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    20 August 2024, Volume 44 Issue 4 Previous Issue    Next Issue

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    The Research Progress on One-Dimensional Spin-Orbit Coupled Fermi Gas
    CAI Qi-peng, ZHANG Wei-wei, LIN Liang-wei, XU Yi-guang, CHEN Zi-xuan, WANG Xiao-sheng, YU Hai-peng, FANG Xiao-hong, ZHANG Yi-cai, LIU Chao-fei
    2024, 44 (4):  157-182.  doi: 10.13725/j.cnki.pip.2024.04.001
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    In ultracold Fermi gases, by adjusting the strength of spin orbit coupling to match Fermi energy, many novel quantum effects can be generated. In the past few decades, scholars have conducted extensive theoretical and experimental research on Fermi gases induced by one-dimensional spin orbit coupling. Compared with high-dimensional spin orbit coupling, one-dimensional spin orbit coupling, although relatively simple, is the most reliable and feasible tool for exploring basic quantum physical phenomena in experiments. This paper systematically summarizes the interesting physical phenomena of Fermi gas under one-dimensional spin orbit coupling in theoretical work. Including theoretical research on dynamic oscillation and soliton effect, topological superfluid, Majorana edge state, ferromagnetic phase transition, and quantum phase. How to achieve spin orbit coupling and observe singular phenomena in experiments is a hot and difficult research topic. We summarize several common experimental schemes and detection methods. Finally, we look forward to the research on Fermi gas induced by one-dimensional spin orbit coupling. One dimensional spin orbit coupling can provide reference for abecedarians and contribute to the study of multi body system regulated by spin orbit coupling. This paper aims to provide a reference for abecedarians in cold atomic physics to gain a deeper understanding of the physical mechanisms of multi-body systems under spin orbit coupling.

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    Electron Transport in Ferroelectric Tunnel Junctions Based on Two-Dimensional Janus GeS Bilayers
    SUN Kang, BIE Jie , LV Yang-yang, CHEN Shuang, FA Wei
    2024, 44 (4):  183-207.  doi: 10.13725/j.cnki.pip.2024.04.003
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    The two-dimensional van der Waals (2D vdW) Janus materials have different atomic species on both sides to ensure their structural asymmetry and inherent out-of-plane polarizations. A novel 2D vdW Janus material, GeS, was found to develop ferroelectric tunnel junctions (FTJs) with low energy consumption and high response speed. Based on our first-principles calculations, it is found that the Janus GeS bilayers own three stacking modes, and their lateral sliding and vertical displacement can both modulate the electron transport in GeS bilayer-based tunnel junctions. In addition, the FTJ based on GeGe-contacting GeS bilayer exhibits the highest on/off ratio. Our study expands the concept of sliding ferroelectricity to a new class of 2D vdW Janus materials and reveals the possible resistance switching mechanism of these materials in real devices. Furthermore, it provides theoretical guidance for the design of low-energy-consumption and fast-switching nanodevices based on 2D vdW Janus materials.

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