Abstract
We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. “Dispersionlessmodes” that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H. Wiechert, Excitations in 4 He films, in “Proceedings of the Second International Conference on Phonon Physics,” World Scientific, 1985) are interpreted as standing waves or resonances of the helium liquid perpendicular to the substrate. Our interpretation is supported by microscopic calculations of the 4He dynamic structure function.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
H. J. Lauter, H. Godfrin, and H. Wiechert, in Proceedings of the Second International Conference on Phonon Physics, J. Kollàr, N. Kroo, M. Meynhard, and T. Siklos (eds.), World Scientific, Singapore (1985), p. 842.
H. J. Lauter, H. Godfrin, V. L. P. Frank, and P. Leiderer, Excitations in two-dimensional and three-dimensional quantum fluids, in NATO Advanced Study Institute, Series B: Physics, Vol. 257, A. F. G. Wyatt and H. J. Lauter (eds.), Plenum, New York (1991), pp. 419-427.
H. J. Lauter, H. Godfrin, and P. Leiderer, J. Low Temp. Phys. 87, 425 (1992).
H. J. Lauter, H. Godfrin, V. L. P. Frank, and P. Leiderer, Phys. Rev. Lett. 68, 2484 (1992).
B. E. Clements, E. Krotscheck, and C. J. Tymczak, Phys. Rev. B 53, 12253 (1996).
B. E. Clements et al., Phys. Rev. B 53, 12242 (1996).
B. E. Clements, J. L. Epstein, E. Krotscheck, and M. Saarela, Phys. Rev. B 48, 7450 (1993).
R. A. Aziz et al., J. Chem. Phys. 70, 4330 (1979).
P. Kramer and M. Saraceno, Geometry of the time-dependent variational principle in quantum mechanics, in Lecture Notes in Physics, Vol. 140, Springer, Berlin/Heidelberg/New York (1981).
A. K. Kerman and S. E. Koonin, Ann. Phys. (NY) 100, 332 (1976).
B. E. Clements et al., Phys. Rev. B 50, 6958 (1994).
M. Saarela, Phys. Rev. B 33, 4596 (1986).
M. Saarela and J. Suominen, in Condensed Matter Theories, J. S. Arponen, R. F. Bishop, and M. Manninen (eds.), Plenum, New York (1988), Vol. 3, pp. 157-165.
J. Suominen and M. Saarela, in Condensed Matter Theories, J. Keller (ed.), Plenum, New York (1989), Vol. 4, p. 377.
R. P. Feynman, Phys. Rev. 94, 262 (1954).
C. C. Chang and M. Cohen, Phys. Rev. A 8, 1930 (1973).
B. Fåk, O. Plantevin, and H. R. Glyde, Journal de Physique IV 10, 163 (2000).
M. Saarela, private communication (2000).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Apaja, V., Godfrin, H., Krotscheck, E. et al. An Interpretation of Dispersionless Modes in Neutron Diffraction Experiments on Helium Films. Journal of Low Temperature Physics 124, 599–607 (2001). https://doi.org/10.1023/A:1012226013904
Issue Date:
DOI: https://doi.org/10.1023/A:1012226013904