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All optical switches for optical soliton interactions in a birefringent fiber 用于双折射光纤中光孤子相互作用的全光开关
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/124204
Xin Zhang, Houhui Yi, Yanli Yao, Shubin Wang, Lingxian Shi
{"title":"All optical switches for optical soliton interactions in a birefringent fiber","authors":"Xin Zhang, Houhui Yi, Yanli Yao, Shubin Wang, Lingxian Shi","doi":"10.1088/0256-307x/40/12/124204","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/124204","url":null,"abstract":"\u0000 The interactions of optical solitons can be used to develop photonic information processing devices such as all optical switches and all optical logic gates. It is the key to achieving high-speed, high-capacity all optical networks and optical computers, and has important academic value. This paper is based on the coupled nonlinear Schrödinger equations to study the properties of all optical switches of optical solitons in birefringent fibers. Through the researches, it was found that different initial conditions can achieve all optical switching function, and the influence of different physical parameters of birefringent fibers on all optical soliton switching was studied. The relevant conclusions are conducive to achieving the all-optical switching function of optical solitons in birefringent fibers, providing useful guidance for the widespread application of optical soliton all-optical switches in birefringent fibers in fiber communications.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":" 13","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138615277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Bounding Free Energy Difference with Flow Matching 用流动匹配限定自由能差
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/120201
Lu Zhao, Lei Wang
{"title":"Bounding Free Energy Difference with Flow Matching","authors":"Lu Zhao, Lei Wang","doi":"10.1088/0256-307x/40/12/120201","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/120201","url":null,"abstract":"We introduce a method for computing the Helmholtz free energy using the flow matching technique. Unlike previous work that utilized flow-based models for variational free energy calculations, this method provides bounds for free energy estimation based on targeted free energy perturbation by performing calculations on samples from both ends of the mapping. We demonstrate applications of the present method by estimating the free energy of a classical Coulomb gas in a harmonic trap.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"11 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Realizations, Characterizations, and Manipulations of Two-Dimensional Electron Systems Floating above Superfluid Helium Surfaces 漂浮在超流体氦表面上的二维电子系统的实现、特征和操作
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/127301
Haoran Wei, Mengmeng Wu, Renfei Wang, Mingcheng He, Hiroki Ikegami, Yang Liu, Zhi Gang Cheng
{"title":"Realizations, Characterizations, and Manipulations of Two-Dimensional Electron Systems Floating above Superfluid Helium Surfaces","authors":"Haoran Wei, Mengmeng Wu, Renfei Wang, Mingcheng He, Hiroki Ikegami, Yang Liu, Zhi Gang Cheng","doi":"10.1088/0256-307x/40/12/127301","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127301","url":null,"abstract":"Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible controllability in microscales are the most prominent advantages that researchers strive for. Nevertheless, it is always difficult to fulfill all in one solid-state system. Two-dimensional electron systems (2DESs) floating above the superfluid helium surfaces are thought to meet these three requirements simultaneously, ensured by the atomic smoothness of surfaces and the electric neutrality of helium. Here we report our recent work in preparing, characterizing, and manipulating 2DESs on superfluid helium. We realized a tunability of electron density over one order of magnitude and tuned their transport properties by varying electron distribution and measurement frequency. The work we engage in is crucial for advancing research in many-body physics and for development of single-electron quantum devices rooted in these electron systems.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"205 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Highly Anisotropic Magnetism and Nearly Isotropic Magnetocaloric Effect in Mn3Sn2 Single Crystals Mn3Sn2 单晶中的高各向异性磁性和近乎各向同性的磁焦效应
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/127501
Jianli Bai, Qingxin Dong, Libo Zhang, Qiaoyu Liu, Jingwen Cheng, Pinyu Liu, Cundong Li, Yingrui Sun, Yu Huang, Zhian Ren, Genfu Chen
