Pub Date : 2024-07-12DOI: 10.1088/1674-1056/ad6256
Xuan Wang, Santo Banerjee, Yinghong Cao, Jun Mou
Memristors are extensively used to estimate the external electromagnetic stimulation and synapses for neurons. In this paper, two distinct scenarios, ideal memristor serves as external electromagnetic stimulation and locally active memristor serves as synapse, are formulated to investigate the impact of memristor on a 2D Hindmarsh-Rose neuron model. Numerical simulations show that the neuronal models in different scenarios have multiple burst firing patterns. The introduction of the memristor makes the neuronal model exhibit complex dynamical behaviors. Finally, the simulation circuit and DSP hardware implementation results validate the physical mechanism as well as the reliability of the biological neuron model.
{"title":"Memristors-coupled neuron models with multiple firing patterns and homogeneous and heterogeneous multistability","authors":"Xuan Wang, Santo Banerjee, Yinghong Cao, Jun Mou","doi":"10.1088/1674-1056/ad6256","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6256","url":null,"abstract":"\u0000 Memristors are extensively used to estimate the external electromagnetic stimulation and synapses for neurons. In this paper, two distinct scenarios, ideal memristor serves as external electromagnetic stimulation and locally active memristor serves as synapse, are formulated to investigate the impact of memristor on a 2D Hindmarsh-Rose neuron model. Numerical simulations show that the neuronal models in different scenarios have multiple burst firing patterns. The introduction of the memristor makes the neuronal model exhibit complex dynamical behaviors. Finally, the simulation circuit and DSP hardware implementation results validate the physical mechanism as well as the reliability of the biological neuron model.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"36 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141655122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1088/1674-1056/ad6258
Luyao Zhang, Xiyang Xie
In this work, we study the dynamics of fundamental and double-pole breathers and solitons for the focusing and defocusing nonlinear Schrödinger equation with the sextic operator under non-zero boundary conditions. Our analysis mainly focuses on the dynamical properties of simple- and double-pole solutions. Firstly, through verification, we find that solutions with non-zero boundary conditions can be transformed into solutions with zero boundary conditions, whether in simple-pole or double-pole cases. For the focusing case, in the investigation of simple-pole solutions, temporal periodic breather and the spatial-temporal periodic breather are obtained by modulating parameters. Additionally, in the case of multi-pole solitons, we analyze parallel-state solitons, bound-state solitons, and intersecting solitons, providing a brief analysis of their interactions. Under the double-pole case, we observe that the two solitons undergo two interactions, resulting in a distinctive “triangle” crest. Furthermore, for the defocusing case, we briefly consider two situations of simple-pole solutions, obtaining one and two dark solitons.
{"title":"Dynamics of fundamental and double-pole breathers and solitons for a nonlinear Schrödinger equation with the sextic operator under non-zero boundary conditions","authors":"Luyao Zhang, Xiyang Xie","doi":"10.1088/1674-1056/ad6258","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6258","url":null,"abstract":"\u0000 In this work, we study the dynamics of fundamental and double-pole breathers and solitons for the focusing and defocusing nonlinear Schrödinger equation with the sextic operator under non-zero boundary conditions. Our analysis mainly focuses on the dynamical properties of simple- and double-pole solutions. Firstly, through verification, we find that solutions with non-zero boundary conditions can be transformed into solutions with zero boundary conditions, whether in simple-pole or double-pole cases. For the focusing case, in the investigation of simple-pole solutions, temporal periodic breather and the spatial-temporal periodic breather are obtained by modulating parameters. Additionally, in the case of multi-pole solitons, we analyze parallel-state solitons, bound-state solitons, and intersecting solitons, providing a brief analysis of their interactions. Under the double-pole case, we observe that the two solitons undergo two interactions, resulting in a distinctive “triangle” crest. Furthermore, for the defocusing case, we briefly consider two situations of simple-pole solutions, obtaining one and two dark solitons.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"61 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1088/1674-1056/ad625a
Fan Zhang, Jia-Qin Dong, Zhijiang Xie, Zhi-Yu He, Hua Shu, Ruirong Wang, Jun Xiong, G. Jia, Zhi-Heng Fang, Wei Wang, Da-Du Xiao, Anthony Lei, Jie Chen, Xiu-Guang Huang
In this work, the phase transition of polycrystalline iron compressed along the Hugoniot was studied by combining laser-driven shock with in-situ X-ray diffraction technique. It is suggested that polycrystalline iron changes from an initial body-centered cubic structure to a hexagonal close-packed structure with increasing pressure (i.e., a phase transition from α to ε). The relationship between density and pressure for polycrystalline iron obtained from the present experiments was found to be in good agreement with gas-gun Hugoniot data. Our results show that experiments at lower temperatures under static loading, such as in a diamond anvil cell, lead to higher densities than those found under dynamic loading. This means that extrapolating results of static experiments may not predict the dynamic responses of materials accurately. In addition, neither the face-centered cubic structure seen in previous molecular-dynamics simulations nor two-phase coexistence were found within our experimental pressure range.
