发布求助
文献互助 智能选刊 最新文献

New Journal of Physics最新文献

筛选
英文 中文
Large-angle analytical solution of magnetization precession in ferromagnetic resonance 铁磁共振中磁化前冲的大角度解析解
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-11 DOI: 10.1088/1367-2630/ad7632
Zhen-Lin Jia, Shu-Chen Wang, Tong Li, Xiao-Wei Jin and De-Sheng Xue
{"title":"Large-angle analytical solution of magnetization precession in ferromagnetic resonance","authors":"Zhen-Lin Jia, Shu-Chen Wang, Tong Li, Xiao-Wei Jin and De-Sheng Xue","doi":"10.1088/1367-2630/ad7632","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7632","url":null,"abstract":"Dynamics of magnetization M driven by microwave are derived analytically from the nonlinear Landau–Lifshitz–Gilbert equation. Analytical M and susceptibility are obtained self-consistently under a positive circularly polarized microwave field, , with frequency , which is perpendicular to a static field, . It is found that the orbital of M is always a cone along H. However, with increasing h the polar angle of M initially increases, then keeps 90° when in ferromagnetic resonance (FMR) mode, where is Gilbert damping constant and is gyromagnetic ratio. These effects result in a nonlinear variation of FMR signal as h increases to , where the maximum of resonance peak decreases from a steady value, linewidth increases from a decreasing trend. These analytical solutions provide a complete picture of the dynamics of M with different h and H.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"12 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214693","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
Ultrafast artificial intelligence: machine learning with atomic-scale quantum systems 超快人工智能：利用原子尺度量子系统进行机器学习
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-11 DOI: 10.1088/1367-2630/ad7492
Thomas Pfeifer, Matthias Wollenhaupt and Manfred Lein
{"title":"Ultrafast artificial intelligence: machine learning with atomic-scale quantum systems","authors":"Thomas Pfeifer, Matthias Wollenhaupt and Manfred Lein","doi":"10.1088/1367-2630/ad7492","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7492","url":null,"abstract":"We train a model atom to recognize pixel-drawn digits based on hand-written numbers in the range 0–9, employing intense light–matter interaction as a computational resource. For training, the images of the digits are converted into shaped laser pulses (data input pulses). Simultaneously with an input pulse, another shaped pulse (program pulse), polarized in the orthogonal direction, is applied to the atom and the system evolves quantum mechanically according to the time-dependent Schrödinger equation. The purpose of the optimal program pulse is to direct the system into specific atomic final states (classification states) that correspond to the input digits. A success rate of about 40% is achieved when using a basic optimization scheme that might be limited by the computational resources for finding the optimal program pulse in a high-dimensional search space. Our key result is the demonstration that the laser-programmed atom is able to generalize, i.e. successful classification is not limited to the training examples, but also the classification of previously unseen images is improved by training. This atom-sized machine-learning image-recognition scheme operates on time scales down to tens of femtoseconds, is scalable towards larger (e.g. molecular) systems, and is readily reprogrammable towards other learning/classification tasks. An experimental implementation of the scheme using ultrafast polarization pulse shaping and differential photoelectron detection is within reach.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"418 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214687","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
Valley-polarized edge plasmons in graphene p–n junctions with pseudomagnetic fields 具有伪磁场的石墨烯 p-n 结中的谷极化边缘质子
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-11 DOI: 10.1088/1367-2630/ad762f
Ya Zhang, Feng Zhai and Wei Jiang
{"title":"Valley-polarized edge plasmons in graphene p–n junctions with pseudomagnetic fields","authors":"Ya Zhang, Feng Zhai and Wei Jiang","doi":"10.1088/1367-2630/ad762f","DOIUrl":"https://doi.org/10.1088/1367-2630/ad762f","url":null,"abstract":"Owing to the inherent characteristics of collective excitations in graphene, electrical control of edge plasmons is highly desirable for nanoplasmonic applications. This study investigates valley-polarized edge pseudomagnetoplasmons in a graphene p–n junction subjected to a strain-induced pseudomagnetic field. A four-component hydrodynamic model is employed and solved via the Wiener–Hopf method, revealing the coexistence of three plasmon modes, including counterpropagating acoustic edge modes, gapless topological edge states, and zero modes. The valley polarization, as determined from the numerically exact solution, is stronger than that predicted by the approximate models. Notably, the confinement of edge plasmons at the graphene p–n junction significantly exceeds that at the graphene/vacuum interface, possibly because of the electron–hole attraction. Furthermore, gate-controlled subwavelength confinement is successfully achieved by applying an appropriate gate voltage, thereby highlighting a unique and promising attribute of edge pseudomagnetoplasmons in graphene p–n junctions.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"6 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214691","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
Phase diagram of strongly-coupled Rashba systems 强耦合拉什巴系统的相图
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-10 DOI: 10.1088/1367-2630/ad7630
B K Nally and P M R Brydon
