribution. Perhaps it is a testimony to the discussions that several papers were revised by the authors after the meeting. The order of the chapters is the same as the presentations at the workshop. This arrangement starts with 4He in three dimensions which establishes a base from which the two dimensional properties can be viewed. At the end of each section there is a report on the discussion session. These are interesting and useful chapters as they clarify points made in the papers and define the boundary of current understanding.

• Counter
• Graphit
• Phase
• cluster
• electrons
• magnetism
• quantum system
• scattering
• transmission

• University of Exeter, Exeter, UK

  A. F. G. Wyatt

• Institute Laue Langevin, Grenoble, France

  H. J. Lauter

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