Present Trends in Collective Excitations in Solids

  • F. Williams
Part of the NATO Advanced Science Institute Series book series (NSSB, volume 88)


Excitations of solids are in general identified as collective because of the many-body interactions. Single particle descriptions are therefore approximations, and well-known quasi-particle excitations such as phonons, excitons and plasmons are themselves approximations. The exact many-body excitations are designated “collectons.” The formulation is further generalized to include probes, sources and applied stresses in interpreting phenomena. Examples include the polariton which results from coupling of the electromagnetic probe with transverse polarization in solids, atomic beams coupled to surface phonons, and solid bodies coupled to high pressure apparatus. General trends in research on collective excitation are reviewed, including extremal conditions for experiments, applied research and sophisticated formulations such as quantum field analyses. Finally, trends specific to particular classes of collective excitations are reviewed.


Solid Body Atomic Beam Collective Excitation Transverse Polarization Total Wave Function 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • F. Williams
    • 1
    • 2
  1. 1.Physics DepartmentUniversity of DelawareNewarkUSA
  2. 2.Institut für Festkorperphysik IITechnische UniversitätBerlin 12Germany

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