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On roads less travelled between AI and computational science 人工智能与计算科学之间的少有人走的路
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-05-13 DOI: 10.1038/s42254-024-00726-z
Petros Koumoutsakos
Computational science and artificial intelligence have been drivers and benefactors of advances in algorithms and hardware, each in different ways, and originally with different targets. Petros Koumoutsakos argues that the intellectual space between these two fields is home to exciting opportunities for scientific discovery. Petros Koumoutsakos argues that the intellectual space between AI and computational science is home to exciting opportunities for scientific discovery.
计算科学和人工智能既是算法和硬件进步的推动者,也是其受益者,两者的方式不同,最初的目标也不同。Petros Koumoutsakos 认为,这两个领域之间的知识空间蕴藏着令人兴奋的科学发现机会。Petros Koumoutsakos 认为,人工智能和计算科学之间的知识空间蕴藏着令人兴奋的科学发现机会。
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引用次数: 0
Physics does not exist in a vacuum 物理学并非存在于真空中
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-05-09 DOI: 10.1038/s42254-024-00723-2
Doing physics and being a physicist is shaped by complex social factors. This month, we launch a Collection to explore the social and historical context of physics research.
从事物理研究和成为物理学家都受到复杂社会因素的影响。本月,我们将推出一本探索物理学研究的社会和历史背景的文集。
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引用次数: 0
Entropy, irreversibility and inference at the foundations of statistical physics 熵、不可逆和推理是统计物理学的基础
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-05-01 DOI: 10.1038/s42254-024-00720-5
Jonathan Asher Pachter, Ying-Jen Yang, Ken A. Dill
Statistical physics relates the properties of macroscale systems to the distributions of their microscale agents. Its central tool has been the maximization of entropy, an equilibrium variational principle. Recent work has sought extensions to non-equilibria: across processes of change both fast and slow, in the Jarzynski equality and fluctuation relations and other tools of stochastic thermodynamics, using large deviation theory or others. When recognized as an inference principle, entropy maximization can be generalized for non-equilibria and applied to path entropies rather than state entropies, becoming the principle of maximum caliber, which we emphasize in this Review. Our primary goal is to enhance crosstalk among researchers working in disparate silos, comparing and contrasting different approaches while pointing to common roots. Entropy is central to statistical physics, but it has multiple meanings. This Review clarifies the strengths of each use and the connections between them, seeking to bolster crosstalk between researchers and to emphasize the power of inference for non-equilibrium physics.
统计物理学将宏观系统的特性与其微观介质的分布联系起来。其核心工具是熵的最大化,这是一个平衡变分原理。最近的研究试图将其扩展到非平衡状态:跨越快速和缓慢的变化过程、贾钦斯基平等和波动关系以及随机热力学的其他工具,使用大偏差理论或其他工具。当认识到熵最大化是一种推理原则时,它可以被推广到非平衡状态,并应用于路径熵而非状态熵,成为最大口径原则,这也是我们在本评论中所强调的。我们的主要目标是加强在不同孤岛工作的研究人员之间的交流,比较和对比不同的方法,同时指出共同的根源。
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引用次数: 0
Dipolar many-body complexes and their interactions in stacked 2D heterobilayers 叠层二维异质膜中的双极多体复合物及其相互作用
IF 44.8 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-29 DOI: 10.1038/s42254-024-00721-4
Xueqian Sun, Ermin Malic, Yuerui Lu
In the past decade, dipolar many-body complexes have been observed in 2D van der Waals heterobilayers. These complexes show compelling dipolar characteristics such as long-range and anisotropic interactions among dipoles, and their high tunability and long coherence time make them promising for applications in quantum information processing and optoelectronic devices. The presence of powerful dipole–dipole interactions among long-lived interlayer excitons can cause the system to enter unique classical and quantum phases with multiparticle correlations, which can host rich many-body physics such as dipolar liquids, dipolar crystals and superfluids. The strong binding energy of interlayer excitons in 2D heterobilayers enhances the critical temperature of these exotic phenomena. In this Review, we discuss recent work on dipolar complexes and many-body effects in transition metal dichalcogenide double layers and present potential opportunities in the field. Dipolar many-body systems provide a promising platform to study quantum phases and exotic phenomena such as dipolar liquids, dipolar solids and superfluids. This Review discusses dipolar many-body complexes and their interactions in 2D stacked transition metal dichalcogenide heterobilayers and offers insights into the unique properties of various exciton species.
