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Valley photonic crystals 谷光子晶体
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1905546
Jian-Wei Liu, Fulong Shi, Xin-Tao He, Guo-Jing Tang, Wen-Jie Chen, Xiaodong Chen, Jianwen Dong
ABSTRACT Topological photonics is an emerging field that attracts enormous interest for its novel ways to engineer the flow of light. With the help of topological protection, the surface modes of topological photonic systems have intriguing properties, such as the unidirectional propagation, robust transmission against defects and disorders, which meet the rapidly growing demands for information processing. Valley photonic crystals, as one kind of topological photonic systems, not only support protected surface modes, but also are friendly to micro-nano fabrication. These advantages show that it has broad prospects in constructing high-performance photonic devices or even photonic integrated circuits. Here, we review the properties and development of valley photonic crystals. Firstly, the theory and structure are briefly introduced and then the discussion of robust transmission will be followed. Furthermore, prototypes of on-chip devices based on valley photonic crystals are reviewed. As a perspective in photonics, valley photonic crystal is expected to become a good platform to study nanophotonics and realize advancing integrated photonics devices. Graphical Abstract
拓扑光子学是一个新兴领域,以其新颖的设计光流的方法吸引了人们的极大兴趣。在拓扑保护的作用下,拓扑光子系统的表面模式具有单向传输、抗缺陷和抗干扰的鲁棒性,满足了快速增长的信息处理需求。谷光子晶体作为一种拓扑光子系统,不仅支持保护表面模式,而且易于微纳加工。这些优点表明它在构建高性能光子器件甚至光子集成电路方面具有广阔的前景。本文综述了谷光子晶体的性质及其研究进展。首先简要介绍了系统的原理和结构,然后讨论了系统的鲁棒传输问题。此外,还介绍了基于谷光子晶体的片上器件的原型。谷光子晶体作为光子学的一个视角,有望成为研究纳米光子学和实现先进集成光子学器件的良好平台。图形抽象
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引用次数: 38
High-energy few-cycle pulses: post-compression techniques 高能少周期脉冲:后压缩技术
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2020.1845795
T. Nagy, P. Simon, L. Veisz
ABSTRACT Contemporary ultrafast science requires reliable sources of high-energy few-cycle light pulses. Currently two methods are capable of generating such pulses: post compression of short laser pulses and optical parametric chirped-pulse amplification (OPCPA). Here we give a comprehensive overview on the post-compression technology based on optical Kerr-effect or ionization, with particular emphasis on energy and power scaling. Relevant types of post compression techniques are discussed including free propagation in bulk materials, multiple-plate continuum generation, multi-pass cells, filaments, photonic-crystal fibers, hollow-core fibers and self-compression techniques. We provide a short theoretical overview of the physics as well as an in-depth description of existing experimental realizations of post compression, especially those that can provide few-cycle pulse duration with mJ-scale pulse energy. The achieved experimental performances of these methods are compared in terms of important figures of merit such as pulse energy, pulse duration, peak power and average power. We give some perspectives at the end to emphasize the expected future trends of this technology. Graphical abstract
当代超快科学需要可靠的高能少周期光脉冲源。目前能够产生这种脉冲的方法有两种:激光短脉冲后压缩和光参量啁啾脉冲放大(OPCPA)。本文对基于光学克尔效应或电离的后压缩技术进行了全面的概述,特别强调了能量和功率缩放。讨论了相关类型的后压缩技术,包括块状材料中的自由传播、多板连续体生成、多通细胞、细丝、光子晶体光纤、空心芯光纤和自压缩技术。我们提供了物理学的简短理论概述以及对现有后压缩实验实现的深入描述,特别是那些可以提供mj级脉冲能量的少周期脉冲持续时间的实验实现。从脉冲能量、脉冲持续时间、峰值功率和平均功率等重要性能指标对这些方法的实验性能进行了比较。最后给出了一些展望,强调了该技术未来的发展趋势。图形抽象
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引用次数: 39
Quantum control in open and periodically driven systems 开放和周期驱动系统中的量子控制
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2020.1870559
Si-Yuan Bai, Chong Chen, Hong Wu, J. An
ABSTRACT Quantum technology resorts to efficient utilization of quantum resources to realize technique innovation. The systems are controlled such that their states follow the desired manners to realize different quantum protocols. However, the decoherence caused by the system-environment interactions causes the states deviating from the desired manners. How to protect quantum resources under the coexistence of active control and passive decoherence is of significance. Recent studies have revealed that the decoherence is determined by the feature of the system-environment energy spectrum: Accompanying the formation of bound states in the energy spectrum, the decoherence can be suppressed. It supplies a guideline to control decoherence. Such idea can be generalized to systems under periodic driving. By virtue of manipulating Floquet bound states in the quasienergy spectrum, coherent control via periodic driving dubbed as Floquet engineering has become a versatile tool not only in controlling decoherence, but also in artificially synthesizing exotic topological phases. We will review the progress on quantum control in open and periodically driven systems. Special attention will be paid to the distinguished role played by the bound states and their controllability via periodic driving in suppressing decoherence and generating novel topological phases.
