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Title: Ultrafast dynamics of single quantum dots
Author: Brash, Alistair
ISNI:       0000 0004 6058 5725
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2016
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In this thesis the results of experiments on the optical properties of single InGaAs quantum dots are presented. Using a range of ultrafast spectroscopy techniques the dynamics of single charge carriers confined within these quantum dots are probed. Both the coherent and incoherent driving regimes are explored with a view to applications for quantum information processing. Three key results are described in detail in this thesis. Firstly, by performing resonant coherent driving it is shown that reduction of the quantum dot neutral exciton fine-structure splitting enables fast and high-fidelity initialization of long-lived hole spin quantum bits. Secondly, by detuning the laser from the ground state - neutral exciton transition it is possible to both excite and de-excite exciton population through incoherent driving via the acoustic phonon bath. Finally, by considering quantum dots coupled to optical microcavities it is shown that the driving strength of both resonant coherent and quasi-resonant phonon-assisted excitation may be strongly modulated.
Supervisor: Fox, A. M. ; Skolnick, M. S. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available