ABSTRACT
A single photo-pumped quantum dot (QD) at low temperature may show sub-angstrom linewidth from enhanced spontaneous emissions[l], while electro-pumped QD lasers so far reported are actually ‘multiple quantum dots’ medium lasers and mostly result in rather broad linewidths and large injection currents. [2] The conventional quantum wire (QWR) lasers also seem to have similar drawbacks of relatively large thresholds, broad linewidths, and substantial temperature-dependent spectral shifts. [3] Furthermore, low-dimensional device fabrications of semiconductor QDs and QWRs for lasers seem to be approaching to nature’s limitations such as statistical size, site and orientation fluctuations.