量子技术通过对量子资源的有效利用来实现技术创新。对系统进行控制,使其状态遵循所需的方式来实现不同的量子协议。然而,由系统-环境相互作用引起的退相干导致状态偏离期望的方式。如何在主动控制和被动退相干共存的情况下保护量子资源具有重要意义。近年来的研究表明,退相干是由系统环境能谱的特征决定的,伴随着能谱中束缚态的形成,退相干可以被抑制。它提供了一个控制退相干的准则。这种思想可以推广到周期驱动下的系统。通过控制准能谱中的Floquet束缚态,周期驱动的相干控制被称为Floquet工程,不仅在控制退相干方面,而且在人工合成奇异拓扑相位方面都是一种通用的工具。我们将回顾开放和周期驱动系统中量子控制的进展。我们将特别关注束缚态在抑制退相干和产生新的拓扑相方面所起的重要作用,以及它们通过周期性驱动的可控性。
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引用次数: 6
Tracking ultrafast reactions in organic materials through vibrational coherence: vibronic coupling mechanisms in singlet fission 通过振动相干跟踪有机材料中的超快反应:单线态裂变中的振动耦合机制
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1918022
Woojae Kim, A. Musser
ABSTRACT A multitude of ultrafast photoinduced reactions in organic semiconductors are governed by the close interplay between nuclear and electronic degrees of freedom. From biological light-harvesting and photoprotection to organic solar cells, the critical electronic dynamics are often precisely synchronized with and driven by nuclear motions, in a breakdown of the Born-Oppenheimer approximation. Ultrafast time-domain Raman methods exploit impulsive excitation to generate nuclear wavepackets and track their coherent evolution through these reaction pathways in real time. This tool of vibrational coherence has recently been applied to study singlet fission, a carrier multiplication process with the potential to boost solar cell efficiencies which has been under intense mechanistic investigation for the past decade. In this review, we present the essential features of the spectroscopic techniques and discuss how they have been used to elaborate a new perspective on the singlet fission mechanism. It is now established that ultrafast triplet-pair formation is driven by vibronic coupling, whether fission is exothermic or endothermic, and thus that full understanding of singlet fission requires explicit consideration of nuclear dynamics. Despite broad qualitative agreement between different vibrational coherence methods, differences in the detailed observations and interpretation raise important questions and pose new challenges for future research. Graphical abstract
摘要有机半导体中的许多超快光致反应都是由核自由度和电子自由度之间的密切相互作用决定的。从生物光采集和光保护到有机太阳能电池,关键的电子动力学通常与核运动精确同步并由核运动驱动,这打破了Born-Oppenheimer近似。超快时域拉曼方法利用脉冲激发产生核波包,并实时跟踪其通过这些反应途径的相干演化。这种振动相干工具最近被应用于研究单线态裂变,这是一种有可能提高太阳能电池效率的载流子增殖过程,在过去十年中一直在进行深入的机制研究。在这篇综述中,我们介绍了光谱技术的基本特征,并讨论了如何利用它们来阐述单线态裂变机制的新观点。现在已经确定,超快三重态对的形成是由振动耦合驱动的,无论裂变是放热的还是吸热的,因此,对单线态裂变的充分理解需要明确考虑核动力学。尽管不同的振动相干方法在质量上有着广泛的一致性,但详细观测和解释的差异提出了重要问题,并对未来的研究提出了新的挑战。图形摘要
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引用次数: 12
Recent development of new inductively coupled thermal plasmas for materials processing 新型材料加工用电感耦合热等离子体研究进展
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2020.1867637
Yasunori Tanaka
