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Measurement of infrared magic wavelength for an all-optical trapping of 40Ca+ ion clock 测量 40Ca+ 离子全光捕获时钟的红外魔力波长
New Journal of Physics Pub Date : 2024-04-15 DOI: 10.1088/1367-2630/ad3ea8
Yao Huang, Miao Wang, Zheng Chen, Cheng-bin Li, Huaqing Zhang, Baolin Zhang, Liyan Tang, Ting-Yun Shi, H. Guan, Ke-lin Gao
{"title":"Measurement of infrared magic wavelength for an all-optical trapping of 40Ca+ ion clock","authors":"Yao Huang, Miao Wang, Zheng Chen, Cheng-bin Li, Huaqing Zhang, Baolin Zhang, Liyan Tang, Ting-Yun Shi, H. Guan, Ke-lin Gao","doi":"10.1088/1367-2630/ad3ea8","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3ea8","url":null,"abstract":"\u0000 For the first time, we experimentally determine the infrared magic wavelength for the 40Ca+ 4s\u0000 2\u0000 S\u0000 (1/2) → 3d\u0000 2\u0000 S\u0000 (5/2) electric quadrupole transition by observation of the light shift canceling in 40Ca+ optical clock. A “magic” magnetic field direction is chosen to make the magic wavelength insensitive to both the linear polarization purity and the polarization direction of the laser. The determined magic wavelength for this transition is 1056.37(9) nm, which is not only in good agreement with theoretical predictions (“DFCP” method) but also more precise by a factor of about 300. Using this measured magic wavelength, we also derive the differential static polarizability to be -44.32(32) a.u., which will be an important input for the evaluation of the blackbody radiation shift at room temperatures. Our work paves a way for all-optical-trapping of 40Ca+ optical clock.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"41 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140701858","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
The Kondo Scaling for Spin Thermocurrent in Strongly Correlated Electron Systems 强相关电子系统中自旋热电流的 Kondo Scaling
New Journal of Physics Pub Date : 2024-04-12 DOI: 10.1088/1367-2630/ad3e21
ZhenHua Li, yurong zeng, Yongxi Cheng, Xiao Zheng, Jianhua Wei, Hongtian Luo, YiJing Yan
{"title":"The Kondo Scaling for Spin Thermocurrent in Strongly Correlated Electron Systems","authors":"ZhenHua Li, yurong zeng, Yongxi Cheng, Xiao Zheng, Jianhua Wei, Hongtian Luo, YiJing Yan","doi":"10.1088/1367-2630/ad3e21","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3e21","url":null,"abstract":"\u0000 One of the most important feature in the Kondo physics is the universal scaling behavior. In this study, we analyze the transport behavior of the spin thermocurrent driven by a small temperature bias and under a weak magnetic field. We conclude that the spin thermocurrent exhibits a universal scaling behavior, similar to the spin susceptibility. The validity of our conclusion is also checked by using the numerically exact hierarchical equations of motion approach. From our fitting result of the scaling function, it is found that the Kondo temperature can be determined by the maximum of the spin thermocurrent at T/TK = 0.383.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"15 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140710359","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
Does anti-Unruh effect assist quantum entanglement and coherence? 反乌鲁赫效应是否有助于量子纠缠和相干性？
New Journal of Physics Pub Date : 2024-04-11 DOI: 10.1088/1367-2630/ad3d7b
Shu-Min Wu, Xiao-Wei Teng, Jin-Xuan Li, Hao-Sheng Zeng, Tonghua Liu
{"title":"Does anti-Unruh effect assist quantum entanglement and coherence?","authors":"Shu-Min Wu, Xiao-Wei Teng, Jin-Xuan Li, Hao-Sheng Zeng, Tonghua Liu","doi":"10.1088/1367-2630/ad3d7b","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3d7b","url":null,"abstract":"\u0000 In this paper, we use the concepts of quantum entanglement and coherence to analyze the Unruh and anti-Unruh effects based on the model of Unruh-DeWitt detector. For the first time, we find that (i) the Unruh effect reduces quantum entanglement but enhances quantum coherence; (ii) the anti-Unruh effect enhances quantum entanglement but reduces quantum coherence. This surprising result refutes the notion that the Unruh effect can only destroy quantum entanglement and coherence simultaneously, and that the anti-Unruh can only protect quantum resources. Consequently, it opens up a new source for discovering experimental evidence supporting the existence of the Unruh and anti-Unruh effects.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"27 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140713138","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
