Phys. Rev. Lett. 102, 127404 (2009) [4 pages]Gain Control in Semiconductor Quantum Dots via State-Resolved Optical PumpingReceived 28 October 2008; published 24 March 2009 Excitonic state-resolved optical pumping experiments were performed on strongly confined semiconductor quantum dots. We demonstrate for the first time that optical gain is dependent upon the initial excitonic state. By prescribing the specific multiexcitonic states which can create, block, and ultimately control optical gain spectra, we recover the theoretically predicted size independence, even in systems which previously showed zero gain. In addition, we show for the first time that stimulated emission in quantum dots can be controlled via specific multiexcitonic interactions. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.127404
DOI:
10.1103/PhysRevLett.102.127404
PACS:
78.67.Hc, 73.21.La, 78.45.+h, 82.53.Mj
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