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    Research Progress on Two-Dimensional Multiferroic Materials and Their Magnetoelectric Properties
    ZHENG Hongqian , HU Ting , HUANG Chengxi , DU Yongping , WAN Yi
    Progress in Physics    2025, 45 (3): 105-117.   DOI: 10.13725/j.cnki.pip.2025.03.001
    Abstract2222)      PDF (9286KB)(4603)      

    In recent years, multiferroic materials, which possess both ferromagnetic and ferroelectric properties, have attracted intense attention from researchers due to their novel and rich physical characteristics, as well as their broad potential applications in fields such as information storage and sensor technologies. As understanding of the properties of multiferroic materials deepens, researchers have begun to explore their behavior at smaller scales, particularly focusing on two-dimensional (2D) materials. Compared to three-dimensional (3D) materials, 2D materials, owing to their unique structural features and significant size effects, often exhibit more superior performance in terms of mechanical, optical, thermal, and magnetic properties. However, it is noteworthy that current research on 2D multiferroic materials is primarily concentrated on theoretical predictions, with experimental progress lagging behind. In this context, this paper first briefly reviews the development history of multiferroic materials, then elaborates on the characteristics and advantages of 2D materials, and discusses the potential applications of 2D multiferroic materials. Subsequently, the paper provides an overview of the current research status, covering related physical phenomena and mechanisms, experimental preparation methods, performance regulation technologies, and characterization techniques. Furthermore, this paper also enumerates potential 2D multiferroic materials predicted by theory and, based on this, delves into the challenges faced by current research and future directions for development. 

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    Research Progress on Single-Mode Regulation Methods for Whispering Gallery Mode Microcavities
    LIU Shuo, WANG Yu-chen, WANG Xiu-hua, HOU Rui
    Progress in Physics    2023, 43 (4): 117-130.   DOI: 10.13725/j.cnki.pip.2023.04.002
    Abstract1477)      PDF (483KB)(4424)      

    Whispering gallery mode (WGM) microcavities have attracted wide attention due to their small mode volume, ultra-high Q value, and low threshold. However, in rotationally symmetric WGM microcavities, multiple longitudinal mode laser radiation can be generated, and the directionality of the radiation is poor, which limits its practical applications. Finding effective methods to achieve single-mode radiation of WGM lasers is a key issue for microcavity lasers to move toward practical applications. This review focuses on several methods of single-mode modulation of WGM lasing in recent years, including reducing cavity size, adding mode selection structure, based on the vernier effect, parity-time symmetry breaking, deformed microcavity, etc. This review aims to provide a reference for researchers in related fields and deepen their understanding of the physical mechanism of single-mode modulation of WGM lasing.

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    Progress in Preparation and Performance Optimization of 3D/2D Halide Perovskite Heterojunction
    HE Shengrong , XING Jun , YAO Xiaolong , MA Xiaoman , LI Peng
    Progress in Physics    2025, 45 (4): 169-194.   DOI: 10.13725/j.cnki.pip.2025.04.002
    Abstract1126)      PDF (8487KB)(3839)      

    Halide perovskite materials have emerged as a research hotspot in new energy technologies due to their remarkable advantages in photoelectric conversion efficiency, while three-dimensional (3D)/two-dimensional (2D) perovskite heterojunctions have attracted particular attention owing to their unique band structures and flexible regulation capabilities for carrier behavior. This review focuses on the controllable preparation and performance optimization of 3D/2D halide perovskite heterojunctions. It first summarizes the concept, advantages, and conventional preparation methods of 3D/2D perovskite heterojunctions, including solid-liquid post-spin-coating methods, solid-gas vapor deposition approaches, and solidsolid reaction techniques. Subsequently, effective strategies for enhancing the performance of 3D/2D perovskite heterojunctions through interface engineering, material engineering, and device structure optimization are systematically explored. The review then comprehensively summarizes and evaluates recent research progress in the application of 3D/2D heterojunctions in solar cells and photodetectors. Finally, current challenges regarding the stability and environmental adaptability of 3D/2D perovskite heterojunctions are discussed, along with systematic perspectives on future development trends in this research field. This work aims to provide feasible ideas and optimization schemes for realizing the widespread application of 3D/2D perovskite heterojunctions in photoelectric fields.

