Chinese Physics B最新文献_第2页

Broadband Third-Order Optical Nonlinearities of Layered Franckeite Towards Mid-Infrared Regime 层状方解石迈向中红外区的宽带三阶光学非线性特性

IF 1.5 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-08 DOI: 10.1088/1674-1056/ad6ccb

Zhi-Qiang Xu, Tian-Tian Zhou, Jie Li, Dong-Yang Liu, Yuan He, Ning Li, Xiao Liu, Li-Li Miao, Chujun Zhao, Shuang-Chun Wen

{"title":"Broadband Third-Order Optical Nonlinearities of Layered Franckeite Towards Mid-Infrared Regime","authors":"Zhi-Qiang Xu, Tian-Tian Zhou, Jie Li, Dong-Yang Liu, Yuan He, Ning Li, Xiao Liu, Li-Li Miao, Chujun Zhao, Shuang-Chun Wen","doi":"10.1088/1674-1056/ad6ccb","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6ccb","url":null,"abstract":"\u0000 The study of nonlinear optical responses in the mid-infrared (mid-IR) regime is essential for advancing ultrafast mid-IR laser applications. However, nonlinear optical effects under mid-IR excitation are rarely reported due to the lack of suitable nonlinear optical materials. The natural van der Waals heterostructure franckeite, known for its narrow bandgap and stability in air, shows great potential for developing mid-IR nonlinear optical devices. We have experimentally demonstrated that layered franckeite exhibits a broadband wavelength-dependent nonlinear optical response in the mid-IR spectral region. Franckeite nanosheets were prepared using a liquid-phase exfoliation method, and their nonlinear optical response was characterized in the 3000 nm to 5000 nm spectral range. The franckeite nanosheets exhibit broadband wavelength-dependent third-order nonlinearities, with nonlinear absorption and refraction coefficients estimated to be about 10-7 cm/W and 10-11 cm2/W, respectively. Additionally, a passively Q-switched fluoride fiber laser operating around a wavelength of 2800 nm was achieved, delivering nanosecond pulses with a signal-to-noise ratio of 43.6 dB, based on the nonlinear response of franckeite. These findings indicate that layered franckeite possesses broadband nonlinear optical characteristics in the mid-IR region, potentially enabling new possibilities for mid-IR photonic devices.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Visualizing extended defects at the atomic level in a Bi2Sr2CaCu2O8+δ superconducting wire 在 Bi2Sr2CaCu2O8+δ 超导线材中实现原子级扩展缺陷的可视化

IF 1.5 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-08 DOI: 10.1088/1674-1056/ad6ccd

Kejun Hu, Shuai Wang, Boyu Li, Ying Liu, Binghui Ge, Dongsheng Song

引用次数: 0

Molecular dynamics study on mechanical performance and deformation mechanisms in nanotwinned NiCo-based alloys with nano-precipitates under high temperatures 带纳米沉淀物的纳米镍钴基合金在高温下的力学性能和变形机制的分子动力学研究

IF 1.5 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-08 DOI: 10.1088/1674-1056/ad6cca

Zihao Yu, Hongyu Wang, Ligang Sun, Zhihui Li, Linli Zhu

{"title":"Molecular dynamics study on mechanical performance and deformation mechanisms in nanotwinned NiCo-based alloys with nano-precipitates under high temperatures","authors":"Zihao Yu, Hongyu Wang, Ligang Sun, Zhihui Li, Linli Zhu","doi":"10.1088/1674-1056/ad6cca","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6cca","url":null,"abstract":"\u0000 The molecular dynamics simulations are performed to investigate the mechanical behaviors of nanotwinned NiCo-based alloys containing coherent L12 nano-precipitates at different temperatures, as well as the interactions between the dislocations and nano-precipitates within the nanotwins. The simulation results demonstrate that both the yield stress and flow stress in the nanotwinned NiCo-based alloys with nano-precipitates decrease as the temperature rises, which come from the fact that the higher temperatures lead to generating the more defects during yielding and the lower dislocation density during plastic deformation. Moreover, the coherent L12 phase exhibits excellent thermal stability, which enables to hinder dislocation motion at elevated temperatures through the wrapping and cutting mechanisms of dislocations. The synergistic effect of nanotwins and nano-precipitates results in the more significant strengthening behaviors in the nanotwinned NiCo-based alloys under high temperature. In addition, the high-temperature mechanical behaviors of nanotwinned NiCo-based alloys with nano-precipitates are sensitive to the size and volume fraction of microstructures. These findings could be helpful for designing the nanotwins and nano-precipitates to improve the high-temperature mechanical properties in NiCo-based alloys.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Different topological phase transitions in the Su–Schrieffer–Heeger model under different disorder structures 不同无序结构下苏-施里弗-希格模型的不同拓扑相变

