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    Recent progress on the planar Hall effect in quantum materials
    Jingyuan Zhong(钟景元), Jincheng Zhuang(庄金呈), and Yi Du(杜轶)
    Chin. Phys. B, 2023, 32 (4): 047203.   DOI: 10.1088/1674-1056/acb91a
    Abstract238)   HTML6)    PDF (3789KB)(167)      
    The planar Hall effect (PHE), which originates from anisotropic magnetoresistance, presents a qualitative and simple approach to characterize electronic structures of quantum materials by applying an in-plane rotating magnetic field to induce identical oscillations in both longitudinal and transverse resistances. In this review, we focus on the recent research on the PHE in various quantum materials, including ferromagnetic materials, topological insulators, Weyl semimetals, and orbital anisotropic matters. Firstly, we briefly introduce the family of Hall effect and give a basic deduction of PHE formula with the second-order resistance tensor, showing the mechanism of the characteristic π-period oscillation in trigonometric function form with a π/4 phase delay between the longitudinal and transverse resistances. Then, we will introduce the four main mechanisms to realize PHE in quantum materials. After that, the origin of the anomalous planar Hall effect (APHE) results, of which the curve shapes deviate from that of PHE, will be reviewed and discussed. Finally, the challenges and prospects for this field of study are discussed.
    57Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE-Fe-B permanent magnets
    Lizhong Zhao(赵利忠), Xuefeng Zhang(张雪峰), Mi Yan(严密), Zhongwu Liu(刘仲武), and Jean-Marc Greneche
    Chin. Phys. B, 2021, 30 (1): 013302.   DOI: 10.1088/1674-1056/abc53d
    Abstract324)   HTML1)    PDF (5702KB)(224)      
    This review summarizes the recent advances on the application of 57Fe Mössbauer spectrometry to study the magnetic and phase characteristics of Nd-Fe-B-based permanent magnets. First of all, the hyperfine structures of the Ce2Fe14B, (Ce, Nd)2Fe14B and MM2Fe14B phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting ∆ E Q of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field B hf increases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by the 57Fe Mössbauer spectrometry due to its high sensitivity. On this basis, the content, magnetic behavior, and magnetization of the REFe2 phase, the amorphous grain boundary (GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.
    Flattening is flattering: The revolutionizing 2D electronic systems
    Baojuan Dong(董宝娟), Teng Yang(杨腾), Zheng Han(韩拯)
    Chin. Phys. B, 2020, 29 (9): 097307.   DOI: 10.1088/1674-1056/aba605
    Abstract358)   HTML    PDF (7569KB)(112)      
    Two-dimensional (2D) crystals are known to have no bulk but only surfaces and edges, thus leading to unprecedented properties thanks to the quantum confinements. For half a century, the compression of z-dimension has been attempted through ultra-thin films by such as molecular beam epitaxy. However, the revisiting of thin films becomes popular again, in another fashion of the isolation of freestanding 2D layers out of van der Waals (vdW) bulk compounds. To date, nearly two decades after the nativity of the great graphene venture, researchers are still fascinated about flattening, into the atomic limit, all kinds of crystals, whether or not they are vdW. In this introductive review, we will summarize some recent experimental progresses on 2D electronic systems, and briefly discuss their revolutionizing capabilities for the implementation of future nanostructures and nanoelectronics.
    Multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields
    Peng-Cheng Li(李鹏程), Shih-I Chu
    Chin. Phys. B, 2020, 29 (8): 083202.   DOI: 10.1088/1674-1056/ab9c0f
    Abstract615)   HTML    PDF (2340KB)(161)      

    We present the recent new developments of time-dependent Schrödinger equation and time-dependent density-functional theory for accurate and efficient treatment of the electronic structure and time-dependent quantum dynamics of many-electron atomic and molecular systems in intense laser fields. We extend time-dependent generalized pseudospectral (TDGPS) numerical method developed for time-dependent wave equations in multielectron systems. The TDGPS method allows us to obtain highly accurate time-dependent wave functions with the use of only a modest number of spatial grid point for complex quantum dynamical calculations. The usefulness of these procedures is illustrated by a few case studies of atomic and molecular processes of current interests in intense laser fields, including multiphoton ionization, above-threshold ionization, high-order harmonic generation, attosecond pulse generation, and quantum dynamical processes related to multielectron effects. We conclude this paper with some open questions and perspectives of multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields.

    Spin transport in antiferromagnetic insulators
    Zhiyong Qiu(邱志勇), Dazhi Hou(侯达之)
    Chin. Phys. B, 2019, 28 (8): 088504.   DOI: 10.1088/1674-1056/28/8/088504
    Abstract702)   HTML    PDF (3095KB)(491)      
    Electrical spin, which is the key element of spintronics, has been regarded as a powerful substitute for the electrical charge in the next generation of information technology, in which spin plays the role of the carrier of information and/or energy in a similar way to the electrical charge in electronics. Spin-transport phenomena in different materials are central topics of spintronics. Unlike electrical charge, spin transport does not depend on electron motion, particularly spin can be transported in insulators without accompanying Joule heating. Therefore, insulators are considered to be ideal materials for spin conductors, in which magnetic insulators are the most compelling systems. Recently, we experimentally studied and theoretically discussed spin transport in various antiferromagnetic systems and identified spin susceptibility and the Néel vector as the most important factors for spin transport in antiferromagnetic systems. Herein, we summarize our experimental results, physical nature, and puzzles unknown. Further challenges and potential applications are also discussed.
    Electronic structures of impurities and point defects in semiconductors
    Yong Zhang(张勇)
    Chin. Phys. B, 2018, 27 (11): 117103.   DOI: 10.1088/1674-1056/27/11/117103
    Abstract699)   HTML    PDF (3275KB)(237)      

    A brief history of the impurity theories in semiconductors is provided. A bound exciton model is proposed for both donor-and acceptor-like impurities and point defects, which offers a unified understanding for “shallow” and “deep” impurities and point defects. The underlying physics of computational results using different density-functional theory-based approaches are discussed and interpreted in the framework of the bound exciton model.

ISSN 1674-1056   CN 11-5639/O4

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