在过去十年中,人们在二维范德瓦尔斯异质层中观察到了偶极多体复合物。这些复合物显示出令人信服的偶极特性,例如偶极子之间的长程和各向异性相互作用,而且它们的可调谐性高、相干时间长,因此在量子信息处理和光电器件中很有应用前景。长寿命层间激子之间存在强大的偶极子-偶极子相互作用,可使系统进入具有多粒子相关性的独特经典和量子相,从而孕育出丰富的多体物理学,如偶极液体、偶极晶体和超流体。二维异质层中层间激子的强结合能提高了这些奇异现象的临界温度。在本综述中,我们将讨论有关过渡金属二掺杂双层中偶极复合物和多体效应的最新研究成果,并介绍该领域的潜在机遇。
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引用次数: 0
Future of 99Mo reactor-independent supply 独立于反应堆的 99Mo 供应的未来
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-25 DOI: 10.1038/s42254-024-00716-1
Antonino Pietropaolo, Marco Capogni, Lina Quintieri
Molybdenum-99 is essential for nuclear medicine, being the parent radionuclide of 99mTc, which is commonly used in single-photon-emission computed tomography scans. Worldwide, the supply of 99Mo has faced considerable disruption twice in recent years: in 2009 triggered by the unexpected simultaneous shutdown of two nuclear research reactors, and in 2020 because of disruption to shipments of 99Mo as a consequence of severe restrictions on flights. This Perspective therefore examines alternative means of 99Mo production, via cyclotrons, electron linear accelerators and fusion neutron sources. The research and development of methods for 99Mo that can be synergic and complementary to reactors in the short-to-medium term and alternative to them in the long term is strategic for addressing potential global events that might produce reduced access to healthcare procedures relying on diagnostic as well as therapeutic radionuclides. This Perspective argues that the development of 99Mo production methods complementary to reactor-based methodology is strategic in the short-to-medium term. Localized and resilient 99Mo production routes might guarantee access to important diagnostic procedures even in the case of unpredictable global events.
钼-99 对核医学至关重要,它是 99mTc 的母体放射性核素,常用于单光子发射计算机断层扫描。近年来,全球 99Mo 的供应两次受到严重干扰:2009 年,两个核研究反应堆意外同时关闭;2020 年,由于航班受到严格限制,99Mo 的运输受到干扰。因此,本《视角》研究了通过回旋加速器、电子直线加速器和聚变中子源生产99Mo的替代方法。99Mo 的生产方法在中短期内可与反应堆协同互补,在长期内则可替代反应堆,研究和开发这种方法对于解决潜在的全球性事件具有战略意义,这些事件可能会减少依赖诊断和治疗放射性核素的医疗程序。本视角认为,从中短期来看,开发与反应堆方法互补的 99Mo 生产方法具有战略意义。即使发生不可预测的全球事件,本地化和具有弹性的 99Mo 生产路线也能保证重要诊断程序的可及性。
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引用次数: 0
How the unlikely friendship of Pauli and Jung led to the discovery of CPT symmetry 保利和荣格之间不可能的友谊如何促成了 CPT 对称性的发现
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-19 DOI: 10.1038/s42254-024-00722-3
Arthur I. Miller
In 1931, the psychoanalyst Carl Jung took on an unusual patient, the brilliant young physicist, Wolfgang Pauli. Arthur I. Miller tells the story of their friendship, how they impacted each other’s work, and reflects on creativity.