{"title":"Highly Anisotropic Magnetism and Nearly Isotropic Magnetocaloric Effect in Mn3Sn2 Single Crystals","authors":"Jianli Bai, Qingxin Dong, Libo Zhang, Qiaoyu Liu, Jingwen Cheng, Pinyu Liu, Cundong Li, Yingrui Sun, Yu Huang, Zhian Ren, Genfu Chen","doi":"10.1088/0256-307x/40/12/127501","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127501","url":null,"abstract":"Mn<sub>3</sub>Sn<sub>2</sub> has been proposed as an ideal material for magnetic refrigeration. It undergoes two successive ferromagnetic transitions (<italic toggle=\"yes\">T</italic>\u0000<sub>C1</sub> = 262 K and <italic toggle=\"yes\">T</italic>\u0000<sub>C2</sub> = 227 K) and one antiferromagnetic transition (<italic toggle=\"yes\">T</italic>\u0000<sub>N</sub> = 192 K). Herein we report, for the first time, the preparation of single crystals of Mn<sub>3</sub>Sn<sub>2</sub> from Bi flux. The resultant anisotropic magnetic properties and magnetocaloric effect are investigated along the three principal crystallographic directions of the crystal. Significant anisotropy of magnetic susceptibility and multiple field-induced metamagnetic transitions were found at low fields, whereas the magnetocaloric effect was found to be almost isotropic and larger than that of the polycrystalline one. The maximum magnetic entropy change amounts to −Δ<italic toggle=\"yes\">S</italic>\u0000<sub>M</sub> = 4.01 J⋅kg<sup>−1</sup>⋅K<sup>−1</sup> near <italic toggle=\"yes\">T</italic>\u0000<sub>C1</sub> under a magnetic field change of <italic toggle=\"yes\">μ</italic>\u0000<sub>0</sub>Δ<italic toggle=\"yes\">H</italic> = 5 T along the <italic toggle=\"yes\">c</italic>-axis, with the corresponding refrigerant capacity of 1750 mJ⋅cm<sup>−3</sup>. Combined with a much wider cooling temperature span (∼ 80 K), our results demonstrate Mn<sub>3</sub>Sn<sub>2</sub> single crystal to be an attractive candidate working material for active magnetic refrigeration at low temperatures.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"78 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139057874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Magnetic topological Dirac semimetal transition driven by SOC in EuMg2Bi2 EuMg2Bi2 中由 SOC 驱动的磁拓扑狄拉克半金属转变
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-29 DOI: 10.1088/0256-307x/41/1/017101
J. M. Wang, H. J. Qian, Q. Jiang, S. Qiao, M. Ye
{"title":"Magnetic topological Dirac semimetal transition driven by SOC in EuMg2Bi2","authors":"J. M. Wang, H. J. Qian, Q. Jiang, S. Qiao, M. Ye","doi":"10.1088/0256-307x/41/1/017101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/017101","url":null,"abstract":"Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport phenomena. Investigating the interplay between magnetic and topological orders in systems with broken time-reversal symmetry is crucial for realizing non-trivial quantum effects. In this work, we delved into the electronic structure of the rare-earth based antiferromagnetic Dirac semimetal EuMg2Bi2 using first-principles calculations and angleresolved photoemission spectroscopy. Our calculations revealed that the spin-orbit coupling (SOC) in EuMg2Bi2 prompts an insulator to topological semimetal transition, with the Dirac bands protected by crystal symmetries. Linear dispersive states near the Fermi level, primarily originating from Bi 6p orbitals, were observed on both the (001) and (100) surfaces, confirming that EuMg2Bi2 is a three-dimensional (3D) topological Dirac semimetal. This research offers pivotal insights into the interplay between magnetism, SOC and topological phase transitions in spintronics applications.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"2 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Optical-microwave entanglement paves the way for distributed quantum computation 光微波纠缠为分布式量子计算铺平道路
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-28 DOI: 10.1088/0256-307x/41/1/014203
Zhifeng Hu, Kai Xu, Yu-Xiang Zhang, Bei-Bei Li
{"title":"Optical-microwave entanglement paves the way for distributed quantum computation","authors":"Zhifeng Hu, Kai Xu, Yu-Xiang Zhang, Bei-Bei Li","doi":"10.1088/0256-307x/41/1/014203","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/014203","url":null,"abstract":"<jats:p />","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"58 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139224514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Unleashing the Power of Moiré Materials in Neuromorphic Computing 在神经形态计算中释放摩尔纹材料的力量
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-27 DOI: 10.1088/0256-307X/40/12/127202
John Paul Strachan
{"title":"Unleashing the Power of Moiré Materials in Neuromorphic Computing","authors":"John Paul Strachan","doi":"10.1088/0256-307X/40/12/127202","DOIUrl":"https://doi.org/10.1088/0256-307X/40/12/127202","url":null,"abstract":"<jats:p />","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"45 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139233860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 composite ansatz for the calculation of dynamical structure factor 用于计算动态结构因子的复合公式