在这项工作中，通过激光驱动冲击和原位 X 射线衍射技术相结合，研究了沿休戈诺压缩的多晶铁的相变。研究表明，随着压力的增加，多晶铁会从最初的体心立方结构转变为六方紧密堆积结构（即从α到ε的相变）。本实验所获得的多晶铁密度与压力之间的关系与气枪休格诺数据非常吻合。我们的结果表明，在较低温度下进行的静态加载实验（如在金刚石砧槽中）比动态加载实验得出的密度要高。这意味着推断静态实验结果可能无法准确预测材料的动态响应。此外，在我们的实验压力范围内，既没有发现之前分子动力学模拟中的面心立方结构，也没有发现两相共存的现象。
{"title":"Direct observation of shock-induced phase transformation in polycrystalline iron via in-situ X-ray diffraction","authors":"Fan Zhang, Jia-Qin Dong, Zhijiang Xie, Zhi-Yu He, Hua Shu, Ruirong Wang, Jun Xiong, G. Jia, Zhi-Heng Fang, Wei Wang, Da-Du Xiao, Anthony Lei, Jie Chen, Xiu-Guang Huang","doi":"10.1088/1674-1056/ad625a","DOIUrl":"https://doi.org/10.1088/1674-1056/ad625a","url":null,"abstract":"\u0000 In this work, the phase transition of polycrystalline iron compressed along the Hugoniot was studied by combining laser-driven shock with in-situ X-ray diffraction technique. It is suggested that polycrystalline iron changes from an initial body-centered cubic structure to a hexagonal close-packed structure with increasing pressure (i.e., a phase transition from α to ε). The relationship between density and pressure for polycrystalline iron obtained from the present experiments was found to be in good agreement with gas-gun Hugoniot data. Our results show that experiments at lower temperatures under static loading, such as in a diamond anvil cell, lead to higher densities than those found under dynamic loading. This means that extrapolating results of static experiments may not predict the dynamic responses of materials accurately. In addition, neither the face-centered cubic structure seen in previous molecular-dynamics simulations nor two-phase coexistence were found within our experimental pressure range.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"25 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141655186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-10DOI: 10.1088/1674-1056/ad6130
Zhang Yi, Qiyuan Jiang, Bingfeng Sun, Wei Jiahu, Yang Lin, Yongyuan Li, Zhiguo Wang, Kaiyong Yang, Luo Hui
The dynamic range of the nuclear magnetic resonance gyroscope can be effectively improved through the closed-loop control scheme, which is crucial to its application in inertial measurement. This paper presents the analytical transfer function of Xe closed-loop system in the nuclear magnetic resonance gyroscope considering Rb-Xe coupling effect. It not only considers the dynamic characteristics of the system more comprehensively, but also adds the influence of the practical filters in the gyro signal processing system, which can obtain the accurate response characteristics of signal frequency and amplitude at the same time. The numerical results are compared with a experimentally verified simulation program, which indicate great agreement. The research results of this paper are of great significance to the practical application and development of the nuclear magnetic resonance gyroscope.