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    Halide Perovskite Single Crystals and Photodetectors: Research Progress and Challenges 
    SUN Yue, HUANG Xiao-rui , HE Sheng-rong, XING Jun
    Progress in Physics    2024, 44 (5): 209-242.   DOI: 10.13725/j.cnki.pip.2024.05.001
    Abstract3366)      PDF (15745KB)(2630)      

    In recent years, metal halide perovskite materials have made great scientific progress in the field of light detection, photoelectric conversion, and light emission due to their excellent optical and electrical properties (such as high absorption coefficient, long carrier diffusion length, small exciton binding energy, high defect tolerance, and adjustable band gap, etc.), and low-cost solution preparation process. In recent decades, scientific research on the preparation and optimization of perovskite single crystals has been promoted driven by their advantages compared to polycrystalline perovskite films. These advantages include longer carrier lifetime, higher carrier mobility, longer diffusion length, and lower trap density. High-quality halide perovskite single crystals have been widely used in important applications such as photodetection. This review focuses on the recent advancements in photodetector technology using various forms and chemical compositions of halide perovskite single crystals, including single crystal bulks and single crystal thin films. Firstly, we systematically review the preparation and optimization progress of halide perovskite single crystals, with a focus on the latest progress in triple cations hybrid perovskite single crystals. After that, a comprehensive introduction was given to the research status of various types of photodetectors based on perovskite single crystals. Finally, the current challenges and future development prospects in the research field of halide perovskite single crystal photodetector are summarized in order to promote rapid progress and development in this field.

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    A Brief History of Electronic Development
    SHI Feng , LIU Jin-hua , ZHANG Ling-cui , XU Yue , LOU You-xin , SHEN Yan , ZHAO Jin-bo
    Progress in Physics    2025, 45 (2): 79-104.   DOI: 10.13725/j.cnki.pip.2025.02.003
    Abstract2831)      PDF (516KB)(2616)      

    Electron is an inseparable part of atom. The ancients believed that atoms could not be divied, and it was not until the late 19th century that Thomson discovered the existence of electron, which proved that atom is redividable. After that, the complex and challenging journey to uncover the volatility of electrons, electron spin, and positrons led to groundbreaking discoveries, which resulted in numerous of Nobel Prizes were awarded in Physics. The discovery of electron played an important role in promoting the birth of quantum mechani. It was through the meticulous examination of atomic structure models that the scientists progressively ventured into the realms of quantum mechanics and quantum field theory. Similarly, electrons have played a positive role in promoting our understanding of various materials, leading to the development of to many theories, such as Lorentz’s free electron theory, Sommerfeld model, and band theory. Especially band theory has led to a revolution in modern electronic technology, ushering humanity into the information age. 

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    Self-trapped Excitons in Metal Halide Perovskites 
    ZHANG Qin-kai , WANG Yu-xiao , ZHANG Chun-feng
    Progress in Physics    2023, 43 (6): 161-177.   DOI: 10.13725/j.cnki.pip.2023.06.001
    Abstract2357)      PDF (9908KB)(2228)      

    In polar crystals, excited electron-hole pairs can be captured by the deformation potential field created by lattice distortion upon photoexcitation, due to strong electron-phonon interactions, thereby forming self-trapped excitons. Metal halide perovskites are semiconductors that display efficient self-trapped exciton luminescence in various systems due to their ionic crystal nature with strong electron-phonon interactions and a deformable lattice. Consequently, they are considered ideal for creating high-quality white light sources. However, the understanding of the self-trapped exciton luminescence mechanism in metal halide perovskites is still relatively scarce and lags far behind the development of devices. To this end, this paper summarizes the recent research progress on the formation conditions, formation mechanism and related excited state dynamics of self-trapped excitons in metal halide perovskites semiconductors from the perspective of the fundamental physics of self-trapped excitons, and gives an outlook on the future research based on the self-trapped exciton mechanism in this system, so as to provide a clearer physical image for the study of self-trapped excitons in this system