{"title":"Phase diagram of strongly-coupled Rashba systems","authors":"B K Nally and P M R Brydon","doi":"10.1088/1367-2630/ad7630","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7630","url":null,"abstract":"Motivated by the recent discovery of a possible field-mediated parity switch within the superconducting state of CeRh2As2 (Khim et al 2021 Science373 1012), we thoroughly investigate the dependence of the superconducting state of a strongly-coupled Rashba mono- and bilayer on internal parameters and an applied magnetic field. The role of interlayer pairing, spin orbit coupling, doping rate and applied magnetic field and their interplay was examined numerically at low temperature within a t-J-like model, uncovering complex phase diagrams and transitions between superconducting states with different symmetry.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"274 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214694","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
Room-temperature spontaneous perpendicular exchange bias in IrMn/[Co/Pt]3 multilayers IrMn/[Co/Pt]3 多层中的室温自发垂直交换偏压
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-10 DOI: 10.1088/1367-2630/ad7636
Jiabin Wang, Xilai Bao, Jinxia Chen, Mengting Zou, Yali Xie, Run-Wei Li, Xiaoguang Li, Yanwei Cao and Baomin Wang
{"title":"Room-temperature spontaneous perpendicular exchange bias in IrMn/[Co/Pt]3 multilayers","authors":"Jiabin Wang, Xilai Bao, Jinxia Chen, Mengting Zou, Yali Xie, Run-Wei Li, Xiaoguang Li, Yanwei Cao and Baomin Wang","doi":"10.1088/1367-2630/ad7636","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7636","url":null,"abstract":"Perpendicular exchange bias (PEB) is highly desirable for the development of advanced nanoscale spintronics devices. The attainment of conventional PEB typically involves a field-cooling process through the Néel temperature of antiferromagnetic materials. In this study, we demonstrated the realization of spontaneous PEB (SPEB) in IrMn/[Co/Pt]3 multilayers utilizing isothermal crystallization of IrMn at room temperature (RT). And the SPEB generated isothermally at IrMn/Co interface does not destroy the perpendicular magnetic anisotropy of the multilayers. The magnetic domains of the multilayers captured by Kerr microscopy after different magnetization time also indicate the generation of SPEB. The magnitude of SPEB can be controllable by varying the isothermal magnetization time and the annealing temperature of IrMn. The relationship between magnetization waiting time and SPEB reveals that even slight isothermal crystallization can generate substantial SPEB. Our results provide an alternative approach to isothermally generate PEB in IrMn/[Co/Pt]3 multilayers at RT.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"21 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214696","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
Relation between photoionisation cross sections and attosecond time delays 光电离截面与阿秒时间延迟之间的关系
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-10 DOI: 10.1088/1367-2630/ad7633
Jia-Bao Ji, Anatoli S Kheifets, Meng Han, Kiyoshi Ueda and Hans Jakob Wörner
{"title":"Relation between photoionisation cross sections and attosecond time delays","authors":"Jia-Bao Ji, Anatoli S Kheifets, Meng Han, Kiyoshi Ueda and Hans Jakob Wörner","doi":"10.1088/1367-2630/ad7633","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7633","url":null,"abstract":"Determination and interpretation of Wigner-like photoionisation delays is one of the most active fields of attosecond science. Previous results have suggested that large photoionisation delays are associated with structured continua, but a quantitative relation between photoionisation cross sections and time delays has been missing. Here, we derive a Kramers–Kronig-like relation between these quantities and demonstrate its validity for (anti)resonances. This new concept defines a topological analysis, which rationalises the sign of photoionisation delays and thereby sheds new light on a long-standing controversy regarding the sign of the photoionisation delay near the Ar 3s Cooper minimum. Our work bridges traditional photoionisation spectroscopy with attosecond chronoscopy and offers new methods for analysing and interpreting photoionisation delays.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"59 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214695","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
Mode pairing quantum key distribution with light source monitoring 带光源监测的模式配对量子密钥分发
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-09 DOI: 10.1088/1367-2630/ad7493
Zhenhua Li, Tianqi Dou, Yuheng Xie, Weiwen Kong, Na Chen, Qi Zhao, Wenpeng Gao, Peizhe Han, Yuanchen Hao, Haiqiang Ma, Yang Liu, Jianjun Tang
{"title":"Mode pairing quantum key distribution with light source monitoring","authors":"Zhenhua Li, Tianqi Dou, Yuheng Xie, Weiwen Kong, Na Chen, Qi Zhao, Wenpeng Gao, Peizhe Han, Yuanchen Hao, Haiqiang Ma, Yang Liu, Jianjun Tang","doi":"10.1088/1367-2630/ad7493","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7493","url":null,"abstract":"Mode pairing quantum key distribution (MP-QKD) overcomes the repeaterless bound without requiring phase locking and phase tracking. However, MP-QKD still assumes that the light source is trusted, which can present challenges in practical deployments and potentially introduce security vulnerabilities. In this paper, we propose a light source monitoring (LSM) scheme that guarantees the security of MP-QKD with the untrusted light sources. The simulation results demonstrate that, when considering untrusted light sources, the performance of MP-QKD with the LSM scheme remains nearly identical to that of ideal MP-QKD, even in the presence of the source fluctuations. Furthermore, we simplify some of the complex integration calculations involved in simulating the observed quantities of MP-QKD, which reduces the running time of the parameter optimization procedure.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"101 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214698","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
