Controlling the exciton energy of a nanowire quantum dot by strain fields
Yan Chen (IFW Dresden)
Iman Esmaeil Zadeh (TU Delft - QN/Zwiller Lab)
Klaus D. Jöns (TU Delft - QN/Quantum Nanoscience)
Andreas Fognini (TU Delft - QN/Zwiller Lab)
Michael E. Reimer (University of Waterloo)
Jiaxiang Zhang (IFW Dresden)
Dan Dalacu (National Research Council Canada)
Philip J. Poole (National Research Council Canada)
Fei Ding (IFW Dresden)
Val Zwiller (TU Delft - QN/Zwiller Lab)
Oliver G. Schmidt (Technische Universität Chemnitz, IFW Dresden)
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Abstract
We present an experimental route to engineer the exciton energies of single quantum dots in nanowires. By integrating the nanowires onto a piezoelectric crystal, we controllably apply strain fields to the nanowire quantum dots. Consequently, the exciton energy of a single quantum dot in the nanowire is shifted by several meVs without degrading its optical intensity and single-photon purity. Second-order autocorrelation measurements are performed at different strain fields on the same nanowire quantum dot. The suppressed multi-photon events at zero time delay clearly verify that the quantum nature of single-photon emission is well preserved under external strain fields. The work presented here could facilitate on-chip optical quantum information processing with the nanowire based single photon emitters.
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