{"title":"Response analysis of NMRG system considering Rb-Xe coupling","authors":"Zhang Yi, Qiyuan Jiang, Bingfeng Sun, Wei Jiahu, Yang Lin, Yongyuan Li, Zhiguo Wang, Kaiyong Yang, Luo Hui","doi":"10.1088/1674-1056/ad6130","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6130","url":null,"abstract":"\u0000 The dynamic range of the nuclear magnetic resonance gyroscope can be effectively improved through the closed-loop control scheme, which is crucial to its application in inertial measurement. This paper presents the analytical transfer function of Xe closed-loop system in the nuclear magnetic resonance gyroscope considering Rb-Xe coupling effect. It not only considers the dynamic characteristics of the system more comprehensively, but also adds the influence of the practical filters in the gyro signal processing system, which can obtain the accurate response characteristics of signal frequency and amplitude at the same time. The numerical results are compared with a experimentally verified simulation program, which indicate great agreement. The research results of this paper are of great significance to the practical application and development of the nuclear magnetic resonance gyroscope.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"14 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-10DOI: 10.1088/1674-1056/ad6131
Fangmin Wang, Wenlin Li, Hongfei Dai, Chunyi Li, Jianhua Zhou, Shenhui Xue, Bo Wang
The composite time scale (CTS) provides a stable, accurate and reliable time scale for modern society. The improvement of CTS’s real-time performance will improve its stability, which strengths related applications’ performance. Aiming at this goal, a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this paper. The determinants of the CTS’s calculation interval (characteristics of the clock ensemble, the measurement noise, the time and frequency synchronization system’s noise and the auxiliary output generator noise floor) are studied and the optimal calculation interval is obtained. We also investigate the effect of ensemble algorithm’s initial parameters on the CTS’s adjustment stage. A strategy to get the reasonable initial parameters of ensemble algorithm is designed. The results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial parameters. On this basis, we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than ~ 1700 s. The experimental result proves that the CTS’s real-time performance is significantly improved.
复合时间尺度（CTS）为现代社会提供了一个稳定、准确和可靠的时间尺度。改善 CTS 的实时性能将提高其稳定性，从而增强相关应用的性能。针对这一目标，本文提出了一种通过确定最佳计算间隔和加速调整阶段来实现的方法。本文研究了 CTS 计算间隔的决定因素（时钟组的特性、测量噪声、时间和频率同步系统的噪声以及辅助输出发生器的本底噪声），并得出了最佳计算间隔。我们还研究了集合算法初始参数对 CTS 调整阶段的影响。设计了一种策略来获取合理的集合算法初始参数。结果表明，在初始参数合理的情况下，调整阶段可以快速结束，甚至可以缩短为零。在此基础上，我们通过实验生成了计算间隔为 500 s 的分布式 CTS，当平均时间大于 ~ 1700 s 时，其稳定性优于成员时钟。
{"title":"A Real-time Performance Improvement Method for Composite Time Scale","authors":"Fangmin Wang, Wenlin Li, Hongfei Dai, Chunyi Li, Jianhua Zhou, Shenhui Xue, Bo Wang","doi":"10.1088/1674-1056/ad6131","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6131","url":null,"abstract":"\u0000 The composite time scale (CTS) provides a stable, accurate and reliable time scale for modern society. The improvement of CTS’s real-time performance will improve its stability, which strengths related applications’ performance. Aiming at this goal, a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this paper. The determinants of the CTS’s calculation interval (characteristics of the clock ensemble, the measurement noise, the time and frequency synchronization system’s noise and the auxiliary output generator noise floor) are studied and the optimal calculation interval is obtained. We also investigate the effect of ensemble algorithm’s initial parameters on the CTS’s adjustment stage. A strategy to get the reasonable initial parameters of ensemble algorithm is designed. The results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial parameters. On this basis, we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than ~ 1700 s. The experimental result proves that the CTS’s real-time performance is significantly improved.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"38 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-09DOI: 10.1088/1674-1056/ad6077
Yunxi Qi, Jun Zhao, Hui Zeng
Exploring novel two-dimensional (2D) valleytronic materials has an essential impact on the design of spintronic and valleytronic devices. Our first principles calculation results reveal that the Janus SWSiX2 (X = N, P, As) monolayer has excellent dynamical and thermal stability. Owing to strong spin-orbit coupling (SOC), the SWSiX2 monolayer exhibits a valence band spin splitting of up to 0.49 eV, making it promising 2D semiconductor for valleytronic applications. The opposite Berry curvatures and optical selection rules lead to the coexistence of valley and spin Hall effects in the SWSiX2 monolayer. Moreover, the optical transition energies can be remarkably modulated by the in-plane strains. Large tensile (compressive) inplane strains can achieve spin flipping in the SWSiN2 monolayer, and induce both SWSiP2 and SWSiAs2 monolayers transit from semiconductor to metal. Our research provides new 2D semiconductor candidates for designing high-performance valleytronic devices.