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad59fb

Yan Gu, Zhanpeng Lu

引用次数: 0

Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2 二维铁磁材料 CrTe2 的电流垂直于平面传输特性

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5af1

Jin Wang, Yu Liu, Taikun Wang, Yongkang Xu, Shuanghai Wang, Kun He, Yafeng Deng, Pengfei Yan, Liang He

{"title":"Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2","authors":"Jin Wang, Yu Liu, Taikun Wang, Yongkang Xu, Shuanghai Wang, Kun He, Yafeng Deng, Pengfei Yan, Liang He","doi":"10.1088/1674-1056/ad5af1","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5af1","url":null,"abstract":"Heterostructures of van der Waals (vdW) ferromagnetic materials have become a focal point in research of low-dimensional spintronic devices. The current direction in spin valves is commonly perpendicular to the plane (CPP). However, the transport properties of the CPP mode remain largely unexplored. In this work, current-in-plane (CIP) mode and CPP mode for CrTe2 thin films are carefully studied. The temperature-dependent longitudinal resistance transitions from metallic (CIP) to semiconductor behavior (CPP), with the electrical resistivity of CPP increased by five orders of magnitude. More importantly, the transport properties of the CPP can be categorized into a single-gap tunneling-through model with the activation energy (<italic toggle=\"yes\">E</italic>a) of ∼ 1.34 meV/gap at 300–150 K, the variable range hopping model with a linear negative magnetoresistance at 150–20 K, and weak localization region with a nonlinear magnetic resistance below 20 K. This study explores the vertical transport in CrTe2 materials for the first time, contributing to understand its unique properties and to pave the way for its potential in spin valve devices.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Induced magneto-conductivity in a two-nodeWeyl semimetal under Gaussian random disorder 高斯随机无序条件下双节点韦尔半金属的诱导磁导率

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad59fc

Chuanxiong Xu, Haoping Yu, Mei Zhou, Xuanting Ji

{"title":"Induced magneto-conductivity in a two-nodeWeyl semimetal under Gaussian random disorder","authors":"Chuanxiong Xu, Haoping Yu, Mei Zhou, Xuanting Ji","doi":"10.1088/1674-1056/ad59fc","DOIUrl":"https://doi.org/10.1088/1674-1056/ad59fc","url":null,"abstract":"Measuring the magneto-conductivity induced from impurities may help determine the impurity distribution and reveal the structure of a Weyl semimetal sample. To verify this, we utilize the Gaussian random disorder to simulate charged impurities in a two-node Weyl semimetal model and investigate the impact of charged impurities on magneto-conductivity in Weyl semimetals. We first compute the longitudinal magnetic conductivity and find that it is positive and increases proportionally with the parameter governing the Gaussian distribution of charged impurities, suggesting the presence of negative longitudinal magneto-resistivity. Then we consider both the intra-valley and inter-valley scattering processes to calculate the induced transverse magneto-conductivity in the model. Our findings indicate that both inter-valley and intra-valley scattering processes play important roles in the transverse magneto-conductivity. The locations of Weyl nodes can also be determined by magneto-conductivity measurements. This is possible if the magnetic field strength and the density of charged impurities are known. Alternatively, the measurement of magnetic conductivity may reveal the distribution of charged impurities in a given sample once the locations of the Weyl nodes have been determined. These findings can aid in detecting the structure of a Weyl semimetal sample, enhancing comprehension of magnetotransport in Weyl semimetals and promoting the development of valley electronics.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Pressure generation under deformation in a large-volume press 大容积压力机变形时产生的压力

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad58c6

Saisai Wang, Xinyu Zhao, Kuo Hu, Bingtao Feng, Xuyuan Hou, Yiming Zhang, Shucheng Liu, Yuchen Shang, Zhaodong Liu, Mingguang Yao, Bingbing Liu

