Valence intersubband gain without population inversion

Mauro Pereira 1
  • 1 Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, S1 1WB, Sheffield, UK

Abstract

Terahertz gain without population inversion is studied in thin III–V semiconductor quantum wells. Nonequilibrium hole populations leading to intervalence gain in the transverse electric mode are investigated. The results are obtained with a Keldysh Nonequilibrium Green’s Functions approach that takes into account bandstructure, manybody and nonequilibrium effects.

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