{"title":"Strain-tuned electronic and valley-related properties in Janus monolayers of SWSiX2(X = N, P, As)","authors":"Yunxi Qi, Jun Zhao, Hui Zeng","doi":"10.1088/1674-1056/ad6077","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6077","url":null,"abstract":"\u0000 Exploring novel two-dimensional (2D) valleytronic materials has an essential impact on the design of spintronic and valleytronic devices. Our first principles calculation results reveal that the Janus SWSiX2 (X = N, P, As) monolayer has excellent dynamical and thermal stability. Owing to strong spin-orbit coupling (SOC), the SWSiX2 monolayer exhibits a valence band spin splitting of up to 0.49 eV, making it promising 2D semiconductor for valleytronic applications. The opposite Berry curvatures and optical selection rules lead to the coexistence of valley and spin Hall effects in the SWSiX2 monolayer. Moreover, the optical transition energies can be remarkably modulated by the in-plane strains. Large tensile (compressive) inplane strains can achieve spin flipping in the SWSiN2 monolayer, and induce both SWSiP2 and SWSiAs2 monolayers transit from semiconductor to metal. Our research provides new 2D semiconductor candidates for designing high-performance valleytronic devices.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"42 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141663590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-09DOI: 10.1088/1674-1056/ad6079
Sha Lu, Dequan Meng, Adnan Khan, Wang Ziao, Shiwei Chen, Shiheng Liang
Non-collinear antiferromagnet Mn3Sn has shown remarkable efficiency in charge-spin conversion, a novel magnetic spin Hall effect, and a stable topological antiferromagnetic state, which has resulted in great interest from researchers in the field of spin orbit torque. Current research has primarily focused on the spin orbit torque effect of epitaxially grown non-collinear antiferromagnet Mn3Sn films. However, this method is not suitable for large-scale industrial preparation. In this study, amorphous Mn3Sn films and Mn3Sn/Py heterostructures were prepared using a magnetron sputtering on silicon substrates. The spin torque-ferromagnetic resonance measurement demonstrated that only the conventional spin orbit torque effect generated by inplane polarized spin currents exists in the Mn3Sn/Py heterostructure, with a spin-orbit torque efficiency of 0.016. Additionally, we prepared the perpendicular magnetized Mn3Sn/CoTb heterostructure based on amorphous Mn3Sn film, where the spin-orbit torque driven perpendicular magnetization switching was achieved with a lower critical switching current density (3.9×107 A/cm2) compared to Ta/CoTb heterostructure. This research reveals the spin-orbit torque effect of amorphous Mn3Sn films and establishes a foundation for further advancement in the practical application of Mn3Sn materials in spintronic devices.