ABSTRACT This paper explains recent developments in the field of inductively coupled thermal plasmas (ICTP or ITP) used for materials processing. Inductive coupling technique is important to produce thermal plasma with high gas temperature at high pressures. Conventional cylindrical ICTP was developed originally in the 1960s by T. Reed. It remains widely used for different materials processing today, with almost identical configuration to the original version. Through some revision and improved functionalization, ICTPs of several kinds such as DC–RF hybrid ICTP have also been developed. They are also widely adopted for processing of various materials because of their various benefits. Inductively coupled plasma at low pressures are not treated herein: only thermal plasma with high enthalpy. One is modulated induction thermal plasma (MITP), which has a function of controlling the temperature and chemical active fields in the time domain. Another development in ICTP includes changes in the ICTP configuration such as a planar-ICTP and loop-ICTP. These were developed for large-area materials processing. GRAPHICAL ABSTRACT
本文介绍了用于材料加工的电感耦合热等离子体(ICTP或ITP)领域的最新进展。电感耦合技术是在高压条件下产生高气体温度热等离子体的重要技术。传统的圆柱形ICTP最初是在20世纪60年代由T. Reed开发的。今天,它仍然广泛用于不同的材料加工,与原始版本几乎相同的配置。经过一些改进和功能化,还开发了几种类型的ICTP,如DC-RF混合ICTP。由于其各种优点,也被广泛应用于各种材料的加工。这里不处理低压下的电感耦合等离子体,只处理高焓的热等离子体。一种是调制感应热等离子体(MITP),它具有控制时域温度和化学活性场的功能。ICTP的另一个发展包括对ICTP配置的更改,例如平面ICTP和循环ICTP。这些是为大面积材料加工而开发的。图形抽象
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引用次数: 6
Ab initio modeling of excitons: from perfect crystals to biomaterials 从头算激子建模:从完美晶体到生物材料
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1912638
G. Tirimbò, B. Baumeier
ABSTRACT Excitons, or coupled electron-hole excitations, are important both for fundamental optical properties of materials as well as and for the functionality of materials in opto-electronic devices. Depending on the material they are created in, excitons can come in many forms, from Wannier–Mott excitons in inorganic semiconductors, to molecular Frenkel or bi-molecular charge-transfer excitons in disordered organic or biological heterostructures. This multitude of materials and exciton types poses tremendous challenges for ab initio modeling. Following a brief overview of typical ab initio techniques, we summarize our recent work based on Many-Body Green’s Functions Theory in the GW approximation and Bethe–Salpeter Equation (BSE) as a method applicable to a wide range of material classes from perfect crystals to disordered materials. In particular, we emphasize the current challenges of embedding this GW-BSE method into multi-method, mixed quantum-classical (QM/MM) models for organic materials and illustrate them with examples from organic photovoltaics and fluorescence spectroscopy. Our perspectives on future studies are also presented. Graphical Abstract
摘要激子,或称耦合电子-空穴激发,对材料的基本光学性质以及材料在光电器件中的功能都很重要。根据产生激子的材料,激子可以有多种形式,从无机半导体中的Wannier–Mott激子,到无序有机或生物异质结构中的分子Frenkel或双分子电荷转移激子。这种大量的材料和激子类型对从头算建模提出了巨大的挑战。在简要概述了典型的从头算技术之后,我们总结了我们最近基于GW近似中的多体格林函数理论和Bethe–Salpeter方程(BSE)的工作,该方法适用于从完美晶体到无序材料的广泛材料类别。特别是,我们强调了将这种GW-BSE方法嵌入有机材料的多方法混合量子经典(QM/MM)模型中的当前挑战,并用有机光伏和荧光光谱的例子进行了说明。还介绍了我们对未来研究的看法。图形摘要
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引用次数: 2
Progress of nematic superconductivity in iron-based superconductors 铁基超导体中向列超导的研究进展
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1878931
