Excitons and Plasmons: Collective Excitations in Semiconductors

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


For a simple model consisting of a nondegenerate valence and conduction band, the spectrum of elementary excitations is calculated taking into account the Coulomb interaction between valence and conduction electrons. It contains, as collective excitations, excitons below and a valence plasmon above the continuum of single electron-hole pair excitations.

The importance of the so-called exchange interaction is pointed out as being responsible for the longitudinal-transverse-splitting of the excitonic solutions and for the existence of the plasmon. Using the equation of motion method not only the energy but also the wavefunction of the plasmonic solution is obtained.

Finally, the dielectric function of the model is derived and the exciton-polariton is discussed.


Dielectric Function Interband Transition Collective Excitation Elementary Excitation Polariton Branch 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • I. Egri
    • 1
  1. 1.Institut für Theoretische PhysikRWTH Aachen51 AachenGermany

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