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    Recent Progress in Ultrafast Spin Dynamics in Two-Dimensional van der Waals Antiferromagnets
    LI Jin-yang , WU Fang-liang , ZHANG Qi
    Progress in Physics    2024, 44 (6): 293-308.   DOI: 10.13725/j.cnki.pip.2024.06.003
    Abstract2182)      PDF (4771KB)(2029)      

    Antiferromagnets exhibit high-speed spin responses in the terahertz frequency range and robustness against external magnetic fields, making them promising for nextgeneration high-speed, high-density spintronic devices. Recently, two-dimensional van der Waals magnetic systems, which possess rich antiferromagnetic ground states, have gained significant attention and serve as ideal platforms for studying low-dimensional antiferromagnetic physics. Detecting and controlling ultrafast spin dynamics in two-dimensional antiferromagnetic systems will lay the foundation for high-speed spintronic device applications. Antiferromagnets have no net macroscopic magnetization, making traditional optical methods, such as magneto-optical effects, challenging for detecting antiferromagnetic order in equilibrium states. However, in non-equilibrium states, the instantaneous magnetization generated by antiferromagnetic spin dynamics allows the use of time-resolved magneto-optical Kerr effect to detect coherent spin precession in antiferromagnets. Additionally, techniques such as linear dichroism spectroscopy, terahertz emission spectroscopy, and second harmonic generation have been employed in studying the dynamics of two-dimensional antiferromagnets. This paper introduces recent experimental progress on ultrafast spin dynamics in two-dimensional van der Waals antiferromagnetic systems, and briefly describes the coherent magnon excitations and corresponding mechanisms in two-dimensional antiferromagnets, including inverse magneto-optical effects/stimulated Raman scattering, orbital excitations, and exciton coupling. Furthermore, this paper discusses the critical slowing down of spin dynamics due to spin-lattice coupling effects and the amplification of coherent acoustic phonons.

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    Research Progress on the Regulation of Metal-Site Bismuth Doping in Halide Perovskites
    HUANG Xiao-rui, SUN Yue, HE Sheng-rong, XING Jun
    Progress in Physics    2024, 44 (2): 73-95.   DOI: 10.13725/j.cnki.pip.2024.02.002
    Abstract1825)      PDF (8816KB)(1800)      
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    ZHOU Yi-fan , KONG Ling-xing , WU Ren-jie , LIU Feng
    Progress in Physics    2024, 44 (4): 183-196.   DOI: 10.13725/j.cnki.pip.2024.04.002
    Abstract1191)      PDF (6737KB)(1786)      

    Living cells constantly sense and respond to environmental changes. Transcription, the process by which DNA is transcribed into RNA, serves as a critical bridge between external signals and gene expression, ultimately shaping cellular behavior. To unravel the transcription dynamics and the relationship between input signals and gene expression out-put, various transcription models have been developed. This review explores these common models, their computational frameworks, and the resulting distributions for mRNA number and transcriptional event duration, which offer valuable insights into input-output relationships and underlying response mechanisms. We further analyze how different promoter types, chromatin environments, and network motifs influence these relationships. Finally, we probe how information theory can be applied to systems with near-maximum channel capacity to reveal the dynamic range of transcription factor concentrations, input-output dynamics, and the link between these factors and gene expression distribution. Through these multifaceted analyses, we identify key regulators of dynamic input-output relationships and gain deeper insights into how genes respond to transcription factor signals. Quantitative studies of input-output relationships hold promises for identifying key regulatory factors, predicting changes in gene expression patterns, and designing interventions to manipulate cellular functions and behavior.

