Reduced threshold current of a quantum dot laser in a short period superlattice of indirect-band gap

Sun, Gregory; Soref, Richard A.; Khurgin, Jacob B.
May 2004
Applied Physics Letters;5/10/2004, Vol. 84 Issue 19, p3861
Academic Journal
We propose the idea of making quantum dot lasers by embedding direct-band gap quantum dots in a short period superlattice whose band gap is indirect. This technique reduces the threshold current and its temperature dependence. We show that a higher characteristic-temperature T0 can be achieved in a quantum dot laser with indirect GaAs/AlAs superlattice barriers compared to that with direct GaAs barriers.


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