Science China Physics, Mechanics & Astronomy最新文献_第3页

Dust processing in the terrestrial planet-forming region of the PDS 70 disk PDS 70盘类地行星形成区的尘埃处理

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-20 DOI: 10.1007/s11433-024-2597-5

Yao Liu, Dafa Li, Hongchi Wang, Haoran Feng, Min Fang, Fujun Du, Thomas Henning, Giulia Perotti

{"title":"Dust processing in the terrestrial planet-forming region of the PDS 70 disk","authors":"Yao Liu, Dafa Li, Hongchi Wang, Haoran Feng, Min Fang, Fujun Du, Thomas Henning, Giulia Perotti","doi":"10.1007/s11433-024-2597-5","DOIUrl":"10.1007/s11433-024-2597-5","url":null,"abstract":"<div><p>Dust grains in protoplanetary disks are the building blocks of planets. Investigating the dust composition and size, and their variation over time, is crucial for understanding the planet formation process. The PDS 70 disk is so far the only protoplanetary disk with concrete evidence for the presence of young planets. Mid-infrared spectra were obtained for PDS 70 by the Infrared Spectrograph (IRS) on the Spitzer Space Telescope (SST) and the Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope (JWST) in 2007 and 2022, respectively. In this work, we investigate the dust mineralogy through a detailed decomposition of the observed mid-infrared spectra. The results show that both the dust size and crystallinity increased by a factor of about two during the two epochs of observation, indicating evident dust processing in the terrestrial planet-forming region of the PDS 70 disk. The dust size (∼ 0.8 µm) and crystallinity (∼ 6%) in the PDS 70 disk are similar to those of other disks, which implies that the two nascent planets, PDS 70b and PDS 70c located at radial distances of ∼ 22 AU and ∼ 34 AU, do not have a significant impact on the dust processing in the inner disk. The flux densities at λ ≿ 16 µm measured by JWST/MIRI are only 60% of those obtained by Spitzer/IRS. Based on self-consistent radiative transfer modeling, we found that such a strong variability in mid-infrared fluxes can be produced by adjustments to the dust density distribution and structure of the inner disk probably induced by planet-disk interaction.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Innovations in quantum light sources advance entanglement-based QKD networks 量子光源的创新推进了基于纠缠的量子密钥分配网络

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-20 DOI: 10.1007/s11433-025-2643-x

Wei Zhang

引用次数: 0

Observations of a peculiar coronal wave inside a pseudo-streamer structure 伪流光结构内奇特日冕波的观测

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-20 DOI: 10.1007/s11433-024-2610-y

Jun Li, Ruisheng Zheng, Xiaoqian Wang, Yao Chen

{"title":"Observations of a peculiar coronal wave inside a pseudo-streamer structure","authors":"Jun Li, Ruisheng Zheng, Xiaoqian Wang, Yao Chen","doi":"10.1007/s11433-024-2610-y","DOIUrl":"10.1007/s11433-024-2610-y","url":null,"abstract":"<div><p>Coronal extreme ultraviolet (EUV) waves are large-scale disturbances propagating in the corona and are closely associated with solar eruptions. They can disturb the ambient plasma over a wide temperature range, resulting in simultaneous observations in multiple EUV passbands, and the wavefronts are typically best observed in AIA 193 and 211 Å channels with temperatures ranging from 1.6 to 2 MK. Here, we report a peculiar EUV wave that was invisible in the 193 and 211 Å but appeared instead in AIA 171 Å, corresponding to a lower temperature. Driven by a coronal jet, the wave propagated at a speed of ∼560 km s<sup>−1</sup>. The differential emission measure (DEM) analysis shows that the emission of the wavefront concentrated at ∼1.25 MK, lower than the typical predominant temperatures. In addition, the fields extrapolated using the potential field source surface (PFSS) method indicate the existence of a typical pseudo-streamer structure. Hence, we propose that it is possibly the first case of an EUV wave occurring and propagating inside a pseudo-streamer, and its visibility is likely determined by the relatively cooler plasma within the pseudo-streamer.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

U(1) Dirac quantum spin liquid candidate in triangular-lattice antiferromagnet CeMgAl11O19 三角形晶格反铁磁体CeMgAl11O19中的U(1) Dirac量子自旋液体候选体

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-20 DOI: 10.1007/s11433-024-2634-9

Yantao Cao, Akihiro Koda, M. D. Le, V. Pomjakushin, Benqiong Liu, Zhendong Fu, Zhiwei Li, Jinkui Zhao, Zhaoming Tian, Hanjie Guo

