(Downloads - 0)
For more info about our services contact : help@bestpfe.com
Table of contents
1 Introduction
1.1 Historical background
1.2 Semiconductor quantum dots
1.3 Quantum dot structural properties
1.4 QD electronic states: a simplifled description
1.5 Excitonne structure of actual quantum dots
1.6 Polarization correlation in the \biexciton cascade
1.7 QD-based source of entangled photons
1.8 Expression of the anisotropic exchange term
1.9 Aim of this work
2 Samples and Experimental setups
2.1 Samples
2.1.1 II-VI samples
2.1.2 III-V samples
2.2 Technology
2.2.1 Devices for in-plane electric field
2.2.2 Devices for vertical electric field
2.3 Experimental setups
2.3.1 Setup for measurements of II-VI materials
2.3.2 Setup for measurements of III-V materials
3 Influence of electric field on quantum dots
3.1 In-plane electric field
3.1.1 PL intensity and linewidth
3.1.2 Fine structure splitting vs. in-plane field
3.2 Vertical electric field
3.2.1 Permanent vertical dipole
3.2.2 Direct Coulomb integrals
3.2.3 Fine structure splitting vs. vertical field
3.3 Local electric field
3.3.1 Transition identification
3.3.2 Fine structure vs. local field
3.4 Conclusion { FSS tuning
4 In°uence of magnetic field on quantum dots
4.1 Exciton Zeeman Hamiltonian
4.2 Faraday configuration
4.3 Voigt configuration
4.3.1 Theoretical model
4.3.2 Isotropic hole g factor (¯ = 0)
4.3.3 Anisotropic g factor (¯ 6= 0)
4.4 Experimental results
4.5 Orbital effects
4.6 Conclusions – FSS manipulation
4.7 Nuclear field
5 Toward Entanglement
5.1 Exciton spin dynamics in density matrix formalism
5.1.1 Time evolution of the exciton density matrix
5.1.2 Geometrical representation of spin precession
5.1.3 Polarization relaxation and conversion in cw experiments
5.2 Optical orientation/alignment of exciton
5.2.1 Optical orientation in QDs with tunable FSS
5.2.2 Optical orientation for different excitations
5.3 Measurements of polarization conversion
5.3.1 Circular-to-linear conversion
5.3.2 Linear-to-circular conversion
5.3.3 Conversion of polarization for trions
5.4 Conclusion
6 Conclusions
