Chinese Physics Letters最新文献_第7页

The ground state and its topological properties of 3D spin-orbit Coupled Degenerate Fermi Gases 三维自旋轨道耦合退化费米气体的基态及其拓扑特性

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-14 DOI: 10.1088/0256-307x/40/12/127402

Long Xiong, Ming Gong, ZhaoXiang Fang, Rui Sun

引用次数: 0

Three-wave mixing of dipole solitons in one-dimensional quasi-phase-matched nonlinear crystals 一维准相位匹配非线性晶体中偶极孤子的三波混合

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-14 DOI: 10.1088/0256-307x/41/1/014204

Yuxin Guo, Xiaoxi Xu, Zhaopin Chen, Yangui Zhou, Bin Liu, Hexiang He, Yongyao Li, Jianing Xie

{"title":"Three-wave mixing of dipole solitons in one-dimensional quasi-phase-matched nonlinear crystals","authors":"Yuxin Guo, Xiaoxi Xu, Zhaopin Chen, Yangui Zhou, Bin Liu, Hexiang He, Yongyao Li, Jianing Xie","doi":"10.1088/0256-307x/41/1/014204","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/014204","url":null,"abstract":"\u0000 In this paper, a quasi-phase-matched (QPM) technique is introduced for soliton transmission in a quadratic (x\u0000 (2)) nonlinear crystal to realize stable transmission of dipole solitons in one-dimensional (1D) space under three-wave mixing. We report four types of solitons as dipole solitons with distances between their bimodal peaks that can be laid out in different stripes. We study three cases of these solitons: spaced three stripes apart, one stripe apart, and confined to the same stripe. For the case of three stripes apart, all four types have stable results, but for the case of one stripe apart, stable solutions can only be found at w\u0000 1 = w\u0000 2, and for the condition of dipole solitons confined to one stripe, stable solutions exist only for Type1 and Type3 at w\u0000 1 = w\u0000 2. The stability of the soliton solution is solved and verified using the imaginary time propagation (ITP) method and real-time transfer propagation (RTP), and soliton solutions are shown to exist in the multistability case. In addition, the relations of the transportation characteristics of the dipole soliton and the modulation parameters are numerically investigated. Finally, possible approaches for experimental realization of the solitons are outlined.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"207 3","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002314","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

Experimentally ruling out joint reality based on locality with device-independent steering 通过实验排除基于位置性的联合现实，转向与设备无关

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-14 DOI: 10.1088/0256-307x/41/1/010301

Shuaining Zhang, Xiang Zhang, Zhiyue Zheng, Wei Zhang

{"title":"Experimentally ruling out joint reality based on locality with device-independent steering","authors":"Shuaining Zhang, Xiang Zhang, Zhiyue Zheng, Wei Zhang","doi":"10.1088/0256-307x/41/1/010301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/010301","url":null,"abstract":"\u0000 As an essential concept to understand the world, whether the real values (or physical realities) of observables are suitable to the physical systems beyond classic has been debated for many decades. Although standard nogo results based on Bell inequalities have ruled out the joint reality of incompatible quantum observables, the possibility of giving simple yet strong arguments to rule out joint reality in any physical system (not necessarily quantum) with weaker assumptions and less observables, has been explored and proposed recently. Here, we perform a device-independent experiment on two-qubit superconducting system to show the joint reality of two observables is incompatible with locality under weaker assumption of the reality of observables in a single space-time region (or single qubit). Our results clearly show the violation of certain inequalities derived from both linear and nonlinear criteria. In addition, we study the robustness of the linear and nonlinear criterion against the effect of systematic decoherence. Our demonstration opens up the possibility of delineating classical and non-classical boundary with simpler nontrivial quantum system.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"204 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975386","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

Acoustic bilayer gradient metasurfaces for perfect and asymmetric beam splitting 用于完美和非对称分束的声学双层梯度元表面