1931 年,精神分析学家卡尔-荣格收治了一位不同寻常的病人--才华横溢的年轻物理学家沃尔夫冈-泡利。亚瑟-米勒(Arthur I. Miller)讲述了他们之间的友谊、他们如何影响彼此的工作以及对创造力的思考。
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引用次数: 0
Fractionalized electrons in moiré materials 摩尔纹材料中的分化电子
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-16 DOI: 10.1038/s42254-024-00718-z
Nicolás Morales-Durán, Jingtian Shi, A. H. MacDonald
In the 1980s, the discovery of electron states that fractionalize in the presence of a time-reversal symmetry breaking magnetic field opened up new directions in condensed matter physics. In 2023, evidence has accumulated that a version of these states in which the time-reversal symmetry breaking is spontaneous appears in moiré materials.
20 世纪 80 年代,电子态的发现为凝聚态物理学开辟了新的方向。2023 年,有证据表明,这些状态的一个版本--时间反转对称破缺是自发的--出现在摩尔材料中。
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引用次数: 0
Orbital angular momentum lasers 轨道角动量激光器
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-16 DOI: 10.1038/s42254-024-00715-2
Andrew Forbes, Light Mkhumbuza, Liang Feng
Light can be tailored to carry angular momentum well beyond the restriction of its two spin states, left- and right-circularly polarized light, by imbuing it with orbital angular momentum (OAM). OAM is controlled by imparting finer and finer azimuthal phase gradients, twisting the wavefront ever tighter in one of two helicities, clockwise or anticlockwise. This can be done directly within a laser — OAM lasers — by imprinting an intracavity twist on the circulating light, but it requires judicious laser cavity design to break nature’s angular momentum degeneracy. Without this, the laser produces equal measures of both helicities, for no net OAM. We review the physics of OAM lasers, covering diverse symmetry-breaking approaches such as gain or loss control, asymmetric cavity geometries and geometric phase control. Structured matter allows this symmetry breaking to be done at the microscale and nanoscale, for OAM lasers based on topological matter, photonic crystals and optical breaking of chiral symmetry in microring cavities, as well as leveraging non-Hermitian photonic design at exceptional points. The exciting prospect of using structured matter to engineer twisted light is discussed along with the opportunities and challenges ahead. This Review covers the intriguing physics behind orbital angular momentum lasers, summarizing the exciting prospects at the interface between structured light and structured matter.
通过赋予光以轨道角动量(OAM),可以使其携带的角动量远远超出其两种自旋状态(左旋和右旋偏振光)的限制。控制轨道角动量的方法是施加越来越细的方位角相位梯度,使波面在顺时针或逆时针两个螺旋中的一个螺旋中扭转得越来越紧。这可以直接在激光器(OAM 激光器)中实现,方法是在循环光上印上腔内扭曲,但这需要明智的激光腔设计,以打破自然界的角动量退化。如果不这样做,激光器就会产生等量的两种螺旋,而不会产生净OAM。我们回顾了 OAM 激光器的物理学原理,包括各种打破对称性的方法,如增益或损耗控制、非对称腔体几何结构和几何相位控制。结构物质允许在微米和纳米尺度上打破对称性,用于基于拓扑物质、光子晶体和微孔腔中手性对称性的光学打破的 OAM 激光器,以及在特殊点上利用非赫米提光子设计。本文讨论了利用结构物质来设计扭曲光这一令人兴奋的前景,以及未来的机遇和挑战。
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引用次数: 0
Quantum sensing for particle physics 粒子物理学量子传感
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-16 DOI: 10.1038/s42254-024-00714-3
Steven D. Bass, Michael Doser
Quantum sensing uses properties of quantum mechanics to go beyond what is possible with traditional measurement techniques. In particle physics, key problems in which quantum sensing can have a vital role include neutrino properties, tests of fundamental symmetries (Lorentz invariance and the equivalence principle, searches for electric dipole moments and possible variations of the fundamental constants), the search for dark matter and testing ideas about the nature of dark energy. Quantum sensor technologies using atom interferometry, optomechanical devices, or atomic and nuclear clocks are inherently relevant for low-energy physics, but other platforms, such as quantum dots, superconducting devices or spin sensors, might also be useful in future high-energy particle physics detectors. This Perspective explores the opportunities for these technologies in future particle physics experiments and outlines the challenges that could be tackled through collaborative efforts. Quantum sensing exploits properties of quantum systems to go beyond what is possible with traditional measurement techniques, hence opening exciting opportunities in both low-energy and high-energy particle physics experiments.
