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Split Bregman quantum noise removal algorithm for 3D reconstruction of neutron computed tomography image 用于中子计算机断层扫描图像三维重建的分割布雷格曼量子噪声去除算法
Europhysics Letters Pub Date : 2024-02-21 DOI: 10.1209/0295-5075/ad2ba6
Tengfei Zhu, Yang Liu, Zhi Luo, Xiaoping Ouyang
{"title":"Split Bregman quantum noise removal algorithm for 3D reconstruction of neutron computed tomography image","authors":"Tengfei Zhu, Yang Liu, Zhi Luo, Xiaoping Ouyang","doi":"10.1209/0295-5075/ad2ba6","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2ba6","url":null,"abstract":"\u0000 The low intensity of the neutron source for neutron computed tomography (CT) results in a long acquisition time for a single projection, which causes the neutron projection data to contain a large amount of quantum noise. Quantum noise will degrade the quality of neutron CT reconstruction images. Therefore, an efficient quantum noise removal algorithm must be used in CT reconstruction. In this paper, an efficient quantum noise removal algorithm for neutron CT 3D image reconstruction is proposed by analysing classical image processing algorithms and quantum image processing algorithms, which employs the maximum likelihood expectation-maximization to reconstruct the image and split bregman to solve for the total variation (MLEM-SBTV). Experimental results show that MLEM-SBTV performs well in removing quantum noise and reconstructing the detailed structure of images.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"59 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444597","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}
引用次数: 0
Quadripartite quantum steering generated by single-pass cascaded nonlinear processes 由单通级联非线性过程产生的四方量子转向
Europhysics Letters Pub Date : 2024-02-21 DOI: 10.1209/0295-5075/ad2ba4
Y. R. Shen, Y. J. Jiang, X. Y. Cheng, J. W. Lv, Youbin Yu, G. Jin, A. Chen
{"title":"Quadripartite quantum steering generated by single-pass cascaded nonlinear processes","authors":"Y. R. Shen, Y. J. Jiang, X. Y. Cheng, J. W. Lv, Youbin Yu, G. Jin, A. Chen","doi":"10.1209/0295-5075/ad2ba4","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2ba4","url":null,"abstract":"\u0000 Quantum steering has become an important resource for quantum information due to its unique asymmetry. In this paper, quadripartite quantum steering generated by single-pass non-degenerate optical parametric amplification cascaded with a sum-frequency process is investigated. Firstly, idler beam is produced by different-frequency process between pump and signal. Secondly, sum-frequency beam is generated by cascaded sum-frequency process between idler and pump in the same optical superlattice. Quadripartite quantum steering among pump, signal, idler and sum-frequency beams id demonstrated based on the criterion for multipartite quantum steering. The influences of nonlinear coupling coefficients $kappa$, dimensionless propagation length $xi$, and the initial values of pump and signal on the variation characteristic of the quadripartite steering are also investigated. The results indicate that slightly larger nonlinear coupling coefficients of cascaded nonlinear processes and weaker signals can achieve better quadripartite quantum steering. This simple quadripartite quantum steering preparation scheme does not require a resonant cavity and is easier to implement experimentally, with potential applications in quantum communication and computing.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"125 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140443694","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}
引用次数: 0
Remarks on the (2 + 1)-dimensional Duffin-Kemmer-Petiau oscillator in an external magnetic field 关于外磁场中 (2 + 1) 维达芬-凯末尔-佩蒂奥振荡器的评论
Europhysics Letters Pub Date : 2024-02-21 DOI: 10.1209/0295-5075/ad2ba2
Andr'es G. Jir'on, Luis B. Castro, A. Obispo, A. S. D. Castro
{"title":"Remarks on the (2 + 1)-dimensional Duffin-Kemmer-Petiau oscillator in an external magnetic field","authors":"Andr'es G. Jir'on, Luis B. Castro, A. Obispo, A. S. D. Castro","doi":"10.1209/0295-5075/ad2ba2","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2ba2","url":null,"abstract":"\u0000 This work re-examines the issue of spin-1 particles in a (2 + 1)-dimensional Duffin-Kemmer-Petiau oscillator (DKPO) in the presence of an external magnetic field. By following the appropriate procedure for the spin-1 sector of the Duffin-Kemmer-Petiau (DKP) theory, the previously used 6×6 representation in the literature is shown to be reducible to a 3×3 irreducible representation. This approach enabled us to find new aspects of the results recently disseminated in various studies, as well as other considerations overlooked and requiring revision. Finally, we present some applications of two-dimensional DKP theory in condensed matter systems, particularly in Lieb lattices.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140442292","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}
引用次数: 0
Complete mode conversion of elastic waves by utilizing hexapole resonances in a double-scatterers structure 利用双散射体结构中的六极共振实现弹性波的完全模式转换
Europhysics Letters Pub Date : 2024-02-21 DOI: 10.1209/0295-5075/ad2ba5
Di Liu, Pai Peng