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-14 DOI: 10.1088/0256-307x/41/1/014301

Jiaqi Quan, Baoyin Sun, Yangyang Fu, Lei Gao, Yadong Xu

引用次数: 0

Optical Nonlinearity of Violet Phosphorus and Applications in Fiber Laser 紫磷的光学非线性及其在光纤激光器中的应用

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-13 DOI: 10.1088/0256-307x/41/1/014202

Hui-ran Yang, Meng-ting Qi, Xu-peng Li, Ze Xue, Chen-hao Lu, Jia-wei Cheng, Dong-dong Han, Lu Li

引用次数: 0

Real-time observation of the instantaneous ac Stark shift of vacuum using a zeptosecond laser pulse 使用zeptosecond激光脉冲实时观测真空的瞬时交流斯塔克偏移

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-13 DOI: 10.1088/0256-307x/41/1/014201

Dandan Su, Miao Jiang

引用次数: 0

VASP2KP: $ kcdot p $ models and Landé $g$-factors from $ab-initio$ calculations VASP2KP: $ kcdot p $ 模型和来自 $ab-initio$ 计算的 Landé $g$ 因子

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-06 DOI: 10.1088/0256-307x/40/12/127101

Sheng Zhang, Haohao Sheng, Zhi-Da Song, Chenhao Liang, Yi Jiang, Song Sun, Quansheng Wu, Hongming Weng, Zhongyuan Fang, Xi Dai, Zhijun Wang

{"title":"VASP2KP: $ kcdot p $ models and Landé $g$-factors from $ab-initio$ calculations","authors":"Sheng Zhang, Haohao Sheng, Zhi-Da Song, Chenhao Liang, Yi Jiang, Song Sun, Quansheng Wu, Hongming Weng, Zhongyuan Fang, Xi Dai, Zhijun Wang","doi":"10.1088/0256-307x/40/12/127101","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127101","url":null,"abstract":"\u0000 The $kcdot p$ method is significant in condensed matter physics for the compact and analytical Hamiltonian.In the presence of magnetic field, it is described by effective Zeeman's coupling Hamiltonian with Landé $g$-factors. Here, we develop an $pen-source$ package VASP2KP (including two parts: vasp2mat and mat2kp) to compute $kcdot p$ parameters and Landé $g$-factors directly from the wavefunctions provided by the density functional theory (DFT) as implemented in Vienna $ab initio$ Simulation Package (VASP). First, we develop a VASP patch vasp2mat to compute matrix representations of the generalized momentum operator $boldsymbol{hat{pi}}=boldsymbol{hat{p}}+frac{1}{2mc^2}left(boldsymbol{hat{s}}timesnabla V(boldsymbol{r})right) $, spin operator $boldsymbol{hat{s}}$, time reversal operator $hat{T}$ and crystalline symmetry operators $hat{R}$ on the DFT wavefunctions. Second, we develop a python code mat2kp to obtain the unitary transformation $U$ that rotates the degenerate DFT basis towards the standard basis, and then automatically compute the $kcdot p$ parameters and $g$-factors. The theory and the methodology behind VASP2KP are described in detail. The matrix elements of the operators are derived comprehensively and computed correctly within the Projector Augmented Wave method. We apply this package to some materials, $e.g$.Bi$_2$Se$_3$, Na$_3$Bi, Te, InAs and 1H-TMD monolayers. The obtained effective model's dispersions are in good agreement with the DFT data around the specific wave vector, and the $g$-factors are consistent with experimental data. The VASP2KP package is available at https://github.com/zjwang11/VASP2KP.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"58 16","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597435","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

Effect of Age on Speech Perception in Noise Abilities Across Different Stimulus. 年龄对不同刺激条件下语音感知能力的影响。

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 Epub Date: 2023-07-18 DOI: 10.1007/s12070-023-04084-7

