School of Science Department of Physics 66 Weyl Nodal Ring Semimetals and Their Large Magnetoresistance Supervisor: LEI Shiming / PHYS Student: FAN Yeung / PHYS LI Zhuoqun / PHYS Course: UROP 3200, Summer UROP 2100, Summer TMD materials are crucial semiconductor materials in next-generation electronic and optoelectronic devices, WS2 is a typical representative of these materials. In this project, we aim to measure the superconducting transition temperature (Tc) and other interesting properties of thin 2M-WS₂ flakes. To do so, we managed to find an effective way to exfoliate 2M-WS₂ bulk material, especially the new GE Varnish-based 2M-WS₂ master substrate methods. After that, we also explored stable and effective recipes for fabricating highquality two-dimensional WS2 devices, including dry transfer and release of the thin 2M-WS₂ flakes onto different electrodes. Due to the time limit, we have fabricated three devices and are waiting for the measured results. Weyl Nodal Ring Semimetals and Their Large Magnetoresistance Supervisor: LEI Shiming / PHYS Student: HU Woyu / PHYS-IRE Course: UROP 1100, Summer Magnetic topological insulators exhibiting the quantum anomalous Hall (QAH) effect, which manifests as quantized Hall conductance at zero magnetic field, are pivotal for exploring topological phenomena with spontaneously broken time-reversal symmetry and advancing dissipationless electronic devices. Our goal is to explore the QAH effect in thin flakes of MnBi2Te4 (MBT). When measuring MnBi2Te4 samples, we need to minimize oxidation. We use graphene (Gr) and hBN to protect it. My intial task is to obtain thin flakes of graphene and hBN. Organic Molecular Beam Deposition in Ultra-High Vacuum Supervisor: LIN Nian / PHYS Student: WU Dailin / DSCT Course: UROP 1000, Summer Metal-organic framework (MOF) is a type of material composed of metal ions or clusters coordinated to organic ligands to form a porous structure. MOFs are known for their high surface area and tunable porosity, making them useful for applications such as gas storage, separation, catalysis, and sensing. In our lab, MOFs are produced under ultra-high vacuum (UHV) circumstance (10−10 ), where we can protect MOFs from contamination. We usually heat metal source and molecule source until they are vaporized and deposit on a substrate. After MOFs are created, we use scanning tunneling microscope (STM) to inspect and analyze their structures and properties.
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