量子传感利用量子力学的特性,超越了传统测量技术的可能性。在粒子物理学中,量子传感可以发挥重要作用的关键问题包括中微子特性、基本对称性测试(洛伦兹不变性和等效原理、电偶极矩搜索和基本常数的可能变化)、暗物质搜索和暗能量性质的测试。使用原子干涉测量法、光机械装置或原子钟和核钟的量子传感器技术本质上与低能物理相关,但量子点、超导装置或自旋传感器等其他平台也可能在未来的高能粒子物理探测器中发挥作用。本 "视角 "探讨了这些技术在未来粒子物理实验中的机遇,并概述了可通过合作努力应对的挑战。
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引用次数: 0
Physical insights into non-fullerene organic photovoltaics 非富勒烯有机光伏技术的物理启示
IF 38.5 1区 物理与天体物理 Q1 PHYSICS, APPLIED Pub Date : 2024-04-15 DOI: 10.1038/s42254-024-00719-y
Jiayu Wang, Yuan Xie, Kai Chen, Hongbin Wu, Justin M. Hodgkiss, Xiaowei Zhan
Boosted by the fast development of non-fullerene acceptors, organic photovoltaics (OPVs) have achieved breakthrough power conversion efficiencies — in excess of 20% and approaching those of state-of-the-art crystalline silicon photovoltaics. New physical properties, unusual phenomena and critical mechanisms have been uncovered in non-fullerene acceptors and related devices, all contributing to deliver advances in OPV technologies. In this Review, we summarize the photophysics and device physics of non-fullerene-acceptor-based OPVs, with emphasis on the comparison between fullerene and non-fullerene acceptors of the physical processes that affect device performance. We discuss the processes of exciton generation, diffusion, transport and separation and charge recombination in OPVs and present recent interpretations of the physics of non-fullerene-acceptor-based OPVs, looking at how driving energy affects exciton separation and how charge recombination affects voltage loss. Compiling these mechanisms — especially those that can overcome the intrinsic limitations imposed by the energy-gap law — we provide a strategy for minimizing voltage loss and discuss future research directions and challenges in the fundamentals and performance of OPVs, including new modes of operation for non-fullerene-acceptor-based OPVs. Non-fullerene acceptors have boosted the development of organic photovoltaics. This Review highlights the photophysics and device physics of non-fullerene organic photovoltaics, including exciton generation, diffusion, transport, separation and charge recombination.
在非富勒烯受体快速发展的推动下,有机光伏技术(OPV)实现了突破性的功率转换效率--超过 20%,接近最先进的晶体硅光伏技术。在非富勒烯受体和相关设备中发现了新的物理性质、不寻常现象和关键机制,这些都有助于实现 OPV 技术的进步。在本综述中,我们总结了基于非富勒烯受体的 OPV 的光物理和器件物理,重点比较了富勒烯和非富勒烯受体中影响器件性能的物理过程。我们讨论了 OPV 中激子产生、扩散、传输和分离以及电荷重组的过程,并介绍了对基于非富勒烯受体的 OPV 物理的最新解释,研究了驱动能量如何影响激子分离以及电荷重组如何影响电压损耗。综合这些机制(尤其是那些能够克服能隙定律所带来的内在限制的机制),我们提出了将电压损耗降至最低的策略,并讨论了未来在 OPV 基本原理和性能方面的研究方向和挑战,包括基于非富勒烯受体的 OPV 的新工作模式。
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Nature Reviews Physics
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