Optical pumping of charged excitons in unintentionally doped InAs quantum dots

Details Optical pumping of charged excitons in unintentionally doped InAs quantum dots Optical pumping of charged excitons in unintentionally doped InAs quantum dots

2007-04-18

arxiv.org/abs/0704.2319v1

Nanotechnology 19 (2008) 145711

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages and 3 figures submitted to APL

Scientific paper

10.1088/0957-4484/19/14/145711

As an alternative to commonly used electrical methods, we have investigated the optical pumping of charged exciton complexes addressing impurity related transitions with photons of the appropriate energy. Under these conditions, we demonstrate that the pumping fidelity can be very high while still maintaining a switching behavior between the different excitonic species. This mechanism has been investigated for single quantum dots of different size present in the same sample and compared with the direct injection of spectator electrons from nearby donors.

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