Abstract
New results of quantum coherence and interference effects in linear and nonlinear optical responses in double quantum wells are presented. Three-subband model in which two upper tunneling-split subbands are coupled by a dc-field is studied. We show the importance of the dc-field in establishing the quantum coherence and interference which introduces into the lasing without inversion and enhances the optical nonlinearity in the system. The optimal threshold dc-field can achieve as low as 4 kV/cm in our model. The Coulomb renormalization of electron kinetic energy is included. The many-body theory is employed to calculate both the linear and nonlinear optical responses.
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