Banumathi, Supriya Mathew, Sandeep Kumar, Chandni Jain

{"title":"Effect of Age on Speech Perception in Noise Abilities Across Different Stimulus.","authors":"Banumathi, Supriya Mathew, Sandeep Kumar, Chandni Jain","doi":"10.1007/s12070-023-04084-7","DOIUrl":"10.1007/s12070-023-04084-7","url":null,"abstract":"<p><p>Various factors influence speech perception in noise (SPIN): age, hearing loss, cognition, background noise, stimulus redundancy, type of stimulus used, and signal-to-noise ratio. The effect of age on SPIN with different stimuli is yet to be validated in the literature. This study aims to study the effect of age on SPIN results across different stimuli. The study is a cross-sectional study with ninety participants with normal hearing ability. All participants in the study were equally divided into three groups: the children's group aged 8 to 12 years, the adult group aged 18 to 30, and the older adult group aged 55 to 72 years. Speech perception in the background of Kannada speech babble was assessed across three stimuli: monosyllables (CV), phonemically balanced Kannada words, and Kannada sentences. The stimulus was presented at 60 dBSPL binaurally through a calibrated headphone at 0 dB SNR. The result indicated a significant main effect of age on SPIN across syllables, words, and sentences. Further, Mann-Whitney test results revealed a statistically significant difference between the SPIN scores of children and adults for syllables, words, and sentences. Also, a statistical difference was noted in SPIN scores between adults and older adults for syllables, words, and sentences. However, statistical differences between children and older adults were seen only for syllables. The trend showed that the SPIN scores for syllables, words, and sentences improve from childhood to adulthood, while scores deteriorate from the adult to older adult group. A similar trend was seen for all three stimulus types. However, the reduction in the SPIN score using syllables in the older adult group was more noticeable than words and sentences. It can be concluded that there is an effect of age on SPIN abilities across different stimuli. It highlights the importance of age-appropriate SPIN normative for various stimuli.</p>","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"32 1","pages":"3718-3724"},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10646145/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82534060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Performance Improvement of a Direct Carbon Fuel Cell through an Irreversible Vacuum Thermionic Generator 通过不可逆真空热离子发生器提高直接碳燃料电池的性能

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/40/12/128201

Yuan Wang, Shanhe Su

引用次数: 0

Ultrafast Fiber Laser Based on Tungsten Sulphoselenide Materials 基于磺化硒化钨材料的超快光纤激光器

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/40/12/124202

Xiao-Chuan Meng, Lu Li, Nai-Zhang Sun, Ze Xue, Qi Liu, Han Ye, Wen-Jun Liu

{"title":"Ultrafast Fiber Laser Based on Tungsten Sulphoselenide Materials","authors":"Xiao-Chuan Meng, Lu Li, Nai-Zhang Sun, Ze Xue, Qi Liu, Han Ye, Wen-Jun Liu","doi":"10.1088/0256-307x/40/12/124202","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/124202","url":null,"abstract":"Tungsten sulphoselenide (WSSe) alloys, belonging to the transition metal dichalcogenide family, have attracted significant interest in the area of optoelectronics because of their unique optical and electronic properties. However, there has been a dearth of sufficient research on the saturable absorption features and ultrafast lasers applications. Herein, we fabricated a WSSe-microfiber saturable absorber (SA) based on WSSe nanosheets prepared by liquid exfoliation technique. The SA provided a saturation intensity of a modulation depth of 27.95% and a nonsaturable loss of 21.34%. To investigate the potential applications of WSSe in ultrafast photonics, the prepared WSSe-microfiber was incorporated into an Er-doped fiber laser ring cavity. The results demonstrated that the WSSe-based SA successfully generated mode-locking laser pulses with a remarkably short pulse width of 231 fs. Furthermore, the output power of this ultrafast fiber laser reached an impressive value of 15.68 mW. These findings provide valuable views into the unique features of WSSe alloys in the areas of ultrafast optics and develop recipes for SA in ultrafast fiber lasers.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055181","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