THESIS
2021
1 online resource (xii, 43 pages) color illustrations
Abstract
A heterostructure with the ferromagnetic insulator (FI) and topological insulator (TI) is
promising to break the time-reversal symmetry (TRS) of TI by the magnetic proximity
effect. The exotic quantum phenomena are possible to be observed. In this thesis, the
transport properties of FI/TI heterostructures CrBr
3/Bi
2Se
3 are investigated. In contrast,
the transport properties of the control sample Bi
2Se
3 are measured. The anomalous Hall
effect (AHE) and the suppression of weak antilocalization effect are observed in the
heterostructure suggesting the TRS is broken in the heterostructure system. On the other
hand, the AHE cannot be observed in the control sample Bi
2Se
3 and the heterostructure
with the large thickness of Bi
2Se
3. The results suggest that two requirements should be
fulfilled i...[
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A heterostructure with the ferromagnetic insulator (FI) and topological insulator (TI) is
promising to break the time-reversal symmetry (TRS) of TI by the magnetic proximity
effect. The exotic quantum phenomena are possible to be observed. In this thesis, the
transport properties of FI/TI heterostructures CrBr
3/Bi
2Se
3 are investigated. In contrast,
the transport properties of the control sample Bi
2Se
3 are measured. The anomalous Hall
effect (AHE) and the suppression of weak antilocalization effect are observed in the
heterostructure suggesting the TRS is broken in the heterostructure system. On the other
hand, the AHE cannot be observed in the control sample Bi
2Se
3 and the heterostructure
with the large thickness of Bi
2Se
3. The results suggest that two requirements should be
fulfilled in order to realize the anomalous Hall effect. First, the CrBr
3 layer should be present to induce magnetism on TI. Second, the thickness of TI should be below 20 nm to reduce the bulk contribution.
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