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Article Dans Une Revue Journal of Physics: Conference Series Année : 2012

Two-dimensional Fermi liquids sustain surprising roton-like plasmons beyond the particle-hole band

Résumé

Using inelastic neutron scattering, we have investigated the elementary excitations of an isotropic two-dimensional Fermi liquid, 3He adsorbed on graphite. We provide in this article a detailed account of the principles and methods which allowed measuring for the first time inelastic spectra on a liquid monolayer of 3He, a strong neutron absorber. We also summarise the results presented at this Conference, and review our recent experimental and theoretical work on this this interacting many-body system. At low wave-vectors, near the edge of the particle-hole band, a mode identified as the zero-sound excitation by comparison to our theoretical calculations, is found as predicted at energies much lower than in bulk 3He. The mode enters the particle-hole band, where it undergoes Landau damping. Surprisingly, however, intensity is observed in the neutron spectra at wave-vectors larger than twice the Fermi wavevector. This new branch is interpreted as the high wave-vector continuation of the zero-sound mode, in agreement with the theory. The results open new perspectives in the understanding of the dynamics of correlated fermions.
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Dates et versions

hal-00920433 , version 1 (18-12-2013)

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Ahmad Sultan, Henri Godfrin, Matthias Meschke, Hans J. Lauter, Helmut Schober, et al.. Two-dimensional Fermi liquids sustain surprising roton-like plasmons beyond the particle-hole band. Journal of Physics: Conference Series, 2012, 340, pp.012078. ⟨10.1088/1742-6596/340/1/012078⟩. ⟨hal-00920433⟩

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