Pub Date : 2024-01-17DOI: 10.1088/0256-307x/41/2/020502
Zhi-Zeng Si, Chao-Qing Dai, Wei Liu
We report a passive mode-locked fiber laser which can realize single wavelength tuning and multi-wavelength spacing tuning simultaneously. The tuning range is from 1528 to 1560nm, up to three bands of soliton states can be output at the same time. These results are confirmed by nonlinear Schrödinger equation model based on splitstep Fourier method. In addition, we reveal a way to transform the multi-wavelength soliton state into Q-switched mode-locked state, which is period doubling. These results will promote the development of optical communication, optical sensing, multi-signal pulse emission.
{"title":"Tunable three-wavelength fiber laser and transient switching between three-wavelength soliton and Q-switched mode-locked states","authors":"Zhi-Zeng Si, Chao-Qing Dai, Wei Liu","doi":"10.1088/0256-307x/41/2/020502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/020502","url":null,"abstract":"\u0000 We report a passive mode-locked fiber laser which can realize single wavelength tuning and multi-wavelength spacing tuning simultaneously. The tuning range is from 1528 to 1560nm, up to three bands of soliton states can be output at the same time. These results are confirmed by nonlinear Schrödinger equation model based on splitstep Fourier method. In addition, we reveal a way to transform the multi-wavelength soliton state into Q-switched mode-locked state, which is period doubling. These results will promote the development of optical communication, optical sensing, multi-signal pulse emission.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 1224","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617304","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 : 2024-01-16DOI: 10.1088/0256-307x/41/2/027401
Feng Ran, Pan Chen, Dingyi Li, Peiyu Xiong, Zixin Fan, Haoming Ling, Yan Liang, Jiandi Zhang
Exploring dimensionality effects on cuprates is important for understanding the nature of high-temperature superconductivity. By atomically layer-by-layer growth with oxide molecular beam epitaxy, we demonstrate that La2-x Sr x CuO4 (x = 0.15) thin films remain superconducting down to 2 unit cells of thickness but quickly reach the maximum superconducting transition temperature at and above 4 unit cells. By fitting the critical magnetic field (μ 0 H c2), we show that the anisotropy of the film's superconductivity increases with decreasing film thickness, indicating that the superconductivity of the film gradually evolves from weak three- to two-dimensional character. These results help to gain more insight into the nature of high-temperature superconductivity with dimensionality.
探索铜氧化物的维度效应对于理解高温超导的本质非常重要。通过使用氧化物分子束外延技术进行原子逐层生长，我们证明了 La2-x Sr x CuO4（x = 0.15）薄膜在厚度为 2 个单元格时仍具有超导性，但在 4 个单元格及以上时会迅速达到最高超导转变温度。通过拟合临界磁场（μ 0 H c2），我们发现薄膜超导性的各向异性随着薄膜厚度的减小而增加，这表明薄膜的超导性逐渐从弱三维特性演变为二维特性。这些结果有助于我们更深入地了解高温超导的维度性质。
{"title":"Ultrathin Limit on the Anisotropic Superconductivity of Single-Layered Cuprate Films","authors":"Feng Ran, Pan Chen, Dingyi Li, Peiyu Xiong, Zixin Fan, Haoming Ling, Yan Liang, Jiandi Zhang","doi":"10.1088/0256-307x/41/2/027401","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/027401","url":null,"abstract":"\u0000 Exploring dimensionality effects on cuprates is important for understanding the nature of high-temperature superconductivity. By atomically layer-by-layer growth with oxide molecular beam epitaxy, we demonstrate that La2-x\u0000 Sr\u0000 x\u0000 CuO4 (x = 0.15) thin films remain superconducting down to 2 unit cells of thickness but quickly reach the maximum superconducting transition temperature at and above 4 unit cells. By fitting the critical magnetic field (μ\u0000 0\u0000 H\u0000 \u0000 c2), we show that the anisotropy of the film's superconductivity increases with decreasing film thickness, indicating that the superconductivity of the film gradually evolves from weak three- to two-dimensional character. These results help to gain more insight into the nature of high-temperature superconductivity with dimensionality.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139619251","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 : 2024-01-12DOI: 10.1088/0256-307x/41/2/024201
Wen-Kai Yu, Shuo-Fei Wang, Ke-Qian Shang
In the existing ghost-imaging-based cryptographic key distribution (GCKD) protocols, the cryptographic keys need to be encoded by using many modulated patterns, which undoubtedly incurs long measurement time and huge memory consumption. Given this, based on snapshot compressive ghost imaging, a public network cryptographic key distribution protocol is proposed, where the cryptographic keys and joint authentication information are encrypted into several color block diagrams to guarantee security. It transforms the previous single-pixel sequential multiple measurements into multi-pixel single exposure measurements, significantly reducing sampling time and memory storage. Both simulation and experimental results have demonstrated the feasibility of this protocol and its ability to detect illegal attacks. Therefore, it takes GCKD a big step closer to practical applications.
