Lattice Dynamics of Quantum Gases Adsorbed on Graphite Investigated by Inelastic Neutron Scattering

  • V. L. P. Frank
  • H. J. Lauter
  • H. Godfrin
  • P. Leiderer
Part of the NATO ASI Series book series (NSSB, volume 257)


During the last decade, substantial progress in the knowledge of the properties of two-dimensional (2D) matter has been achieved thanks to studies realized on monolayers of gases adsorbed on well characterized substrates like graphite. The existence of two relevant length scales in this problem, the adsorbate-adsorbate equilibrium distance and the separation between adsorption sites, leads to a rich phase diagram, where commensurate (C) and incommensurate (IC) structures can be present1,2. In a commensurate phase, the lack of translational invariance produces an energy gap (Δ) at the zone center in the acoustic branch of the phonon dispersion relation. The magnitude of this gap at low temperatures is related to the lateral variation of the adsorption potential, the so called corrugation. In an incommensurate phase, on the other hand, the translational invariance has been recovered and the phonon branches go to zero frequency at the zone center.


Domain Wall Hydrogen Isotope Inelastic Neutron Adsorption Potential Reciprocal Lattice Vector 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • V. L. P. Frank
    • 1
    • 2
  • H. J. Lauter
    • 1
  • H. Godfrin
    • 1
  • P. Leiderer
    • 2
  1. 1.Institute Laue-LangevinGrenobleFrance
  2. 2.University of KonstanzKonstanz 1West Germany

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