School of Science Department of Physics 65 High-Quality Two-Dimensional Heterostructural Device: From Materials Synthesis to Device Fabrication Supervisor: LEI Shiming / PHYS Student: FAN Yeung / PHYS LI Zhuoqun / PHYS Course: UROP 1100, Fall MnBi2Te4 have demonstrated great research potential due to its ability of hosting a variety of exotic transport phenomena, such as the quantum anomalous Hall effect and the quantum spin Hall effect (Li, et al., 2024). Its van der Waal’s nature results in possibilities of exfoliating MnBi2Te4 films, which can be utilized to fabricate devices and study these phenomena (Hu, Qian, & Ni, 2024). However, fabrication of a high quality MnBi2Te4 device remains a challenging task due to high difficulty of exfoliating and transferring MnBi2Te4 firms. In the last phase (summer 2024) of this project, our team proposed a working procedure of fabricating such devices. This phase (fall 2024), we have further improved our technique of fabricating device and its quality. Working devices were also produced which produced exciting measurement data. High-Quality Two-Dimensional Heterostructural Device: From Materials Synthesis to Device Fabrication Supervisor: LEI Shiming / PHYS Student: FAN Yeung / PHYS Course: UROP 2100, Spring WS2 has recently demonstrated great research potential due to many of its interesting physiochemical properties. For instance, novel superconductivity mechanism: spin-orbit-parity coupled superconductivity, has been reported in 2M-WS2. Furthermore, the intercalation of carbon compounds in 2M-WS2 has emerged as a brand-new material which allows study on properties of two-dimensional WS2. Previously, our group has successfully synthesized both 2M-WS2 and intercalated WS2. This project explored multiple ways of obtaining their ultra-thin sample via mechanical exfoliation. Some measurements were also conducted, and a device was successfully fabricated. High-Quality Two-Dimensional Heterostructural Device: From Materials Synthesis to Device Fabrication Supervisor: LEI Shiming / PHYS Student: PENG Junjie / PHYS-IRE Course: UROP 1100, Summer The transition metal dichalcogenides (TMDs) have attracted much attention in recent years. The weak outof-plane van der Waals (vdW) interactions between the TMD layers make it possible to exfoliate and create atomically thin layers, which will allow the experimental realization of two-dimensional electron system (2DES) and further observation of novel phenomena. The molybdenum ditelluride (MoTe2) is one of the most promising TMDs. This article will introduce the quantum anomalous Hall (QAH) effect together with the practical device fabrication techniques of moiré MoTe2.
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