Tuning the lattice thermal conductivity of Janus SnSSe by interlayer twisting: a machine-learning-based study 通过层间扭转调节 Janus SnSSe 的晶格热导率：基于机器学习的研究
New Journal of Physics Pub Date : 2024-04-09 DOI: 10.1088/1367-2630/ad3c66
Yufeng Luo, Haibin Cao, Mengke Li, H. Yuan, Huijun Liu
{"title":"Tuning the lattice thermal conductivity of Janus SnSSe by interlayer twisting: a machine-learning-based study","authors":"Yufeng Luo, Haibin Cao, Mengke Li, H. Yuan, Huijun Liu","doi":"10.1088/1367-2630/ad3c66","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3c66","url":null,"abstract":"\u0000 Twisted two-dimensional materials have recently attracted tremendous interest owing to their unique structures and fantastic electronic properties. However, the effect of interlayer twisting on the phonon transport properties is less known, especially for the twist-angle-dependent lattice thermal conductivity (κL). Using the emerging Janus SnSSe bilayer as a prototypical example, we develop an accurate machine learning potential, which is adopted to efficiently predict the κL at a series of twist angles via iterative solution of the Boltzmann transport equation. It is found that the κL exhibits a distinct non-monotonous dependence on the twist angle, which can be traced back to the bonding heterogeneity between high-symmetry stacking regions inside the moiré unit cell. In contrast to the general belief, the optical phonons make a major contribution toward the κL of the twisted structures. Moreover, we demonstrate that four-phonon scattering can significantly reduce the κL of SnSSe bilayer at higher temperatures, which becomes more pronounced by interlayer twisting. Our work not only highlights the strong predictive power of machine learning potential, but also offers new insights into the design of thermal smart materials with tunable κL.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"13 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140721437","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
Tunable Band Alignment and Optical Properties in Van der Waals Heterostructures based on two-dimensional materials Janus-MoSSe and C3N4 基于二维材料 Janus-MoSSe 和 C3N4 的范德华异质结构中的可调谐带排列和光学特性
New Journal of Physics Pub Date : 2024-04-09 DOI: 10.1088/1367-2630/ad3c65
Shida Pei, Rufeng Cao, Yanhong Zhou, Xiaohong Zheng, Caiyun Wang
{"title":"Tunable Band Alignment and Optical Properties in Van der Waals Heterostructures based on two-dimensional materials Janus-MoSSe and C3N4","authors":"Shida Pei, Rufeng Cao, Yanhong Zhou, Xiaohong Zheng, Caiyun Wang","doi":"10.1088/1367-2630/ad3c65","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3c65","url":null,"abstract":"\u0000 van der Waals heterostructures with tunable band alignments are the promising candidates for the fabrication of high-performance multifunctional nano-optoelectronic devices. In this work, we investigate the band alignments and optical properties of two-dimensional MoSSe/C{$_{3}$}N{$_{4}$} and C{$_{3}$}N{$_{4}$}/MoSSe heterostructures using first-principles methods. The two most stable MoSSe/C{$_{3}$}N{$_{4}$} (C{$_{3}$}N{$_{4}$}-Se) and C{$_{3}$}N{$_{4}$}/MoSSe (C{$_{3}$}N{$_{4}$}-S) heterostructures (labeled as A2 and B2, respectively) out of the twelve possible heterostructures are selected for the corresponding properties research. It is found that the A2 exhibits type-I band alignment, making it suitable for light-emitting applications, while the B2 exhibits typical type-II band alignment, which is favorable for carrier separation. Moreover, the band alignment of the two heterostructures can be modulated by the external electric fields, that is, band alignment transition between type-I and type-II. In addition, the main absorption peaks of both heterostructures in their pristine state are located in the visible light region (approximately 2.9 eV), and the peak values of the absorption peaks can be enhanced (weaken) via applying positive (negative) external electric fields. Our findings demonstrate that the C{$_{3}$}N{$_{4}$}/C{$_{3}$}N{$_{4}$} and C{$_{3}$}N{$_{4}$}/MoSSe heterostructures hold significant potential for applications in multifunctional electronic devices including light-emitting, carrier separation, optical modulators, etc.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"55 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140721765","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