{"title":"Complete mode conversion of elastic waves by utilizing hexapole resonances in a double-scatterers structure","authors":"Di Liu, Pai Peng","doi":"10.1209/0295-5075/ad2ba5","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2ba5","url":null,"abstract":"\u0000 In recent years, the emergence of elastic metamaterial has provided new methods to manipulate the polarization of elastic waves, achieving elastic mode conversions. This paper theoretically investigates a complete mode conversion effect, where longitudinal waves are completely converted into transverse waves after being reflected by one layer of metamaterial slab. The slab structure contains a pair of cylinders, and the conversion is attributed to the out-of-phase coupled hexapole resonances of the two cylinders. Unlike the monopole, dipole, and quadrupole resonances, the hexapole resonances induce trivially, nearly constantly, effective parameters. The proposed design does not follow the recent popular “reversely designing parameters” method. The conversion based on the hexapole resonances is relatively broadband and wide-angle, which is beneficial for practical applications such as sound absorption.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"54 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140442239","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}
引用次数: 0
Hydrogenation-induced superconductivity in WS2 monolayer 氢化诱导的 WS2 单层超导电性
Europhysics Letters Pub Date : 2024-02-20 DOI: 10.1209/0295-5075/ad2af6
Geng-Run Gan, S. Fu, Chun-An Wang, Yapeng Xie, Xue‑Lian Gao, Lin-Han Wang, Yu-Lin Chen, Jia-Ying Chen
{"title":"Hydrogenation-induced superconductivity in WS2 monolayer","authors":"Geng-Run Gan, S. Fu, Chun-An Wang, Yapeng Xie, Xue‑Lian Gao, Lin-Han Wang, Yu-Lin Chen, Jia-Ying Chen","doi":"10.1209/0295-5075/ad2af6","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2af6","url":null,"abstract":"\u0000 Here, we construct a new two-dimensional hydrogenated transition metal dichalcogenide material, the Janus WSH monolayer, which is created by replacing the top-layer S atoms in the 2H-WS2 monolayer with H atoms. Then we use first-principles calculations to investigate its electronic structure, phonon dispersion, and superconductivity. The results show that hydrogenation breaks the reflection symmetry, which helps to orbital hybridization and flatten the electronic bands. Thus, it leads to a high electronic density of states near the Fermi level. Additionally, the electron-phonon coupling is enhanced by the softening of phonon modes from the in-plane vibrations of W. The strong interactions between electrons and phonons result in phonon-mediated superconductivity in Janus WSH monolayer. The calculated critical temperature (Tc) is approximately 23.1 K at atmospheric pressure. This Tc is about twice more than that of existing WS2-based materials.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"207 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140447774","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}
引用次数: 0
Nonlinear Landauer formula for thermal transport of the electrons 电子热传输的非线性兰道尔公式
Europhysics Letters Pub Date : 2024-02-15 DOI: 10.1209/0295-5075/ad29b4
Shihao Dong, kaixiang jia, Xinyu Liu, H. Geng, L. Sheng, D. Y. Xing
{"title":"Nonlinear Landauer formula for thermal transport of the electrons","authors":"Shihao Dong, kaixiang jia, Xinyu Liu, H. Geng, L. Sheng, D. Y. Xing","doi":"10.1209/0295-5075/ad29b4","DOIUrl":"https://doi.org/10.1209/0295-5075/ad29b4","url":null,"abstract":"\u0000 The Landauer formula, originally formulated in the context of linear transport, has been a powerful tool for studying quantum devices. However, recent research has shown that extending its application to nonlinear and nonreciprocal transport is crucial for a more comprehensive understanding. In this work, we develop a nonlinear Landauer formula for thermal transport of the electrons and apply it to investigate thermal transport in graphene. Our study reveals intriguing phenomena especially in the presence of large temperature gradients and at low system temperatures. At these conditions, higher-order nonlinear currents emerge, indicating the significance of nonlinear effects in thermal transport. Unlike thermoelectric conductivity, thermal conductivity can be decomposed into intrinsic and extrinsic terms. This decomposition is based on whether the contributions rely on the derivative of the transmission coefficient with respect to energy. This nonlinear Landauer formula presented here serves as a valuable tool for future investigations into the intricate interplay between temperature gradients, system temperatures, and thermal transport in quantum devices","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"824 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139835243","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}
引用次数: 0
Resonant type Luneburg lens for broadband low frequency focusing 用于宽带低频聚焦的共振型卢内堡透镜
Europhysics Letters Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2871
Liuxian Zhao, Xuxu Zhuang, Hao Guo, Chuanxing Bi, Zhaoyong Sun
