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arXiv 2023年

作者： Sun, Wei Zhang, Pei-Pei Zhou, Peng-Peng Chen, Shao-Long Zhou, Zhi-Qiang Huang, Yao Qi, Xiao-Qiu Yan, Zong-Chao Shi, Ting-Yun Drake, G.W.F. Zhong, Zhen-Xiang Guan, Hua Gao, Ke-Lin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China Key Laboratory of Atomic Frequency Standards Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China Department of Physics University of New Brunswick FrederictonNBE3B 5A3 Canada Department of Physics University of Windsor WindsorONN9B 3P4 Canada University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Optical Field Manipulation of Zhejiang Province and Physics Department of Zhejiang Sci-Tech University Hangzhou310018 China

We investigate the 2 3S1–2 3PJ (J = 0, 1, 2) transitions in 6Li+ using the optical Ramsey technique and achieve the most precise values of the hyperfine splittings of the 2 3S1 and 2 3PJ states, with smallest uncertainty of about 10 kHz. The present results reduce the uncertainties of previous experiments by a factor of 5 for the 2 3S1 state and a factor of 50 for the 2 3PJ states, and are in better agreement with theoretical values. Combining our measured hyperfine intervals of the 2 3S1 state with the latest quantum electrodynamic (QED) calculations, the improved Zemach radius of the 6Li nucleus is determined to be 2.44(2) fm, with the uncertainty entirely due to the uncalculated QED effects of order mα7. The result is in sharp disagreement with the value 3.71(16) fm determined from simple models of the nuclear charge and magnetization distribution. We call for a more definitive nuclear physics value of the 6Li Zemach radius. Copyright © 2023, The Authors. All rights reserved.

关键词： Electrodynamics

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Observation of Weyl point pair annihilation in a gyromagnetic photonic crystal

arXiv

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arXiv 2021年

作者： Liu, Gui-Geng Gao, Zhen Zhou, Peiheng Wang, Qiang Hu, Yuan-Hang Wang, Maoren Liu, Chengqi Lin, Xiao Yang, Shengyuan A. Yang, Yihao Chong, Yidong Zhang, Baile Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Department of Electrical and Electronic Engineering South University of Science and Technology Shenzhen518055 China National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu610054 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center Zhejiang University Hangzhou310027 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

Weyl semimetals are gapless three-dimensional (3D) phases whose bandstructures contain Weyl point (WP) degeneracies1. WPs carry topological charge and can only be eliminated by mutual annihilation, a process that generates the various topologically distinct 3D insulators1,2. Time reversal (T) symmetric Weyl phases, containing a minimum of four WPs, have been extensively studied in real materials3,4, photonic metamaterials5,6, and other systems. Weyl phases with a single WP pair – the simplest configuration of WPs – are more elusive as they require T-breaking7. Here, we implement a microwave-scale gyromagnetic 3D photonic crystal, and use field-mapping experiments to track a single pair of ideal WPs whose momentum space locations depend strongly on the biasing magnetic field. By continuously varying the field strength, we observe the annihilation of the WPs, and the formation of a 3D Chern insulator2,8,9, a previously unrealised member of the family of 3D topological insulators (TIs). Surface measurements show, in unprecedented detail, how the Fermi arc states connecting the WPs evolve into TI surface states. Copyright © 2021, The Authors. All rights reserved.

关键词： Photonic crystals

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Demonstration of broadband topological slow light

arXiv

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arXiv 2022年

作者： Chen, Fujia Xue, Haoran Pan, Yuang Wang, Maoren Hu, Yuanhang Zhang, Li Chen, Qiaolu Han, Song Liu, Gui-Geng Gao, Zhen Zhou, Peiheng Yin, Wenyan Chen, Hongsheng Zhang, Baile Yang, Yihao Interdisciplinary Center for Quantum Information State Key Lab. of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang ZJU-UIUC Institute Zhejiang University Hangzhou310027 China Jinhua Institute of Zhejiang University Zhejiang University Jinhua321099 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China

Slow-light devices are able to significantly enhance light-matter interaction due to the reduced group velocity of light, but a very low group velocity is usually achieved in a narrow bandwidth, accompanied by extreme sensitivity to imperfections that causes increased disorder-induced attenuation. Recent theories have suggested an ideal solution to this problem—unidirectional chiral photonic states, previously discovered in structures known as photonic topological insulators, not only resist backscattering from imperfections but can also be slowed down in the entire topological bandgap with multiple windings in the Brillouin zone. Here, we report on the experimental demonstration of broadband topological slow light in a photonic topological insulator. When coupled with periodic resonators that form flat bands, the chiral photonic states can wind many times around the Brillouin zone, achieving an ultra-low group velocity in the entire topological bandgap. This demonstration extends the scope of topological photonics into slow light engineering, and opens a unique avenue in the dispersion manipulation of chiral photonic states. © 2022, CC BY.