Spin-orbit coupling effects on localization and correlated tunneling for two interacting bosons in a double-well potential 自旋轨道耦合对双阱势中两个相互作用玻色子的局域化和相关隧穿的影响
New Journal of Physics Pub Date : 2024-04-08 DOI: 10.1088/1367-2630/ad3be3
Hongzheng Wu, Xing Yan, Changwei Fan, Baiyuan Yang, Jin-Peng Xiao, Zhao-Yun Zeng, Yajiang Chen, Xiaobing Luo
{"title":"Spin-orbit coupling effects on localization and correlated tunneling for two interacting bosons in a double-well potential","authors":"Hongzheng Wu, Xing Yan, Changwei Fan, Baiyuan Yang, Jin-Peng Xiao, Zhao-Yun Zeng, Yajiang Chen, Xiaobing Luo","doi":"10.1088/1367-2630/ad3be3","DOIUrl":"https://doi.org/10.1088/1367-2630/ad3be3","url":null,"abstract":"\u0000 We theoretically study the tunneling dynamics of two interacting spin-orbit-coupled atoms trapped in a periodically perturbed double-well potential. We find that the phenomenon of coherent destruction of tunneling (CDT) can exist only for certain values of spin-orbit coupling (SOC), and two different mechanisms for the appearance of CDT are identified in this system. One is the conventional CDT resulting from quasi-energy degeneracy, while the other CDT originates from the dark Floquet state with zero quasi-energy for all values of the driving parameters. We discover that under double modulation combining the double-well potential shaking and a time-periodic Zeeman field, it is possible to realize spin-flipping single-atom Rabi tunneling and the CDT induced by the dark Floquet state at any value of SOC strength, which is not accessible with a single-drive field. Furthermore, we show that the detuning of Zeeman field with respect to the multiphoton energy is particularly significant in the case of the correlated two-particle tunneling mediated by SOC. We expect that these results will stimulate further exploration of the many-body dynamics in the interacting systems and expand the possibilities for manipulating the spin dynamics.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"204 1‐6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140730713","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
En route to superhard and 1D conductive carbon allotropes via unusualsp2-sp3 bonding configuration 通过非同寻常的 sp2-sp3 键构型实现超硬和一维导电碳异构体的途径
New Journal of Physics Pub Date : 2024-03-20 DOI: 10.1088/1367-2630/ad35df
Yujia Wang, Xingyu Wang, Jinyu Liu, Xinxin Zhang, Miao Zhang, Hanyu Liu
{"title":"En route to superhard and 1D conductive carbon allotropes via unusualsp2-sp3 bonding configuration","authors":"Yujia Wang, Xingyu Wang, Jinyu Liu, Xinxin Zhang, Miao Zhang, Hanyu Liu","doi":"10.1088/1367-2630/ad35df","DOIUrl":"https://doi.org/10.1088/1367-2630/ad35df","url":null,"abstract":"\u0000 Carbon structures with sp2-sp3 hybrid bonds were expected to exhibit both excellent mechanical and electronic properties. Here, we theoretically design several unique carbon structures, which contain unusual sp2-sp3 hybrid bonds. We found that the introduction of sp2 bonding units into carbon structure with sp3 bonding can tune the electronic densities of state at Fermi level, especially resulting in 1D conductive channels in 3D structures. Further simulations indicate that Vickers hardness of these structures is close to diamond via the increase in sp3 building blocks. Our current work provides insights into the design of carbon structures with both excellent superhard and remarkably metallic properties.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"77 S338","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140224285","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
Bogoliubov corner excitations in a conventional s-wave superfluid 常规 s 波超流体中的波哥留布夫角激波
New Journal of Physics Pub Date : 2024-03-20 DOI: 10.1088/1367-2630/ad35e0
Wei Tu, Yajie Wu, Ning Li, Miaodi Guo, Junpeng Hou