Jinghui Wang, Yueshen Wu, Xiang Zhou, Yifei Li, Bolun Teng, P. Dong, Jiadian He, Yiwen Zhang, Yifan Ding, Jun Li
ABSTRACT Despite more than ten years of extensive research, the superconducting mechanism of iron-based superconductors (FeSCs) is still an open question. Generally, the high-temperature superconductivity is often observed with suppression of magnetic ordering, spin-density-wave, or even the structure transition by carrier doping. Furthermore, an electronic state ordering is also observed at temperatures close to or even above these transitions. Due to its proximity to the superconducting state and disappearance near the optimal superconductivity, it has been also suggested to interplay with superconductivity on a phenomenological level. Nevertheless, there is still no direct evidence to bridge the superconductivity to these transitions. Recently, another nematic order was observed in the superconducting state of heavily hole-doped compound AFe As (A = K, Rb, Cs), providing a possibility to explore the superconductivity gap symmetry nature. Here, by reviewing the recent experimental progresses on the nematic superconductivity in the FeSCs, we will introduce the progresses by various methods including the quasi-particle interference from scanning tunneling microscope, anisotropic gap magnitudes from angular resolved photoemission, the upper critical field and the superconducting transition temperatures from transport measurements. In addition, some recent reports and theoretical explanations for experimental results are followed. Graphical abstract
摘要尽管经过十多年的广泛研究,铁基超导体的超导机理仍然是一个悬而未决的问题。通常,通过载流子掺杂抑制磁有序、自旋密度波甚至结构转变,可以观察到高温超导性。此外,在接近或甚至高于这些转变的温度下也观察到电子状态有序。由于它接近超导状态,在最佳超导电性附近消失,也有人认为它在现象学水平上与超导电性相互作用。尽管如此,仍然没有直接的证据将超导性与这些转变联系起来。最近,在重空穴掺杂化合物AFe-As(A=K,Rb,Cs)的超导态中观察到了另一个向列有序,这为探索超导间隙对称性提供了可能性。在这里,通过回顾最近在FeSC向列超导性方面的实验进展,我们将介绍各种方法的进展,包括扫描隧道显微镜的准粒子干涉、角分辨光电发射的各向异性间隙大小、上临界场和输运测量的超导转变温度。此外,还介绍了最近的一些报道和对实验结果的理论解释。图形摘要
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引用次数: 5
Information in electrodeposited dendrites 电沉积枝晶中的信息
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1920846
M. Kozicki
ABSTRACT Dendrites are structures that develop with a continuously branching tree-like form. Such patterns are found in many aspects of the natural world, which indicates the universality of their topology. This review presents an examination of dendritic structures, addressing their stochasticity and fractal character, and exploring their information content or more specifically their ability to provide a very large number of unique patterns that may be used as a novel form of item identification. A brief summary of fractals and their dimensionality is presented and applied to the well-known diffusion limited aggregate (DLA) dendritic construct. Dendrites formed by electrochemical ‘self-assembly’ are explored and examples given of their formation under different conditions. Stochastic variations in the self-similar Y-shaped symbol that underlies these fractals can carry information, leading to significant entropy, even though the structural entropy of the overall pattern is relatively small.
