Date of Award
Master of Science
Time-Reversal Symmetry (TRS) is a hallmark of Topological Insulator (TI) systems. TRS in conjuction with the strong Spin-Orbit Coupling (SOC) present in Bismuth Selenide is responsible for the uniquely robust surface states shown in this material. Breaking TRS in these systems in order to achieve gapped surface states requires the presence of a magnetic eld throughout the material. We achieve this eect by doping the system with 4f elements whereby the magnetic eld is provided by the local magnetic moments of the dopants manifesting ferromagnetic behavior. Through this spontaneous gap opening in the surface states in is expected that the Quantum Anomalous Hall Eect is present in the system. This thesis provides experimental evidence of good candidate materials for measuring the Quantum Anomalous Hall Eect. By combining X-ray Diraction to ensure good crystal growth, Angle-resolved Photoemission Spectroscopy probe to the evolution of the bandstructure as an eect of doping and Density Functional Theory to support the experimental data it is shown in this work that Samarium doped Bismuth Selenide is a prime candidate for displaying the Quantum Anomalous Hall Eect. Acknowledgements
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