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Progress in Physics

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    20 June 2022, Volume 42 Issue 3 Previous Issue    Next Issue
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    Development Status of Topological Superfluid in Ultracold Atoms
    FENG Jian, ZHANG Wei-wei, LIN Liang-wei, CAI Qi-peng, ZHANG Yi-cai, LIU Chao-fei
    2022, 42 (3):  67-95.  doi: 10.13725/j.cnki.pip.2022.03.001
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    The topological superfluid state is protected by the energy gap in the bulk, but it can accommodate the gapless Majorana fermions at the edge of the system. The Majorana fermions satisfy non-Abelian statistics and are protected by topology and have good stability, they can carry quantized information and can be used in the study of topological quantum computing. In recent years, theoretical work has predicted the possible topological superfluid states in various systems. Firstly, we introduce the topological superfluid in various optical lattice models. The ultracold atoms of optical lattice have good controllability and universality. It is an ideal model system to realize topological superfluid. Next, we introduce the topological superfluid under the control of spin orbit coupling. The spin orbit coupling effect is an important condition to induce the topological phase, and the artificial spin orbit coupling has been realized in the experiment. Which makes a breakthrough for the experimental observation of topological superfluid. With the improvement of experimental technology in recent years, the topological FFLO superfluid phase, which was difficult to observe in the experiment and ignored by people, has also become a research hotspot. Therefore, we next introduce the topological FFLO superfluid. In addition, we also introduce the progress in other aspects of topological superfluid, including topological superfluid induced by soliton, three-component topological superfluid, topological superfluid with large Chern number, and the high critical temperature of topological superfluid. In the experiment, how to detect and implement topological superfluid is the purpose and significance of our research. Therefore, we introduce the identification and implementation of topological superfluid at the end of the article.
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    Probing the Electronic Structure and Dimensionality Tuning of Ce-Based Heavy Fermion Materials
    WU Yi , LI Peng , WU Zhong-zheng , FANG Yuan , LIU Yang
    2022, 42 (3):  96-120.  doi: 10.13725/j.cnki.pip.2022.03.002
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    Heavy fermion compound is a classical type of correlated materials, encompassing unconventional superconductivity, strange metal, quantum criticality, magnetic order, heavy electronic states, correlated topological states, etc, in which 4f electrons play a critical role. With the advancement of high-resolution ARPES measurements and MBE thin film growth techniques, direct observation of the band dispersion and spectral weight of 4f electrons in momentum/energy space has become possible, providing spectroscopic insight for understanding correlated electronic states and novel quantum phenomena. In this review paper, we summarized the electronic studies of several typical heavy fermion compounds and thin films, including Ce-115 families, CuCu2Si2, CeRh6Ge4 and Ce films, etc. The experimental results provide direct evidence to understand the temperature evolution of heavy electronic states, energy/moment-dependent Kondo hybridization, the interplay of heavy electronic state with superconductivity, the competition between Kondo effect with other quantum states and the dimensionality tuning of 4f electrons.
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