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-25 DOI: 10.1088/0256-307x/41/1/017801
Yupei Zhang, C. Mo, Ping Zhang, Wei Kang
{"title":"A composite ansatz for the calculation of dynamical structure factor","authors":"Yupei Zhang, C. Mo, Ping Zhang, Wei Kang","doi":"10.1088/0256-307x/41/1/017801","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/017801","url":null,"abstract":"We propose an ansatz without adjustable parameters for the calculation of dynamical structure factor. The ansatz combines quasi-particle Green’s function, especially the contribution from the renormalization factor, and the exchange-correlation kernel from time-dependent density functional theory together, verified for typical metals and semiconductors from plasmon excitation regime to Compton scattering regime. It has the capability to reconcile both small-angle and large-angle inelastic x-ray scattering (IXS) signals with much improved accuracy, which can be used, as the theoretical base model, in inversely inferring electronic structures of condensed matter from IXS experimental signals directly. It may also be used to diagnose thermal parameters, such as temperature and density, of dense plasmas in x-ray Thomson scattering experiments.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"23 16","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139237992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Determination of thermal properties of unsmooth Si-nanowires 测定非光滑硅纳米线的热特性
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-24 DOI: 10.1088/0256-307x/41/1/016301
Shi-Xian Liu, A. Barinov, Fei Yin, V. Khvesyuk
{"title":"Determination of thermal properties of unsmooth Si-nanowires","authors":"Shi-Xian Liu, A. Barinov, Fei Yin, V. Khvesyuk","doi":"10.1088/0256-307x/41/1/016301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/016301","url":null,"abstract":"In this work, we estimate the thermal properties of unsmooth Si-nanowires, considering key factors such as size (diameter), surface texture (roughness), and quantum size effects (phonon states) at different temperatures. For nanowires with a diameter smaller than 20 nm, we highlight the importance of quantum size effects in heat capacity calculations, using dispersion relations derived from the modified frequency equation for the elasticity of rod. The thermal conductivities of nanowires with diameters of 37, 56, and 115 nm are predicted using the FuchsSondheimer model and Soffer’s specular parameter. Notably, the roughness parameters are chosen to reflect the technological characteristics of the real surfaces. Our findings reveal that surface texture plays a significant role in thermal conductivity, particularly in the realm of ballistic heat transfer within nanowires. This study provides practical recommendations for developing new thermal management materials.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"34 3","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Twin capture Rydberg state excitation enhanced with few-cycle laser pulses 用少周期激光脉冲增强双捕获雷德贝格态激发
IF 3.5 2区 物理与天体物理
Chinese Physics Letters Pub Date : 2023-11-21 DOI: 10.1088/0256-307x/41/1/013201
Jing Zhao, Jinlei Liu, Xiaowei Wang, Zengxiu Zhao
{"title":"Twin capture Rydberg state excitation enhanced with few-cycle laser pulses","authors":"Jing Zhao, Jinlei Liu, Xiaowei Wang, Zengxiu Zhao","doi":"10.1088/0256-307x/41/1/013201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/013201","url":null,"abstract":"Quantum excitation used to be regarded as a transient process that takes no time and the behind physics remains mystery. Recent research shows that Rydberg-state excitation with ultrashort laser pulses can be investigated and manipulated with the state-of-the-art few-cycle pulses. In this work, we found theoretically that the Rydberg state excitation probability is more efficient with short laser pulse, and modulated by varying the laser intensities. We uncover a new facet of the excitation dynamics: the launching of electron wave packet through strong-field ionization, the reentry of the electron into the atomic potential, and the crucial step that the electron makes a U-turn leading to twin captures into Rydberg orbitals. By tuning the laser intensity, we show the excitation of Rydberg state can be coherently controlled in sub-optical-cycle time scale. Our work paves the way toward ultrafast control and coherent manipulation of Rydberg states, thus benefits Rydberg-state-based quantum technology.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"17 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139251627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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