{"title":"Bogoliubov corner excitations in a conventional s-wave superfluid","authors":"Wei Tu, Yajie Wu, Ning Li, Miaodi Guo, Junpeng Hou","doi":"10.1088/1367-2630/ad35e0","DOIUrl":"https://doi.org/10.1088/1367-2630/ad35e0","url":null,"abstract":"\u0000 Higher-order topological superconductors and superfluids have triggered a great deal of interest in recent years. While Majorana zero-energy corner or hinge states have been studied intensively, whether superconductors and superfluids, being topological or trivial, host higher-order topological Bogoliubov excitations with finite energies remain elusive. In this work, we propose that Bogoliubov corner excitations with finite energies can be induced through only mirror-symmetric local potentials from a trivial conventional s-wave superfluid. The topological Bogoliubov excited modes originate from the nontrivial Bogoliubov excitation bands. These modes are protected by mirror symmetry and are robust against mirror-symmetric perturbations as long as the Bogoliubov energy gap remains open. Our work provides a new insight into higher-order topological excitation states in superfluids and superconductors.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"11 S9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140224675","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
Goos-Hänchen shifts on spin representation 自旋表征上的戈斯-哈芬变换
New Journal of Physics Pub Date : 2024-03-20 DOI: 10.1088/1367-2630/ad360f
Ze Chen, Xiaoguang Zhang, Hu Zhang, Yang Meng, Weiming Zhen
{"title":"Goos-Hänchen shifts on spin representation","authors":"Ze Chen, Xiaoguang Zhang, Hu Zhang, Yang Meng, Weiming Zhen","doi":"10.1088/1367-2630/ad360f","DOIUrl":"https://doi.org/10.1088/1367-2630/ad360f","url":null,"abstract":"\u0000 We analyze the Goos-Hänchen (GH) shift and longitudinal spin splitting (LSS) at a planar interface between two optical media in the spin representation. While these optical effects have been studied previously, we examine the direct and cross-reflected light fields, and their interference from the spin representation to reveal the physical mechanism of the GH shift and establish a quantitative relationship between it and LSS. Furthermore, we show that angular asymmetric spin splitting occurs under the spin representation when linearly polarized light with a phase difference of 180 degrees and an amplitude ratio angle deviating from 45 degrees impinges on the air-glass interface at Brewster’s angle. Finally, we reveal that the spin component field of the reflected light field for the total reflection case is different from that of the Brewster angle reflection, the most typical manifestation is that the intensity of the two spin component fields is not equal.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"321 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228261","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
Unveiling surface and bulk contributions in temperature dependent THz emission from Bi2Te3 揭示 Bi2Te3 太赫兹发射随温度变化的表面和体质贡献
New Journal of Physics Pub Date : 2024-03-15 DOI: 10.1088/1367-2630/ad345a
A. Nivedan, Sunil Kumar
{"title":"Unveiling surface and bulk contributions in temperature dependent THz emission from Bi2Te3","authors":"A. Nivedan, Sunil Kumar","doi":"10.1088/1367-2630/ad345a","DOIUrl":"https://doi.org/10.1088/1367-2630/ad345a","url":null,"abstract":"\u0000 We report evolution of the pulsed terahertz (THz) emission from Bi2Te3 topological insulator in a wide temperature range, where an interplay between the surface and bulk contributions can be addressed in a distinguishable manner. A circular photogalvanic effect-induced surface current contribution to THz generation can be clearly identified in the signal, otherwise, overwhelmed by the hot carrier decoherence in the bulk states. With the decreasing temperature, an initial sharp increase in the surface THz signal is observed before it attains a constant value below ~200 K. The bulk-to-surface scattering channels via carrier-phonon scattering are dominant only above the bulk-Debye temperature of ~180 K, and the temperature-independent behavior of it at lower temperatures is indicative of robust nature of topological surface states. THz emission due to ultrafast photon drag current in the bulk states is almost independent of temperature in the entire range, while the combined photo-Dember and band-bending effects induced photocurrent is doubled at 10 K.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"27 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237441","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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