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Sub–single-exciton lasing using charged quantum dots coupled to a distributed feedback cavity

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Science  16 Aug 2019:
Vol. 365, Issue 6454, pp. 672-675
DOI: 10.1126/science.aax3489

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Switching on quantum dot lasers

The optical properties of quantum dots can be tailored with alterations to their size and composition. Developing quantum dots as low-threshold laser sources requires overcoming problems associated with carrier recombination and stability. Kozlov et al. report success in this direction by demonstrating that a mix of processing and postsynthesis charging can overcome these problems. Synthesis of compositionally graded core-shell quantum dots followed by a carrier charging step provides stable, low-threshold lasing.

Science, this issue p. 672

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