Tuning the Exciton Binding Energies in Single Self-Assembled InGaAs/GaAs Quantum Dots by Piezoelectric-Induced Biaxial Stress

We study the effect of an external biaxial stress on the light emission of single InGaAs/GaAs(001) quantum dots placed onto piezoelectric actuators. With increasing compression, the emission blueshifts and the binding energies of the positive trion (X+) and biexciton (XX) relative to the neutral exciton (X) show a monotonic increase. This phenomenon is mainly ascribed to changes in electron and hole localization and it provides a robust method to achieve color coincidence in the emission of X and XX, which is a prerequisite for the possible generation of entangled photon pairs via the recently proposed "time reordering'' scheme.

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Made available in DSpace on 2010-04-21T16:45:37Z (GMT). No. of bitstreams: 1 Tuning the Exciton Binding Energies in Single Self-Assembled InGaAsGaAs Quantum Dots by Piezoelectric-Induced Biaxial Stress.pdf: 1153928 bytes, checksum: 9c0f8d5bb640a1240c8fecd704bd8cf6 (MD5) Previous issue date: 2010

DFG FOR730; BMBF 01BM459 ;NWO (VIDI) ; CAS-MPG; NSFC China 60625402

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DFG FOR730; BMBF 01BM459 ;NWO (VIDI) ; CAS-MPG; NSFC China 60625402