关键词： Slow light

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Transforming heat transfer with thermal metamaterials and devices

arXiv

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arXiv 2020年

作者： Li, Ying Li, Wei Han, Tiancheng Zheng, Xu Li, Jiaxin Li, Baowen Fan, Shanhui Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Department of Physics University of Colorado BoulderCO80309 United States School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Paul M. Rady Department of Mechanical Engineering University of Colorado BoulderCO80309 United States

| The demand for sophisticated tools and approaches in heat management and control has triggered fast development of emerging fields including conductive thermal metamaterials, nanophononics, far-field and near-field radiative thermal management, etc. In this review, we cast a unified perspective on the control of heat transfer, based on which the related studies can be considered as complementary paradigms toward manipulating physical parameters and realizing unprecedented phenomena in heat transfer using artificial structures, such as thermal conductivity in heat conduction, thermal emissivity in radiation, and properties related to multi-physical effects. The review is divided into three parts that focus on the three main categories of heat flow control, respectively. Thermal conduction and radiation are emphasized in the first and second parts at both macro- and micro-scale. The third part discusses the efforts to actively introduce heat sources or tune the material parameters with multi-physical effects in both conduction and radiation, including works using thermal convection. We conclude the review with challenges in this research topic and new possibilities about topological thermal effects, heat waves, and quantum thermal effects. Copyright © 2020, The Authors. All rights reserved.

关键词： Metamaterials

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New Ga63(p,γ)Ge64 and Ge64(p,γ)As65 reaction rates corresponding to the temperature regime of thermonuclear x-ray bursts

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Physical Review C 2024年第6期110卷 065804-065804页

作者： Ning Lu (盧寧) Yi Hua Lam (藍乙華) Alexander Heger Zi Xin Liu (刘子鑫) Hidetoshi Yamaguchi (山口英斉) CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Astrophysical Big Bang Laboratory (ABBL) Cluster for Pioneering Research RIKEN Wako Saitama 351-0198 Japan Present address: Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University 310018 Hangzhou China. School of Physics and Astronomy Monash University Vic 3800 Australia OzGrav-Monash – Monash Centre for Astrophysics School of Physics and Astronomy Monash University Vic 3800 Australia Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) School of Physics and Astronomy Monash University Vic 3800 Australia Joint Institute for Nuclear Astrophysics Michigan State University East Lansing Michigan 48824 USA Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000 China Center for Nuclear Study (CNS) the University of Tokyo RIKEN campus 2-1 Hirosawa Wako Saitama 351-0198 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo 181-8588 Japan

We compute the Ga63(p,γ)Ge64 and Ge64(p,γ)As65 thermonuclear reaction rates using the latest experimental input supplemented with theoretical nuclear spectroscopic information. The experimental input consists of the latest proton thresholds of Ge64 and As65 and the nuclear spectroscopic information of As65, whereas the theoretical nuclear spectroscopic information for Ge64 and As65 are deduced from the full pf-shell space configuration-interaction shell-model calculations with the GXPF1A Hamiltonian. Both thermonuclear reaction rates are determined with known uncertainties at the energies that correspond to the Gamow windows of the temperature regime relevant to type I x-ray bursts, covering the typical temperature range of the thermonuclear runaway of the GS 1826−24 periodic bursts and SAX J1808.4−3658 photospheric radius expansion bursts.

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optically controlled Femtosecond Polariton Switch at Room Temperature

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Physical Review Letters 2022年第5期129卷 057402-057402页

作者： Fei Chen Hui Li Hang Zhou Song Luo Zheng Sun Ziyu Ye Fenghao Sun Jiawei Wang Yuanlin Zheng Xianfeng Chen Huailiang Xu Hongxing Xu Tim Byrnes Zhanghai Chen Jian Wu State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200241 China Department of Physics College of Physical Science and Technology Xiamen University Xiamen 361005 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan 250358 China Division of Arts and Sciences New York University Shanghai 1555 Century Ave Pudong New District Shanghai 200122 China NYU-ECNU Institute of Physics at NYU Shanghai 3663 Zhongshan Road North Shanghai 200062 China Center for Quantum and Topological Systems (CQTS) NYUAD Research Institute New York University Abu Dhabi UAE Department of Physics New York University New York New York 10003 USA Wuhan National High Magnetic Field Center Wuhan 430074 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800 China

Exciton polaritons have shown great potential for applications such as low-threshold lasing, quantum simulation, and dissipation-free circuits. In this paper, we realize a room temperature ultrafast polaritonic switch where the Bose-Einstein condensate population can be depleted at the hundred femtosecond timescale with high extinction ratios. This is achieved by applying an ultrashort optical control pulse, inducing parametric scattering within the photon part of the polariton condensate via a four-wave mixing process. Using a femtosecond angle-resolved spectroscopic imaging technique, the erasure and revival of the polariton condensates can be visualized. The condensate depletion and revival are well modeled by an open-dissipative Gross-Pitaevskii equation including parametric scattering process. This pushes the speed frontier of all-optical controlled polaritonic switches at room temperature towards the THz regime.

关键词： Exciton polariton Optoelectronics Ultrafast phenomena

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