{"title":"Pressure generation under deformation in a large-volume press","authors":"Saisai Wang, Xinyu Zhao, Kuo Hu, Bingtao Feng, Xuyuan Hou, Yiming Zhang, Shucheng Liu, Yuchen Shang, Zhaodong Liu, Mingguang Yao, Bingbing Liu","doi":"10.1088/1674-1056/ad58c6","DOIUrl":"https://doi.org/10.1088/1674-1056/ad58c6","url":null,"abstract":"Deformation can change the transition pathway of materials under high pressure, thus significantly affects physical and chemical properties of matters. However, accurate pressure calibration under deformation is challenging and thereby causes relatively large pressure uncertainties in deformation experiments, resulting in the synthesis of complex multiphase materials. Here, pressure generations of three types of deformation assemblies were well calibrated in a Walker-type large-volume press (LVP) by electrical resistance measurements combined with finite element simulations (FESs). Hard Al2O3 or diamond pistons in shear and uniaxial deformation assemblies significantly increase the efficiency of pressure generation compared with the conventional quasi-hydrostatic assembly. The uniaxial deformation assembly using flat diamond pistons possesses the highest efficiency in these deformation assemblies. This finding is further confirmed by stress distribution analysis based on FESs. With this deformation assembly, we found shear can effectively promote the transformation of C60 into diamond under high pressure and realized the synthesis of phase-pure diamond at relatively moderate pressure and temperature conditions. The present developed techniques will help improve pressure efficiencies in LVP and explore the new physical and chemical properties of materials under deformation in both science and technology.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Variational data encoding and correlations in quantum-enhanced machine learning 量子增强型机器学习中的变量数据编码和相关性

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5c3b

Ming-Hao Wang, Hua Lü

{"title":"Variational data encoding and correlations in quantum-enhanced machine learning","authors":"Ming-Hao Wang, Hua Lü","doi":"10.1088/1674-1056/ad5c3b","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5c3b","url":null,"abstract":"Leveraging the extraordinary phenomena of quantum superposition and quantum correlation, quantum computing offers unprecedented potential for addressing challenges beyond the reach of classical computers. This paper tackles two pivotal challenges in the realm of quantum computing: firstly, the development of an effective encoding protocol for translating classical data into quantum states, a critical step for any quantum computation. Different encoding strategies can significantly influence quantum computer performance. Secondly, we address the need to counteract the inevitable noise that can hinder quantum acceleration. Our primary contribution is the introduction of a novel variational data encoding method, grounded in quantum regression algorithm models. By adapting the learning concept from machine learning, we render data encoding a learnable process. This allowed us to study the role of quantum correlation in data encoding. Through numerical simulations of various regression tasks, we demonstrate the efficacy of our variational data encoding, particularly post-learning from instructional data. Moreover, we delve into the role of quantum correlation in enhancing task performance, especially in noisy environments. Our findings underscore the critical role of quantum correlation in not only bolstering performance but also in mitigating noise interference, thus advancing the frontier of quantum computing.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Influence of ion species on extraction characteristics of mixed ion beams 离子种类对混合离子束萃取特性的影响

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5c3d

Ao Xu, Pingping Gan, Xiang Wan, Yuanjie Shi

{"title":"Influence of ion species on extraction characteristics of mixed ion beams","authors":"Ao Xu, Pingping Gan, Xiang Wan, Yuanjie Shi","doi":"10.1088/1674-1056/ad5c3d","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5c3d","url":null,"abstract":"The spatial distributions of different kinds of ions are usually not completely the same in the process of extracting. In order to study the reason for the different characteristics of ion extraction, a simplified simulation model of Cu+ and Cr+ ions extraction process was established by 2D3V (two-dimensional in space and three-dimensional in velocity space) particle-in-cell (PIC) method. The effects of different extraction voltages from 0 V to 500 V on the density distribution of Cu+ and Cr+ ions and the change of plasma emission surface were analyzed. On the basis of this model, the ion density distribution characteristics of Cu+ ions mixed with Li+, Mg+, K+, Fe+, Y+, Ag+, Xe+, Au+, and Pb+ ions respectively under 200-V extraction voltage are further simulated, and it is revealed that the atomic mass of the ions is the key reason for different ion density distributions when different kinds of ions are mixed and extracted, which provides support for further understanding of ion extraction characteristics.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Evolutionary dynamics of tax-based strong altruistic reward and punishment in a public goods game 公共物品博弈中基于税收的强利他奖惩的进化动态

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5274

Zhi-Hao Yang, Yan-Long Yang

引用次数: 0