{"title":"Spin-orbit torque effect in silicon-based sputtered Mn3Sn film","authors":"Sha Lu, Dequan Meng, Adnan Khan, Wang Ziao, Shiwei Chen, Shiheng Liang","doi":"10.1088/1674-1056/ad6079","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6079","url":null,"abstract":"\u0000 Non-collinear antiferromagnet Mn3Sn has shown remarkable efficiency in charge-spin conversion, a novel magnetic spin Hall effect, and a stable topological antiferromagnetic state, which has resulted in great interest from researchers in the field of spin orbit torque. Current research has primarily focused on the spin orbit torque effect of epitaxially grown non-collinear antiferromagnet Mn3Sn films. However, this method is not suitable for large-scale industrial preparation. In this study, amorphous Mn3Sn films and Mn3Sn/Py heterostructures were prepared using a magnetron sputtering on silicon substrates. The spin torque-ferromagnetic resonance measurement demonstrated that only the conventional spin orbit torque effect generated by inplane polarized spin currents exists in the Mn3Sn/Py heterostructure, with a spin-orbit torque efficiency of 0.016. Additionally, we prepared the perpendicular magnetized Mn3Sn/CoTb heterostructure based on amorphous Mn3Sn film, where the spin-orbit torque driven perpendicular magnetization switching was achieved with a lower critical switching current density (3.9×107 A/cm2) compared to Ta/CoTb heterostructure. This research reveals the spin-orbit torque effect of amorphous Mn3Sn films and establishes a foundation for further advancement in the practical application of Mn3Sn materials in spintronic devices.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"121 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-09DOI: 10.1088/1674-1056/ad6078
Cui-E Hu, Mu-Xin Jiao, Xue-Nan Yang, Zhao-Yi Zeng, Jun Chen
The thermal conductivity of ε-iron at high pressure and high temperature is a key parameter to constrain the dynamics and thermal evolution of the Earth’s core. In this work, we use first-principles calculations to study the Hugoniot sound velocity and the thermal transport properties of ε-iron. The total thermal conductivities considering lattice vibration is 200 W/mK at the Earth’s inner core conditions. The suppressed anharmonic interactions can significantly enhance the lattice thermal conductivity under high pressure, and the contribution of the lattice thermal conductivity should not be ignored under Earth's core conditions.
{"title":"The thermal conductivity of iron under the Earth's inner core pressure","authors":"Cui-E Hu, Mu-Xin Jiao, Xue-Nan Yang, Zhao-Yi Zeng, Jun Chen","doi":"10.1088/1674-1056/ad6078","DOIUrl":"https://doi.org/10.1088/1674-1056/ad6078","url":null,"abstract":"\u0000 The thermal conductivity of ε-iron at high pressure and high temperature is a key parameter to constrain the dynamics and thermal evolution of the Earth’s core. In this work, we use first-principles calculations to study the Hugoniot sound velocity and the thermal transport properties of ε-iron. The total thermal conductivities considering lattice vibration is 200 W/mK at the Earth’s inner core conditions. The suppressed anharmonic interactions can significantly enhance the lattice thermal conductivity under high pressure, and the contribution of the lattice thermal conductivity should not be ignored under Earth's core conditions.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"77 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-09DOI: 10.1088/1674-1056/ad607a
Zhi Tan, Bo Lu, Chengyin Han, Chaohong Lee
Magneto-optical traps (MOTs) composed of magnetic fields and light fields have been widely utilized to cool and confine microscopic particles. Practical technology applications require miniaturized MOTs. The advancement of planar optics has promoted the development of compact MOTs. In this article, we review the development of compact MOTs based upon planar optics. At first, we introduce the standard MOTs. We then introduce the grating MOTs with micron structures, which have been used to build cold atomic clocks, cold atomic interferometers, and ultra-cold sources. In further, we introduce the integrated MOTs based on nanoscale metasurfaces. These new compact MOTs greatly reduce volume and power consumption, and provide new opportunities for fundamental research and practical applications.