{"title":"U(1) Dirac quantum spin liquid candidate in triangular-lattice antiferromagnet CeMgAl11O19","authors":"Yantao Cao, Akihiro Koda, M. D. Le, V. Pomjakushin, Benqiong Liu, Zhendong Fu, Zhiwei Li, Jinkui Zhao, Zhaoming Tian, Hanjie Guo","doi":"10.1007/s11433-024-2634-9","DOIUrl":"10.1007/s11433-024-2634-9","url":null,"abstract":"<div><p>Quantum spin liquid represents an intriguing state where electron spins are highly entangled yet spin fluctuation persists even at 0 K. Recently, the hexaaluminates <i>R</i>MgAl<sub>11</sub>O<sub>19</sub> (<i>R</i> = rare earth) have been proposed to be a platform for realizing the quantum spin liquid state with dominant Ising anisotropic correlations. Here, we report detailed low-temperature magnetic susceptibility, muon spin relaxation, and thermodynamic studies on the CeMgAl<sub>11</sub>O<sub>19</sub> single crystal. Ising anisotropy is revealed by magnetic susceptibility measurements. Muon spin relaxation and ac susceptibility measurements rule out any long-range magnetic ordering or spin freezing down to 50 mK despite the onset of spin correlations below ∼0.8 K. Instead, the spins keep fluctuating at a rate of 1.0(2) MHz at 50 mK. Specific heat results indicate a gapless excitation with a power-law dependence on temperature, <i>C</i><sub><i>m</i></sub>(<i>T</i>) ∝ <i>T</i><sup><i>α</i></sup>. The quasi-quadratic temperature dependence with <i>α</i> = 2.28(4) in zero field and linear temperature dependence in 0.25 T support the possible realization of the U(1) Dirac quantum spin liquid state.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11433-024-2634-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New theoretical information for hybrid meson search 混合介子搜索的新理论信息

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-025-2617-9

Beijiang Liu

引用次数: 0

Superconducting states in La3Ni2O7 with a parallel magnetic field 具有平行磁场的 La3Ni2O7 中的超导态

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-024-2632-5

Tianyang Xie, Wei Zhu

引用次数: 0

Flow pattern and wave propagation induced by local energy deposition at droplet surface 液滴表面局部能量沉积诱导的流动模式和波传播

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-024-2604-6

Zhu-Jun Li, Yi Shen, Hang Ding

{"title":"Flow pattern and wave propagation induced by local energy deposition at droplet surface","authors":"Zhu-Jun Li, Yi Shen, Hang Ding","doi":"10.1007/s11433-024-2604-6","DOIUrl":"10.1007/s11433-024-2604-6","url":null,"abstract":"<div><p>Interaction between metallic droplets and picosecond laser pre-pulse can shape the droplet into a target more favorable for the main pulse to efficiently generate extreme ultraviolet (EUV) light for nanolithography. After the radiation of the pre-pulse, flow pattern and wave propagation in the droplet are responsible for the deformation and fragmentation of the droplet at a late time. In this study, we numerically investigate the acoustic response and dynamic behaviors of a droplet subjected to a localized heat pulse in the vicinity of the droplet surface, which models the energy deposition of a picosecond (ps) laser pre-pulse. A second-order conservative sharp interface method is adopted to simulate corresponding compressible inviscid two-phase flows. Based on the numerical results, we find that a wave structure of compression-expansion-compression waves propagates in the spherical droplet, and that the asymmetry of the heat source around the droplet surface accounts for the occurrence of the secondary compression wave. Then, we assess the occurrence and propagation of the wave structures, and correlate the wave amplitude with the intensity of the deposited energy. In particular, a theoretical model for the wave propagation is established under the small perturbation assumption, and indicates that the minimum pressure should be inversely proportional to its distance to the droplet center. This theoretical prediction is in good agreement with the numerical results with low intensity of heat source. With the increase of intensity of heat source, the numerical results gradually deviate from the theoretical prediction, because of the failure of the small perturbation assumption at high deposition energy and the effect of asymmetry in geometry on the wave propagation. This study provides an insight into the physical mechanisms of a droplet radiated by a ps laser pulse, which may be helpful in designing the desirable target for efficient laser-induced EUV light generation.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A 316 stainless steel rod impacts with a rigid flat: Theory, experiment, and numerical simulation 316不锈钢杆与刚性平面的冲击：理论、实验和数值模拟