{"title":"Joint authentication public network cryptographic key distribution protocol based on single exposure compressive ghost imaging","authors":"Wen-Kai Yu, Shuo-Fei Wang, Ke-Qian Shang","doi":"10.1088/0256-307x/41/2/024201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/024201","url":null,"abstract":"\u0000 In the existing ghost-imaging-based cryptographic key distribution (GCKD) protocols, the cryptographic keys need to be encoded by using many modulated patterns, which undoubtedly incurs long measurement time and huge memory consumption. Given this, based on snapshot compressive ghost imaging, a public network cryptographic key distribution protocol is proposed, where the cryptographic keys and joint authentication information are encrypted into several color block diagrams to guarantee security. It transforms the previous single-pixel sequential multiple measurements into multi-pixel single exposure measurements, significantly reducing sampling time and memory storage. Both simulation and experimental results have demonstrated the feasibility of this protocol and its ability to detect illegal attacks. Therefore, it takes GCKD a big step closer to practical applications.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139623987","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 : 2024-01-12DOI: 10.1088/0256-307x/41/2/020501
Guiqiu Chen, Hong-cheng Wang, Hai-ming Deng, B. Malomed
This concise review summarizes recent advancements in theoretical studies of vortex quantum droplets (VQDs) in matter-wave fields. These are robust self-trapped vortical states in two- and three-dimensional (2D and 3D) Bose-Einstein condensates (BECs) with intrinsic nonlinearity. Stability of VQDs is provided by additional nonlinearities resulting from quantum fluctuations around mean-field states, often referred to as the Lee-Huang-Yang (LHY) corrections. The basic models are presented, with emphasis on the interplay between the mean-field nonlinearity, LHY correction, and spatial dimension, that determines the structure and stability of VQDs. We embark by delineating fundamental properties of VQDs in the 3D free space, followed by consideration of their counterparts in the 2D setting. Additionally, we address stabilization of matter-wave VQDs by optical potentials. Finally, we summarize results for the study of VQDs in the single-component BEC of atoms carrying magnetic moments. In that case, the anisotropy of the long-range dipole-dipole interactions endows the VQDs with unique characteristics. The results produced by the theoretical studies in this area directly propose experiments for the observation of novel physical effects in the realm of quantum matter, and suggest potential applications to the design of new schemes for processing classical and quantum information.
{"title":"Vortex quantum droplets under competing nonlinearities","authors":"Guiqiu Chen, Hong-cheng Wang, Hai-ming Deng, B. Malomed","doi":"10.1088/0256-307x/41/2/020501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/020501","url":null,"abstract":"\u0000 This concise review summarizes recent advancements in theoretical studies of vortex quantum droplets (VQDs) in matter-wave fields. These are robust self-trapped vortical states in two- and three-dimensional (2D and 3D) Bose-Einstein condensates (BECs) with intrinsic nonlinearity. Stability of VQDs is provided by additional nonlinearities resulting from quantum fluctuations around mean-field states, often referred to as the Lee-Huang-Yang (LHY) corrections. The basic models are presented, with emphasis on the interplay between the mean-field nonlinearity, LHY correction, and spatial dimension, that determines the structure and stability of VQDs. We embark by delineating fundamental properties of VQDs in the 3D free space, followed by consideration of their counterparts in the 2D setting. Additionally, we address stabilization of matter-wave VQDs by optical potentials. Finally, we summarize results for the study of VQDs in the single-component BEC of atoms carrying magnetic moments. In that case, the anisotropy of the long-range dipole-dipole interactions endows the VQDs with unique characteristics. The results produced by the theoretical studies in this area directly propose experiments for the observation of novel physical effects in the realm of quantum matter, and suggest potential applications to the design of new schemes for processing classical and quantum information.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139624350","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 : 2024-01-12DOI: 10.1088/0256-307x/41/2/027501
Ming-Shuang Li, Hui-Min Li, Song Liu
Two-dimensional (2D) magnetic materials have demonstrated excellent chemical, optical, electrical, and magnetic properties, particularly in the development of multifunctional electronic and spin electronic devices, showcasing tremendous potential. Therefore, the corresponding synthesis techniques for 2D magnetic materials that offer high quality, high yield, low cost, timesaving, and simplicity are highly desired. This review provides a comprehensive overview of recent research advances in the preparation of magnetic 2D materials, with a particular focus on the preparation methods employed. Moreover, the characteristics and applications of these magnetic materials are also discussed. Finally, the challenges and prospects of synthesis methods for magnetic 2D materials are briefly addressed. This review serves as a guiding reference for the controlled synthesis of 2D magnetic materials.
{"title":"Synthesis Methods and Property Control of Two-Dimensional Magnetic Materials","authors":"Ming-Shuang Li, Hui-Min Li, Song Liu","doi":"10.1088/0256-307x/41/2/027501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/027501","url":null,"abstract":"\u0000 Two-dimensional (2D) magnetic materials have demonstrated excellent chemical, optical, electrical, and magnetic properties, particularly in the development of multifunctional electronic and spin electronic devices, showcasing tremendous potential. Therefore, the corresponding synthesis techniques for 2D magnetic materials that offer high quality, high yield, low cost, timesaving, and simplicity are highly desired. This review provides a comprehensive overview of recent research advances in the preparation of magnetic 2D materials, with a particular focus on the preparation methods employed. Moreover, the characteristics and applications of these magnetic materials are also discussed. Finally, the challenges and prospects of synthesis methods for magnetic 2D materials are briefly addressed. This review serves as a guiding reference for the controlled synthesis of 2D magnetic materials.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139624807","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}
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