کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1554075 | 998768 | 2012 | 8 صفحه PDF | دانلود رایگان |
Optical pumping of a type-I/type-II coupled asymmetric quantum well pair induces a spatially separated two dimensional charge carriers plasma in the well’s wide and narrow parts. Treating the two coupled wells as a single system we find that the eigenstate probability distribution localizes exclusively either in the wide or the narrow parts of the well pair. The energy of the narrow-well localized state determines the minimal excitation energy for optically pumped charge carriers separation. In a previously used design [Guliamov et al., PRB 64 035314 (2001)] this narrow well transition energy was measured to correspond to a wavelength of 646 nm. We propose modifications to the design suggested earlier with the purpose of pushing up the energy required for the optical pumping of the two-dimensional plasma into the green and blue regions of the visible spectrum.
► A two mono-layers thin GaAs narrow well has an optical doping threshold below 500 nm.
► There are two optical pumping regimes depending on the excitation energy.
► Localized narrow-well eigenstate exhibits discrete quantum number jumps.
Journal: Superlattices and Microstructures - Volume 51, Issue 6, June 2012, Pages 834–841