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    Perovskite Solar Cells Stability Factors And Encapsulaiton For Performance Enhancement
    DAI Jiaqi, ZHANG Dong, WU Xiaoshan
    Progress in Physics    2024, 44 (1): 19-48.   DOI: 10.13725/j.cnki.pip.2024.01.003
    Abstract3242)      PDF (5083KB)(1754)      

    Perovskite solar cells, which are considered the third generation of new concept solar cells, are known for their high photoelectric conversion efficiency, low cost, and flexible processing advantages, and have been rapidly development in recent years. its photoelectric conversion efficiency is gradually comparable to that of silicon cells and has been close to the level required for industrial applications. However, the main problem with the industrial application of perovskite solar cells is their stability. Researchers need to solve the biggest problem of how to maintain high efficiency for a long time in perovskite solar cells. Encapsulation is currently being widely studied as a solution to the external stability issue of perovskite solar cells. A good encapsulation can not only solve the stability problem of the device but also ensure the safety of the device and extend the service life. The stability of perovskite solar cells and the conditions for testing it are briefly described in this paper. In the end, the various encapsulation structures, techniques, and materials for perovskite solar cells are explained. The continuous advancement of encapsulation research will lead researchers to optimize and solve existing problems, leading to the eventual industrialization of perovskite solar cells on a large scale. 

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    Environmental Stability of 2D Transition Metal Dichalcogenides
    ZHOU Zhen-jia , XU Jie , GAO Li-bo
    Progress in Physics    2023, 43 (4): 97-116.   DOI: 10.13725/j.cnki.pip.2023.04.001
    Abstract1837)      PDF (837KB)(1743)      

    Two-dimensional (2D) transition metal dichalcogenides (TMDCs) with a unique unity of favorable electronic and mechanical properties have been developed for fundamental studies and applications in electronics, spintronics, optoelectronics, energy harvesting and catalysis. However, as they are unstable under harsh conditions, and prone to degradation in the ambient environment, most TMDCs applications are limited. In this review, we analyze the recent advances in the research of environmental stability in TMDCs, covering the latest growth methods, the fundamental mechanisms for stability and kinds of routes to protect 2D TMDCs materials from aging and deterioration. By analyzing key factors that affect TMDCs stability from the growth process, we present a short review of optimizing growth methods for improving the stability of TMDCs. Finally, by providing insights into existing factors, this review is expected to guide the growth of stable TMDCs, which could lead to a new potential approach to growing advanced materials and designing more unexplored heterostructures. 

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    Working Memory: Mechanisms and Modeling Approaches
    YANG Fan, QIAN Rui-xin, WANG Tao
    Progress in Physics    2024, 44 (5): 243-258.   DOI: 10.13725/j.cnki.pip.2024.05.002
    Abstract1559)      PDF (2967KB)(1732)      

    Working memory, a cornerstone of human cognition, allows us to temporarily hold and manipulate information. The delayed response experiment is a fundamental tool for understanding working memory. By inserting a delay between the presentation of stimuli and the behavioral decision, researchers can probe the neural mechanisms underlying information maintenance and manipulation during this delay period. This review delves into the delayed response paradigm and introduces attractor dynamics as a potential mechanism for working memory function. We then systematically explore two common methods for analyzing working memory networks: trajectory tracking, and energy landscape and flux theory. Finally, we summarize the key features of these two dynamical approaches and provide an outlook for future directions of working memory research.

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    Excited-State Dynamics of Two-Dimensional Transition Metal Dichalcogenides
    QIN Chunbo , ZHANG Chunfeng
    Progress in Physics    2025, 45 (4): 195-207.   DOI: 10.13725/j.cnki.pip.2025.04.003
    Abstract585)      PDF (5372KB)(1725)      

    Two-dimensional transition metal chalcogenides exhibit strong light-matter interactions and pronounced excitonic effects, the study of their excited-state dynamics is essential for advancing both fundamental research and technological applications. This review summarizes recent advances in the investigation of excited-state dynamics in monolayer transition metal chalcogenides and their van der Waals heterostructures. Specifically, we discuss the generation and recombination dynamics of excitons in monolayers, as well as interlayer excitons in heterostructures. Particular emphasis is placed on interlayer charge transfer and the influence of stacking angles and moiré superlattices on excited-state dynamics. Finally, we highlight open questions in the field and provide an outlook on future research directions. 

