Abstract
When the confinement in a quantum wire is such that the spacing between subbands is equal to the optic phonon energy ħωLO, a situation occurs in nonequilibrium conditions analogous to the longitudinal magnetophonon effect1 where due to phonon resonance and upper subband population is enhanced with respect to the lower subband. We focus our investigation on the case where a third intermediate subband is located slightly below the upper subband. For this particular configuration, when we apply an external longitudinal field a population inversion is obtained between the upper and intermediate subband.2
© 1989 Optical Society of America
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