{"title":"Resonant type Luneburg lens for broadband low frequency focusing","authors":"Liuxian Zhao, Xuxu Zhuang, Hao Guo, Chuanxing Bi, Zhaoyong Sun","doi":"10.1209/0295-5075/ad2871","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2871","url":null,"abstract":"\u0000 In this paper, a novel structural Luneburg lens with local resonators is proposed. This lens allows for the realization of subwavelength focusing in low frequency range. The lens is achieved by graded refractive index from the lens’s centre to the outer surface. Numerical simulations are conducted to obtain data on wave propagation waveform, maximum displacement amplitude, and full width at half maximum (FWHM) of the lens's focal region. The results show that a broadband frequency range can be achieved for subwavelength focusing. This provides a straightforward and adaptable method for designing the structural Luneburg lens for numerous applications.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"48 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844963","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}
引用次数: 0
Asymmetric acoustic splitting with the dual-layers of binary metagratings 双层二元晶格的非对称声学分裂
Europhysics Letters Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2870
Zhengang Liu, Shuai Chang, Shibei Xue, Fangfang Ju, Shengyou Qian
{"title":"Asymmetric acoustic splitting with the dual-layers of binary metagratings","authors":"Zhengang Liu, Shuai Chang, Shibei Xue, Fangfang Ju, Shengyou Qian","doi":"10.1209/0295-5075/ad2870","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2870","url":null,"abstract":"\u0000 Here, we exhibit the asymmetric acoustic splitting with the dual-layers of binary metagratings (BMs), i.e., BM1 and BM2. For the positive incidence (PI) normally from the BM1 side, acoustic waves are freely transmitted through the BM1 and split into two beams with the transmitted angles at θt = 45º and θt =−45º, then the two beams are freely transmitted through the BM2 with the transmitted angles at θt =−45º and θt = 45º. For the negative incidence (NI) normally from the BM2 side, acoustic waves are wholly reflected. Hence, the asymmetric acoustic splitting is observed. Here, the dual-layers of BMs are exemplified by the coating cells with different period lengths. Excellent agreement can be observed between the numerical simulations and the theoretical analysis. Our proposal may be applied in noise control and acoustic communication. Keywords: Acoustic asymmetric splitting, binary metagrating","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"249 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139843048","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}
引用次数: 0
Anomalous metallic conductivity and short-range ferromagnetic correlation in high-pressure synthesized pyrochlore Hg2Ir2O7 高压合成热绿石 Hg2Ir2O7 中的反常金属导电性和短程铁磁相关性
Europhysics Letters Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2872
Jianfa Zhao, Zhenghao Deng, Jun Zhang, Yi Peng, Luchuan Shi, B. Min, Lei Duan, Wenmin Li, Lipeng Cao, J. Chen, Zhiwei Hu, R. Yu, Changqing Jin
{"title":"Anomalous metallic conductivity and short-range ferromagnetic correlation in high-pressure synthesized pyrochlore Hg2Ir2O7","authors":"Jianfa Zhao, Zhenghao Deng, Jun Zhang, Yi Peng, Luchuan Shi, B. Min, Lei Duan, Wenmin Li, Lipeng Cao, J. Chen, Zhiwei Hu, R. Yu, Changqing Jin","doi":"10.1209/0295-5075/ad2872","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2872","url":null,"abstract":"\u0000 Iridates show fascinating properties due to the unpredictable ground states of their Ir cations. Generally, Ir5+(5d4) systems exhibit insulating nonmagnetic states owing to the strong spin-orbit coupling (SOC). Herein a new pyrochlore iridates Hg2Ir2O7 with an Ir5+ charge state synthesized by high-pressure technique is reported. Hg2Ir2O7 crystallizes in the typical cubic pyrochlore crystal structure. The Ir5+ valence state is evidenced by the XAS spectrum. Surprisingly, Hg2Ir2O7 displays short-range ferromagnetic correlations at low temperatures as evidenced by S-shape field-dependent magnetization curves, positive magnetoresistance, and magnetic excitations in specific heat. Furthermore, it also shows metallic conduction and large electron component of specific heat. These results all indicate that Ir5+ in Hg2Ir2O7 deviates from SOC-dominated insulating nonmagnetic states.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"77 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784614","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}
引用次数: 0
Resonant type Luneburg lens for broadband low frequency focusing 用于宽带低频聚焦的共振型卢内堡透镜
Europhysics Letters Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2871
Liuxian Zhao, Xuxu Zhuang, Hao Guo, Chuanxing Bi, Zhaoyong Sun
{"title":"Resonant type Luneburg lens for broadband low frequency focusing","authors":"Liuxian Zhao, Xuxu Zhuang, Hao Guo, Chuanxing Bi, Zhaoyong Sun","doi":"10.1209/0295-5075/ad2871","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2871","url":null,"abstract":"\u0000 In this paper, a novel structural Luneburg lens with local resonators is proposed. This lens allows for the realization of subwavelength focusing in low frequency range. The lens is achieved by graded refractive index from the lens’s centre to the outer surface. Numerical simulations are conducted to obtain data on wave propagation waveform, maximum displacement amplitude, and full width at half maximum (FWHM) of the lens's focal region. The results show that a broadband frequency range can be achieved for subwavelength focusing. This provides a straightforward and adaptable method for designing the structural Luneburg lens for numerous applications.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"117 51","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139785183","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}
引用次数: 0
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