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    Potential mechanisms of comorbidity between autism spectrum disorder and attention deficit hyperactivity disorder
    YU Chen, ZHANG Xiaopeng, WANG Wei
    Progress in Physics    2025, 45 (6): 261-280.   DOI: 10.13725/j.cnki.pip.2025.06.001
    Abstract836)      PDF (817KB)(1716)      

    Autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) exhibit a high rate of comorbidity. This paper systematically reviews existing studies at different levels to summarize the common pathological mechanisms underlying the comorbidity of ASD and ADHD. Specifically: (1) Both diseases exhibit abnormal synaptic pruning, leading to a further aggravation of abnormal brain structure in patients with the comorbidity; (2) Dysfunction of the default mode network and executive control network constitutes important neurobiological evidence for the comorbidity of the two disorders; (3) The abnormal signaling pathways implicated in ASD and ADHD mainly involve the dopamine, Wnt, GABA, mTOR, and inflammation-related pathways, all of which are closely associated with the stability of synapse numbers; (4) Abnormal synaptic pruning leads to excitatory/inhibitory (E/I) imbalance, which may provide the physiological basis for abnormal functional connectivity of brain networks and altered cortical thickness and volume in higher cognitive regions such as the prefrontal cortex. Moreover, by computational neural network modeling and molecular network modeling, it is expected to advance the understanding of the co-morbidity mechanism of autism and attention deficit hyperactivity disorder. In this review, we elucidate the pathological mechanism of comorbidity in two typical diseases related to neurodevelopmental disorders from different perspectives, and may provide a theoretical basis for early intervention and precise treatment in comorbid patients.

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    Research Progress on the Influence of Terahertz Waves on Neurotransmitter Synaptic Transmission
    CHEN Chen , DING Hong-ming , MA Yu-qiang
    Progress in Physics    2025, 45 (1): 32-46.   DOI: 10.13725/j.cnki.pip.2025.01.002
    Abstract1235)      PDF (2539KB)(1691)      

    Terahertz waves are a type of electromagnetic wave between microwaves and infrared waves. Due to its physical properties such as strong penetration, non-ionization and strong absorption, and the ability to achieve non-contact regulation of synaptic transmission, it has shown great application prospects. The synaptic transmission process is closely related to neurodegenerative diseases. Understanding the response of terahertz waves to the synaptic transmission process has a guiding role in the prevention and treatment of related diseases. This paper first introduces the physical properties of terahertz waves, biological effects and related concepts of synaptic transmission in detail, and then focuses on the influence of terahertz waves on the synaptic transmission process, namely the presynaptic, synaptic cleft and postsynaptic stages. Finally, the potential application of terahertz waves in the future synaptic transmission process is summarized and prospected.

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    Progress on High-Pressure Structure and Properties of Phosphorus and Phosphide
    HUANG Ye-hua, GUO Zhen-yuan, LI Jun-kai, YANG Xin, GOU Hui-yang
    Progress in Physics    2024, 44 (3): 123-135.   DOI: 10.13725/j.cnki.pip.2024.03.003
    Abstract1441)      PDF (6131KB)(1624)      

    Phosphorus,a group V non-metallic element, exhibits a unique electronic structure along with excellent optical, electrical and mechanical properties, and has a wide range of application prospects. Recent studies have demonstrated that phosphorus and phosphides are easily affected and regulated by external fields and have rich physical and chemical properties under high pressure. In addition, the unique structure and electronic properties of phosphorus and phosphides give them many physical properties that differ from those of traditional materials. Therefore, the use of high pressure to induce structural transformation and superconducting transformation in phosphorus and phosphides has become the focus of high-pressure research. In this paper, the structural, electrical, and optical responses of black phosphorus, germanium phosphide, and arsenic phosphide under high-pressure conditions are reviewed and discussed. Furthermore, we also explore the structure-activity relationships between the structures and physical properties and forecast the future research directions of phosphides under high pressure.

