Publications by authors named "Chi Ian Jess Ip"
Article Synopsis
- - The study focuses on the indirect exchange interaction between local magnetic moments and surface electrons in magnetic topological insulators (MTIs), which is essential for the quantum anomalous Hall effect and has implications for topotronic device temperatures.
- - Researchers utilized time-resolved photoemission spectroscopy and magneto-optical Kerr effect measurements on the intrinsic MTI MnBiTe to investigate surface electromagnetism, confirming the role of 2D interactions in surface magnetism dynamics.
- - Their findings reveal a notable exchange gap and residual magnetization in even-layer MnBiTe, highlighting the potential for effective light-induced demagnetization, which could advance control over magnetism in future topotronic applications.
Ultrathin topological insulator membranes are building blocks of exotic quantum matter. However, traditional epitaxy of these materials does not facilitate stacking in arbitrary orders, while mechanical exfoliation from bulk crystals is also challenging due to the non-negligible interlayer coupling therein. Here we liberate millimeter-scale films of the topological insulator BiSe, grown by molecular beam epitaxy, down to 3 quintuple layers.
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