All-optical depletion of dark excitons from a semiconductor quantum dot

作者：Schmidgall E R^*; Schwartz I; Cogan D; Gantz L; Heindel T; Reitzenstein S; Gershoni D

来源：Applied Physics Letters, 2015, 106(19): 193101.

DOI：10.1063/1.4921000

Semiconductor quantum dots are considered to be the leading venue for fabricating on-demand sources of single photons. However, the generation of long-lived dark excitons imposes significant limits on the efficiency of these sources. We demonstrate a technique that optically pumps the dark exciton population and converts it to a bright exciton population, using intermediate excited biexciton states. We show experimentally that our method considerably reduces the dark exciton population while doubling the triggered bright exciton emission, approaching thereby near-unit fidelity of quantum dot depletion.

• 出版日期2015-5-11