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    Attractor Dynamics in Spatial Cognition
    WANG Zi-qun , WANG Tao , LIU Feng
    Progress in Physics    2023, 43 (6): 188-201.   DOI: 10.13725/j.cnki.pip.2023.06.003
    Abstract1588)      PDF (3411KB)(1603)      

    The mammalian navigation system comprises various kinds of neurons responsible for position perception and spatial path planning, involving the integration of multiple information sources. As a unified brain theory capable of providing explanations for complex cognitive functions like memory and decision-making, the theory of attractor dynamics can elucidate the firing dynamics of neurons and path integration in the navigation system. This review describes recent advances in attractor dynamics in spatial cognition. First, it provides a brief overview of computational neuroscience and the general theory of attractor dynamics. Subsequently, focusing on the continuous attractor dynamics, it delves into the dynamical characteristics and functional significance of head direction cells and grid cells. Finally, an extension and prospects of the attractor theory for spatial cognition are presented.

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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
    Progress in Physics    2024, 44 (4): 157-182.   DOI: 10.13725/j.cnki.pip.2024.04.001
    Abstract1266)      PDF (3164KB)(1587)      

    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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    Measurement methods of magnetic fields in laboratory astrophysics
    SHI Chuanqi , YUAN Dawei , ZHAO Gang
    Progress in Physics    2025, 45 (3): 151-159.   DOI: 10.13725/j.cnki.pip.2025.03.004
    Abstract854)      PDF (5979KB)(1585)      

    Magnetic fields are ubiquitous in the universe, such as Earth, Sun, supernova remnants, nebulae, giants, neutron stars, black holes and so on. Despite their widespread presence, there remain numerous unanswered questions about astronomical magnetic fields. For instance, how are initial magnetic fields generated? How do magnetic fields undergo amplification? With the advent of high-power, high-energy laser facilities, laboratory astrophysics provides a new method to the study of astrophysical problems in a controlled laboratory setting, where researchers recreate extreme physical conditions similar to those found in astrophysical objects or their surroundings. The benefits of this method include the short distance, activity, controlled condition and reproducibility. Under the scaling laws, laboratory plasmas can study the origin and amplification of astrophysical magnetic fields. Various measurement techniques are employed in current laboratory studies to assess magnetic fields, including magnetic probes, magnetic tapes, Zeeman effect, Faraday rotation, and proton radiography. Understanding the principles and characteristics of these diagnostic methods is essential in selecting the appropriate method for measuring magnetic fields in experiments. 

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    Two-Dimensional Transistors beyond Silicon Counterparts: From Theory to Experiment
    LI Hong , XU Lin , QIU Chenguang , LU Jing
    Progress in Physics    2025, 45 (3): 118-131.   DOI: 10.13725/j.cnki.pip.2025.03.002
    Abstract2228)      PDF (2085KB)(1526)      

    Due to the severe short-channel effects, silicon-based transistors cannot work well when the gate length is shorter than 10 nm. Moore’s law is at risk of failure. Compared to bulk semiconductor materials, two-dimensional (2D) materials own better electrostatic features and higher carrier mobilities. To describe the transport properties of transistors at the nanometer scale, the first-principles quantum transport simulation based on density functional theory coupled with non-equilibrium Green’s function method is the most precise theoretical tool. The device performances of ideal 2D transistors are predicted to surpass those of silicon-based transistors based on the first-principles quantum transport simulation, which can meet the International Technology Roadmap for Semiconductors (ITRS) and International Roadmap for Device and Systems (IRDS) requirements for the next decade and extend Moore’s law to sub-10 nm gate lengths . We review dramatic experimental breakthroughs on 2D transistors in the recent two years, including shrinking the gate length to the Angstrom scale, descending the electrode contact resistance to the quantum limit, and fabricating high-quality and ultrathin dielectric. When Ohmic contacts and high-quality ultrathin dielectric layers are simultaneously realized, theoretically predicted superior performances beyond silicon are observed in 10-nmgate InSe transistors experimentally. 

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