New Journal of Physics最新文献

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"title":"Fate of localization features in a one-dimensional non-Hermitian flat-band lattice with quasiperiodic modulations","authors":"Hui Liu, Zhanpeng Lu, Xu Xia, Zhihao Xu","doi":"10.1088/1367-2630/ad7529","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7529","url":null,"abstract":"We investigate the influence of quasiperiodic modulations on one-dimensional non-Hermitian diamond lattices with an artificial magnetic flux <italic toggle=\"yes\">θ</italic> that possess flat bands. Our study shows that the symmetry of these modulations and the magnetic flux <italic toggle=\"yes\">θ</italic> play a pivotal role in shaping the localization properties of the system. When <italic toggle=\"yes\">θ</italic> = 0, the non-Hermitian lattice exhibits a single flat band in the crystalline case, and symmetric as well as antisymmetric modulations can induce accurate mobility edges. In contrast, when <inline-formula>\u0000<tex-math><?CDATA $theta = pi$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mi>θ</mml:mi><mml:mo>=</mml:mo><mml:mi>π</mml:mi></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad7529ieqn1.gif\"></inline-graphic></inline-formula>, the clean diamond lattice manifests three dispersionless bands referred to as an ‘all-band-flat’ (ABF) structure, irrespective of the non-Hermitian parameter. The ABF structure restricts the transition from delocalized to localized states, as all states remain localized for any finite symmetric modulation. Our numerical calculations further unveil that the ABF system subjected to antisymmetric modulations exhibits multifractal-to-localized edges. Multifractal states are predominantly concentrated in the internal region of the spectrum. Additionally, we explore the case where <italic toggle=\"yes\">θ</italic> lies within the range of <inline-formula>\u0000<tex-math><?CDATA $(0, pi)$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mo stretchy=\"false\">(</mml:mo><mml:mn>0</mml:mn><mml:mo>,</mml:mo><mml:mi>π</mml:mi><mml:mo stretchy=\"false\">)</mml:mo></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad7529ieqn2.gif\"></inline-graphic></inline-formula>, revealing a diverse array of complex localization features. Finally, we propose a classical electrical circuit scheme to realize the non-Hermitian flat-band chain with quasiperiodic modulations.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"5 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214495","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}

{"title":"Multiple magnetic orders discovered in the superconducting state of EuFe2(As 1−x P x)2","authors":"Nan Zhou, Yue Sun, Ivan S Veshchunov, S Kittaka, X L Shen, H M Ma, W Wei, Y Q Pan, M Cheng, Y F Zhang, Y Kono, Yuping Sun, T Tamegai, Xuan Luo, Zhixiang Shi, Toshiro Sakakibara","doi":"10.1088/1367-2630/ad7494","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7494","url":null,"abstract":"The interplay between superconductivity and magnetism is an important subject in condensed matter physics. EuFe₂As₂-based iron pnictides could offer an interesting plateau to study their relationship that has attracted considerable attention. So far, two magnetic phase transitions were observed in EuFe₂As₂-based crystal, which were deemed to originate from the itinerant Fe moments (~190 K) and the localized Eu²⁺ moments (~19 K), respectively. Here, we systematically studied the heat capacity for the EuFe₂(As<inline-formula>\u0000<tex-math><?CDATA $ _{1-x}$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:msub><mml:mrow></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad7494ieqn3.gif\"></inline-graphic></inline-formula>P_{<italic toggle=\"yes\">x</italic>})₂ crystals with <italic toggle=\"yes\">x</italic> = 0.21 (optimally doped) and <italic toggle=\"yes\">x</italic> = 0.29 (overdoped). We have found two new magnetic orders in the superconducting state (ranging from 0.4 to 1.2 K) in the optimally doped crystal. As more P was introduced into the As site, one of the magnetic orders becomes absent in the overdoped crystal. Additionally, we observed strong field and orientation dependence in heat capacity. The present findings in EuFe₂(As<inline-formula>\u0000<tex-math><?CDATA $ _{1-x}$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:msub><mml:mrow></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><inline-graphic xlink:href=\"njpad7494ieqn4.gif\"></inline-graphic></inline-formula>P_{<italic toggle=\"yes\">x</italic>})₂ have detected the new low-temperature magnetic orders, which may originate from the localized Eu²⁺ spins order or the spin reorientation.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"33 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214701","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}

{"title":"Efficient approach for generating vortex sources with arbitrary orbital angular momentum in acoustic experiments","authors":"Zhanlei Hao, Songsong Li, Yadong Xu, Shan Zhu, Huanyang Chen","doi":"10.1088/1367-2630/ad73fc","DOIUrl":"https://doi.org/10.1088/1367-2630/ad73fc","url":null,"abstract":"In theoretical research framework of acoustics or optics, how to provide stable and efficient experimental vortex sources with arbitrary orbital angular momentum (OAM) (especially with larger OAM) is a highly challenging research topic. Here, we propose and demonstrate the general principle of two different methods to generate vortex sources with arbitrary OAM, based on the point-sources array and acoustic metamaterials, respectively. Specifically, the general synthetic law is summarized from the analytical perspective behind generating two-dimensional vortex waves using different point sources with different phases, and the design flexibility of acoustic metamaterials is also utilized to provide an ideal solution for generating vortex sources with larger OAM. Besides, we qualitatively and quantitatively determine the OAM of generated vortex waves through simple formulas, and briefly discuss the applicability and stability of two different methods with complementary advantages. The principles of vortex sources generation revealed in this work provide direct theoretical support for the experimental exploration of interactions between multiphysics fields and complex media, with potential applications in vortex fields manipulation and OAM detection.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"59 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214501","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}

{"title":"Higher-order interactions and zero-determinant strategies in the public goods game","authors":"Junchi Li","doi":"10.1088/1367-2630/ad7491","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7491","url":null,"abstract":"Since the ingenious discovery of zero-determinant (ZD) strategies by Press and Dyson, many efforts have been devoted to the evolutionary performance of ZD strategies. Recently, the effects of higher-order interactions on evolutionary games have attracted widespread interests, whereas it remains unknown how higher-order interactions affect the evolutionary performance of ZD strategies. This paper focuses on the role of higher-order interactions on evolutionary ZD strategies in iterated public goods game, where the baseline payoff is a key parameter to describe nodes’ extent of reciprocity in both first-order and second-order interactions. Through the adaptive-like dynamics, we found that there is a critical value of each network, above which the networked game will converge to a consensus state where all the nodes obtain the same payoff. This critical value is significantly affected by the relative strength of higher-order interactions with a U-shaped trend. Numerical simulations are carried out to explore how the network structures affect the dynamics. The results in networks with different sizes indicate that networks with higher average degree are more easily to converge to the consensus state. The simulations on a real-world network further support the theoretical conclusions.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"20 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214702","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}