Quantum transport in magnetic topological insulators
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This thesis is focused on the study of carrier transport behaviour in magnetically doped topological insulator (TI) materials. Magnetic TIs have been predicted to possess many exotic properties, such as the quantum anomalous Hall (QAH) effect, in which the edge states propagate adiabatically, similar to the quantum Hall effect, but without the need of an external magnetic field. In addition to the potential of being used for low-dissipation power transmission and for metrology as a resistance standard, the QAH effect also allows the exploration of a variety of new physics. However, it has been observed that dissipation mechanisms, which theoretically should be absent in the QAH effect, still exist in real measurements and impede the application of the QAH effect on further studies. Thus, this thesis presents the experiments designed to investigate the nature of dissipation in the QAH effect and discusses the possible ways to improve the QAH effect for future experiments.
The first part of the thesis introduces the study of the magnetic and electric properties of V-doped (Bi,Sb)
The second part of the thesis is dedicated to the study of transport properties of a Cr-doped (Bi,Sb)