树枝状结构是以连续分支的树状形式发展起来的结构。这种模式在自然界的许多方面都有,这表明了它们拓扑结构的普遍性。这篇综述对树枝状结构进行了研究,解决了它们的随机性和分形特征,并探索了它们的信息含量,或者更具体地说,它们提供大量独特模式的能力,这些模式可以用作一种新的物品识别形式。简要总结了分形及其维数,并将其应用于众所周知的扩散限制聚集体(DLA)树枝状结构。探讨了通过电化学“自组装”形成的树枝状物,并给出了它们在不同条件下形成的例子。构成这些分形的自相似Y形符号的随机变化可以携带信息,导致显著的熵,尽管整体模式的结构熵相对较小。
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引用次数: 3
Manipulation of matter with shaped-pulse light field and its applications 整形脉冲光场对物质的操纵及其应用
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1949390
Hongxia Qi, Zhenzhong Lian, De-hou Fei, Zhou Chen, Zhan Hu
ABSTRACT This review focuses on the properties of the light fields that are more useful in applications. We review recent means of generating shaped-pulse light field, by which matters can be steered toward the desired products, thereby allowing the coherent control in terms of effectiveness, selectivity and manipulation. Applications of these light fields are discussed, including bioscience, laser machining, novel material fabrication, trace material detection and military. Graphical Abstract
摘要本文综述了在应用中更有用的光场的性质。我们回顾了最近产生成形脉冲光场的方法,通过这种方法可以将物质导向所需的产物,从而在有效性、选择性和操纵性方面实现相干控制。讨论了这些光在生物科学、激光加工、新型材料制造、痕量材料检测和军事等领域的应用。图形摘要
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引用次数: 3
Dusty plasmas: from Saturn’s rings to semiconductor processing devices 尘埃等离子体:从土星环到半导体处理设备
IF 6 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.1080/23746149.2021.1873859
R. Merlino
ABSTRACT Dusty plasmas are plasmas containing solid particles in the size range of about 10 nm—10 μm. The particles acquire an electrical charge by collecting electrons and ions from the plasma, or by photo-electron emission if they are exposed to UV radiation. The charged dust particles interact with the electrons and ions, forming a multi-component plasma. Dusty plasmas occur in a number of natural environments, including planetary rings, comet tails, and solar nebulae; as well as in technological devices used to manufacture semiconductor chips, and in magnetic fusion devices. This article focuses on the physics underlying dusty plasmas, which are studied by plasma physicists, aeronomists, space physicists, and astrophysicists. The article begins with an introduction explaining what we mean by a dusty plasma, where they are found, and a summary of their basic properties. The article then presents the fundamental physics of dust charging, forces on dust particles, a description of devices used to produce dusty plasmas, strongly coupled dusty plasmas, collective phenomenon (waves) in dusty plasmas, magnetized dusty plasmas, and the emerging technologies based on dusty plasmas. It concludes with a few perspective comments on how the field has developed historically and the prospects for future advances. Graphical abstract
摘要尘埃等离子体是指含有尺寸在10纳米-10微米之间的固体颗粒的等离子体。粒子通过从等离子体中收集电子和离子来获得电荷,或者如果暴露在紫外线辐射下,则通过光电子发射来获得电荷。带电尘埃粒子与电子和离子相互作用,形成多组分等离子体。尘埃等离子体出现在许多自然环境中,包括行星环、彗星尾和太阳星云;以及用于制造半导体芯片的技术装置和磁聚变装置。这篇文章的重点是尘埃等离子体的物理基础,等离子体物理学家、航空学家、空间物理学家和天体物理学家都在研究尘埃等离子体。这篇文章首先介绍了我们所说的尘埃等离子体的含义,它们是在哪里发现的,并总结了它们的基本性质。然后,文章介绍了尘埃带电的基本物理、尘埃粒子上的力、用于产生尘埃等离子体的设备的描述、强耦合尘埃等离子体、尘埃等离子体中的集体现象(波)、磁化尘埃等离子体以及基于尘埃等离子体的新兴技术。最后,对该领域的历史发展和未来发展前景进行了一些前瞻性评论。图形摘要
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引用次数: 18
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