Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.560525
Title: Spin dynamics in semiconductor heterostructures
Author: English, David
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2012
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Abstract:
This thesis presents experimental investigations of the electron spin dynamics (i.e. the spin relaxation rate, This thesis presents experimental investigations of the electron spin dynamics(i.e. the spin relaxation rate, Γs, and the g-factor, g ∗ ) inGaAs/ AlGaAs based semiconductor heterostructures and the effect of symmetry breaking perturbations such as; an applied external electric field, shear strain or graded alloy composition in the barriers. Spin-polarised electron populations are generated and detected using optical methods. Quantum wells grown on a (001) zinc-blende substrate display isotropic inplane spin dynamics. The above perturbations act to lower the symmetry and therefore the spin dynamics are allowed to show in plane anisotropy. However, the microscopic origin of the anisotropy of Γs is different to that of g∗ . This thesis contains a full study of the anisotropy of both Γs and g∗ for all of the above perturbations. This reveals the microscopic effects on the band edges of the perturbations. It has previously been shown theoretically that strain applied in the plane of (110) or (111) oriented quantum wells can act to cancel the spin-orbit field from bulk inversion asymmetry. In this thesis, we study the effect on the spin dynamics of of strain applied to a (110) quantum well and also investigate a (111) sample for its suitability in such experiments.
Supervisor: Harley, Richard Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.560525  DOI: Not available
Keywords: QC Physics
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