由磁场和光场组成的磁光陷阱（MOT）已被广泛用于冷却和限制微观粒子。实际技术应用需要小型化的 MOT。平面光学的发展促进了小型 MOT 的开发。本文回顾了基于平面光学的紧凑型 MOT 的发展。首先，我们介绍标准 MOT。然后，我们介绍具有微米结构的光栅 MOT，它们已被用于制造冷原子钟、冷原子干涉仪和超冷源。此外，我们还介绍了基于纳米级元表面的集成 MOT。这些新型的紧凑型 MOT 大大减少了体积和功耗，为基础研究和实际应用提供了新的机遇。
{"title":"Compact Magneto-Optical Traps Using Planar Optics","authors":"Zhi Tan, Bo Lu, Chengyin Han, Chaohong Lee","doi":"10.1088/1674-1056/ad607a","DOIUrl":"https://doi.org/10.1088/1674-1056/ad607a","url":null,"abstract":"\u0000 Magneto-optical traps (MOTs) composed of magnetic fields and light fields have been widely utilized to cool and confine microscopic particles. Practical technology applications require miniaturized MOTs. The advancement of planar optics has promoted the development of compact MOTs. In this article, we review the development of compact MOTs based upon planar optics. At first, we introduce the standard MOTs. We then introduce the grating MOTs with micron structures, which have been used to build cold atomic clocks, cold atomic interferometers, and ultra-cold sources. In further, we introduce the integrated MOTs based on nanoscale metasurfaces. These new compact MOTs greatly reduce volume and power consumption, and provide new opportunities for fundamental research and practical applications.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"116 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1088/1674-1056/ad5d9a
Aming Lin, Jing Shi, Su-Huai Wei, Yi-Yang Sun
Considerable efforts are being made to transition current lithium-ion and sodium-ion batteries towards the use of solid-state electrolytes. Computational methods, specifically nudged elastic band (NEB) and molecular dynamics (MD) methods, provide powerful tools for the design of solid-state electrolytes. The MD method is usually the choice for studying the materials involving complex multiple diffusion paths or having disordered structures. However, it relies on simulations at temperatures much higher than working temperature. This paper studies the reliability of the MD method using the system of Na diffusion in MgO as a benchmark. We carefully study the convergence behavior of the MD method and demonstrate that total effective simulation time of 12 ns can converge the calculated diffusion barrier to about 0.01 eV. The calculated diffusion barrier is 0.31 eV from both methods. The diffusion coefficients at room temperature are 4.3×10-9 and 2.2×10-9 cm2/s, respectively, from the NEB and MD methods. Our results justify the reliability of the MD method, even though high temperature simulations have to be employed to overcome the limitation on simulation time.
{"title":"Comparative study of nudged elastic band and molecular dynamics methods for diffusion kinetics in solid-state electrolytes","authors":"Aming Lin, Jing Shi, Su-Huai Wei, Yi-Yang Sun","doi":"10.1088/1674-1056/ad5d9a","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5d9a","url":null,"abstract":"\u0000 Considerable efforts are being made to transition current lithium-ion and sodium-ion batteries towards the use of solid-state electrolytes. Computational methods, specifically nudged elastic band (NEB) and molecular dynamics (MD) methods, provide powerful tools for the design of solid-state electrolytes. The MD method is usually the choice for studying the materials involving complex multiple diffusion paths or having disordered structures. However, it relies on simulations at temperatures much higher than working temperature. This paper studies the reliability of the MD method using the system of Na diffusion in MgO as a benchmark. We carefully study the convergence behavior of the MD method and demonstrate that total effective simulation time of 12 ns can converge the calculated diffusion barrier to about 0.01 eV. The calculated diffusion barrier is 0.31 eV from both methods. The diffusion coefficients at room temperature are 4.3×10-9 and 2.2×10-9 cm2/s, respectively, from the NEB and MD methods. Our results justify the reliability of the MD method, even though high temperature simulations have to be employed to overcome the limitation on simulation time.","PeriodicalId":504421,"journal":{"name":"Chinese Physics B","volume":"48 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：