Enhancing quantum time transfer security: detecting intercept-resend attacks with energy-time entanglement 增强量子时间传输安全性：利用能量-时间纠缠检测拦截-发送攻击
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-09 DOI: 10.1088/1367-2630/ad7634
Runai Quan, Huibo Hong, Xiao Xiang, Mingtao Cao, Xinghua Li, Baihong Li, Ruifang Dong, Tao Liu and Shougang Zhang
{"title":"Enhancing quantum time transfer security: detecting intercept-resend attacks with energy-time entanglement","authors":"Runai Quan, Huibo Hong, Xiao Xiang, Mingtao Cao, Xinghua Li, Baihong Li, Ruifang Dong, Tao Liu and Shougang Zhang","doi":"10.1088/1367-2630/ad7634","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7634","url":null,"abstract":"Quantum time transfer has emerged as a powerful technique, offering sub-picosecond precision and inherent security through the nonlocal temporal correlation property of energy-time entangled biphoton sources. In this paper, we demonstrate the inherent security advantage of quantum time transfer, and the utilization in detecting potential intercept-resend attacks. By investigating the impact of these attacks on the nonlocality identifier associated with nonlocal dispersion cancellation of energy-time entanglement, we establish a security threshold model for detecting intercept-resend attacks. Experimental verification on a 102 km fiber-optic link confirms that even a malicious delay as small as 25 ps can be identified. This investigation serves as a compelling illustration of secure two-way time transfer, safeguarding against intercept-resend attacks, and showcasing its potential applications in fields reliant on authentic time distribution between remote parties.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"78 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214697","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
Superquantization rule for multistability in driven-dissipative quantum systems 驱动耗散量子系统多稳定性的超量化规则
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-06 DOI: 10.1088/1367-2630/ad748f
Nikolett Német, Árpád Kurkó, András Vukics, Péter Domokos
{"title":"Superquantization rule for multistability in driven-dissipative quantum systems","authors":"Nikolett Német, Árpád Kurkó, András Vukics, Péter Domokos","doi":"10.1088/1367-2630/ad748f","DOIUrl":"https://doi.org/10.1088/1367-2630/ad748f","url":null,"abstract":"We present a superquantization rule which indicates the possible robust stationary states of a generic driven-dissipative quantum system. Multistability in a driven cavity mode interacting with a qudit is revealed hence within a simple intuitive picture. The accuracy of the superquantization approach is confirmed by numerical simulations of the underlying quantum model. In the case when the qudit is composed of several two-level emitters coupled homogeneously to the cavity, we demonstrate the robustness of the superquantized steady states to single-emitter decay.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"96 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214494","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
Coulomb excitation of hydrogen atoms by vortex ion beams 涡旋离子束对氢原子的库仑激发
IF 3.3 2区 物理与天体物理
New Journal of Physics Pub Date : 2024-09-06 DOI: 10.1088/1367-2630/ad73fd
A V Maiorova, D Karlovets, S Fritzsche, A Surzhykov, Th Stöhlker
{"title":"Coulomb excitation of hydrogen atoms by vortex ion beams","authors":"A V Maiorova, D Karlovets, S Fritzsche, A Surzhykov, Th Stöhlker","doi":"10.1088/1367-2630/ad73fd","DOIUrl":"https://doi.org/10.1088/1367-2630/ad73fd","url":null,"abstract":"Coulomb excitation of hydrogen atoms by vortex protons is theoretically investigated within the framework of the non-relativistic first–Born approximation and the density matrix approach. Special attention is paid to the magnetic sublevel population of excited atoms and, consequently, to the angular distribution of the fluorescence radiation. We argue that both these properties are sensitive to the projection of the orbital angular momentum (OAM), carried by the projectile ions. In order to illustrate the OAM–effect, detailed calculations have been performed for the <inline-formula>\u0000<tex-math><?CDATA $1s to 2p$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mn>1</mml:mn><mml:mi>s</mml:mi><mml:mo accent=\"false\" stretchy=\"false\">→</mml:mo><mml:mn>2</mml:mn><mml:mi>p</mml:mi></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad73fdieqn1.gif\"></inline-graphic></inline-formula> excitation and the subsequent <inline-formula>\u0000<tex-math><?CDATA $2p to 1s$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mn>2</mml:mn><mml:mi>p</mml:mi><mml:mo accent=\"false\" stretchy=\"false\">→</mml:mo><mml:mn>1</mml:mn><mml:mi>s</mml:mi></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad73fdieqn2.gif\"></inline-graphic></inline-formula> radiative decay of a hydrogen target, interacting with incident Laguerre–Gaussian vortex protons. The calculation results suggest that Coulomb excitation can be employed for the diagnostics of vortex ion beam at accelerator and storage ring facilities.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"26 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214700","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信