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-024-2611-9

Yifan Wang, Xuan Ye, Hao Yan, Tao Wang, Guangyan Huang, Zhuo Zhuang

{"title":"A 316 stainless steel rod impacts with a rigid flat: Theory, experiment, and numerical simulation","authors":"Yifan Wang, Xuan Ye, Hao Yan, Tao Wang, Guangyan Huang, Zhuo Zhuang","doi":"10.1007/s11433-024-2611-9","DOIUrl":"10.1007/s11433-024-2611-9","url":null,"abstract":"<div><p>A slender rod suffers global vibration in impact. In this study, we present the experimental, numerical, and theoretical studies of the axial responses of a 316 stainless steel rod during vertical impact with a rigid flat. Combining the contact models and the one-dimensional (1D) wave equation, we first develop a semi-analytical vertical impact model for the rods based on a unified theoretical framework, which considers different geometries of the impacting end including the hemispherical nose, the truncated conical nose, and the flat end. Furthermore, we perform free-drop experiments on these rods and numerical simulations to verify the theoretical models. The results show that the strain-rate effect hardens the rod nose and should not be ignored even at a velocity as low as a few meters per second. After the proposal of a dynamic correction factor to adjust the quasi-static contact model, the theoretical, numerical, and experimental results agree well with one another. Also, the three-dimensional (3D) FEM simulations show that the slight deviations between the experimental and the predicted results are due to the slight obliqueness of the rods in the drop. Additionally, we leverage the theoretical tool and FEM simulations to compare the mechanical responses of rods with different impacting ends, and suggestions about the selection of rod noses are obtained.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoemission evidence of a novel charge order in kagome metal FeGe kagome金属FeGe中一种新电荷序的光发射证据

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-024-2636-9

Zhisheng Zhao, Tongrui Li, Peng Li, Xueliang Wu, Jianghao Yao, Ziyuan Chen, Yajun Yan, Shengtao Cui, Zhe Sun, Yichen Yang, Zhicheng Jiang, Zhengtai Liu, Alex Louat, Timur Kim, Cephise Cacho, Aifeng Wang, Yilin Wang, Dawei Shen, Juan Jiang, Donglai Feng

{"title":"Photoemission evidence of a novel charge order in kagome metal FeGe","authors":"Zhisheng Zhao, Tongrui Li, Peng Li, Xueliang Wu, Jianghao Yao, Ziyuan Chen, Yajun Yan, Shengtao Cui, Zhe Sun, Yichen Yang, Zhicheng Jiang, Zhengtai Liu, Alex Louat, Timur Kim, Cephise Cacho, Aifeng Wang, Yilin Wang, Dawei Shen, Juan Jiang, Donglai Feng","doi":"10.1007/s11433-024-2636-9","DOIUrl":"10.1007/s11433-024-2636-9","url":null,"abstract":"<div><p>The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order (CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angle-resolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the <i>K</i> point and another around the <i>A</i> point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe, in contrast to the conventional nesting-driven mechanisms.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mott insulating phase and coherent-incoherent crossover across magnetic phase transition in 2D antiferromagnetic CrSBr 二维反铁磁性 CrSBr 中的莫特绝缘相和相干-非相干跨磁性相变

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-19 DOI: 10.1007/s11433-025-2625-7

Fan Wu, Xuefeng Zhang, Yi Chen, Ding Pei, Mengwen Zhan, Zicheng Tao, Cheng Chen, Shipeng Lu, Jingzhi Chen, Shujie Tang, Xia Wang, Yanfeng Guo, Lexian Yang, Yan Zhang, Yulin Chen, Qixi Mi, Gang Li, Zhongkai Liu

{"title":"Mott insulating phase and coherent-incoherent crossover across magnetic phase transition in 2D antiferromagnetic CrSBr","authors":"Fan Wu, Xuefeng Zhang, Yi Chen, Ding Pei, Mengwen Zhan, Zicheng Tao, Cheng Chen, Shipeng Lu, Jingzhi Chen, Shujie Tang, Xia Wang, Yanfeng Guo, Lexian Yang, Yan Zhang, Yulin Chen, Qixi Mi, Gang Li, Zhongkai Liu","doi":"10.1007/s11433-025-2625-7","DOIUrl":"10.1007/s11433-025-2625-7","url":null,"abstract":"<div><p>In two-dimensional van der Waals magnetic materials, the interplay between magnetism and electron correlation can give rise to new ground states and lead to novel transport and optical properties. A fundamental question in these materials is how the electron correlation manifests and interacts with the magnetic orders. In this study, we demonstrate that the recently discovered 2D antiferromagnetic material, CrSBr is a Mott insulator, through the combined use of resonant and temperature-dependent angle-resolved photoemission spectroscopy techniques, supplemented by dynamical mean-field theory analysis. Intriguingly, we found that as the system transitions from the antiferromagnetic to the paramagnetic phases, its Mott bands undergo a reconfiguration, and a coherent-incoherent crossover, driven by the dissolution of the magnetic order. Our findings reveal a distinctive evolution of band structure associated with magnetic phase transitions, shedding light on the investigation of the intricate interplay between correlation and magnetic orders in strongly correlated van der Waals magnetic materials.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0