Beat-wave generation of plasmons in semiconductor plasmas
  It is shown that in semiconductor plasmas, it is possible to generate large amplitude plasma waves by the beating of two laser beams with frequency difference close to the plasma frequency. For narrow gap semiconductors (for example n-type InSb), the system can simulate the physics underlying beat wave generation in relativistic gaseous plasmas. 
V.I. Berezhiani and S.M. Mahajan