Abstract
The elementary excitations of a strongly interacting two-dimensional Fermi liquid have been investigated by inelastic neutron scattering in an experimental model system: a monolayer of liquid 3He adsorbed on graphite preplated by a monolayer of solid 4He. We observed for the first time the particle-hole excitations characterizing the Fermi liquid state of two-dimensional liquid 3He, and we were also able to identify the highly interesting zero-sound collective mode above a particle-hole band. Contrarily to bulk 3He, at low wave-vectors this mode lies very close to the particle-hole band. At intermediate wave-vectors, the collective mode enters the particle-hole band, where it is strongly broadened by Landau damping. At high wave-vectors, where the Landau theory is not applicable, the zero-sound collective mode reappears beyond the particle-hole band as a well defined excitation, with a dispersion relation quite similar to that of superfluid 4He. This spectacular effect is observed for the first time in a Fermi liquid (including plasmon excitations in electronic systems).
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References
P. Nozières, Liquides et Solides Quantiques, series of lectures given in Grenoble (1983), unpublished
D. Pines, P. Nozières, The Theory of Quantum Liquids (Benjamin, New York, 1966)
A.L. Fetter, J.D. Walecka, Quantum Theory of Many Particle Systems (McGraw-Hill, New York, 1971)
J. Wilks, Liquid and Solid Helium (Clarendon Press, Oxford, 1967)
D. Pines, Phys. Today 34, 106 (1981)
H.R. Glyde, Excitations in Liquid and Solid Helium (Clarendon Press, Oxford, 1994)
S.W. van Sciver, O.E. Vilches, Phys. Rev. B 18, 285 (1978)
D.S. Greywall, Phys. Rev. B 41, 1842 (1990)
H. Godfrin, H.J. Lauter, in Progress in Low Temp. Physics, vol. XIV, ed. by W.P. Halperin (Elsevier Science, Amsterdam, 1995), pp. 213–320. Chap. 4
H. Godfrin, R.E. Rapp, Adv. Phys. 44, 113 (1995)
K.D. Morhard, C. Bäuerle, J. Bossy, Y.M. Bunkov, S.N. Fisher, H. Godfrin, Phys. Rev. B 53, 2658 (1996)
A. Casey, H. Patel, J. Nyéki, B.P. Cowan, J. Saunders, Phys. Rev. Lett. 90, 115301 (2003)
E.R. Dobbs, Helium Three (Oxford University Press, London, 2001)
M. Neumann, J. Nyéki, B.P. Cowan, J. Saunders, Science 317, 1356 (2007)
R. Scherm, W.G. Stirling, A.D.B. Woods, R.A. Cowley, G.J. Coombs, J. Phys. C. Solid State Phys. 7, L341 (1974)
K. Sköld, C.A. Pelizzari, R. Kleb, G.E. Ostrowski, Phys. Rev. Lett. 37, 842 (1976)
R. Scherm, K. Glucksberger, B. Fak, K. Sköld, A.J. Dianoux, H. Godfrin, W.G. Stirling, Phys. Rev. Lett. 59, 217 (1987)
H.R. Glyde, B. Fak, N.H. van Dijk, H. Godfrin, K. Glucksberger, R. Scherm, Phys. Rev. B 61, 1421 (2000)
H. Godfrin, M. Meschke, H.J. Lauter, H.M. Böhm, E. Krotscheck, M. Panholzer, to be published
E.S. Hernandez, M.M. Calbi, J. Low Temp. Phys. 120, 1 (2000)
C.H. Aldrich, D. Pines, J. Low Temp. Phys. 32, 689 (1978)
H.W. Jackson, Phys. Rev. 185, 186 (1969)
C.C. Chang, C.E. Campbell, Phys. Rev. B 13, 3997 (1976)
H.M. Böhm, E. Krotscheck, M. Panholzer, H. Godfrin, H.J. Lauter, M. Meschke, J. Low Temp. Phys. (these proceedings)
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Godfrin, H., Meschke, M., Lauter, HJ. et al. Observation of Zero-Sound at Atomic Wave-Vectors in a Monolayer of Liquid 3He. J Low Temp Phys 158, 147–154 (2010). https://doi.org/10.1007/s10909-009-9952-5
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DOI: https://doi.org/10.1007/s10909-009-9952-5