New Journal of Physics最新文献

Higher-order topological phase with subsystem symmetries 具有子系统对称性的高阶拓扑相位

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-18 DOI: 10.1088/1367-2630/ad78f9

Yizhi You

{"title":"Higher-order topological phase with subsystem symmetries","authors":"Yizhi You","doi":"10.1088/1367-2630/ad78f9","DOIUrl":"https://doi.org/10.1088/1367-2630/ad78f9","url":null,"abstract":"A wide variety of higher-order symmetry-protected topological phases (HOSPT) with gapless corners or hinges have been proposed as descendants of topological crystalline insulators protected by spatial symmetry. In this work, we address a new class of higher-order topological states that do not require crystalline symmetries but instead rely on subsystem symmetry for protection. We propose several strongly interacting models with gapless hinges or corners based on a decorated hinge-wall condensate picture. The hinge-wall, which appears as the defect configuration of a Z2 paramagnet, is decorated with a lower-dimensional SPT state. Such a unique hinge-wall decoration structure leads to gapped surfaces separated by gapless hinges. The non-trivial nature of the hinge modes can be captured by a D conformal field theory with a Wess–Zumino–Witten term. Moreover, we establish a no-go theorem to demonstrate the ungappable nature of the hinges by making a connection between the generalized Lieb–Schultz–Mattis theorem and the boundary anomaly of the HOSPT state. This universal correspondence engenders a comprehensive criterion to determine the existence of HOSPT under certain symmetries, regardless of the microscopic Hamiltonian.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257806","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

Engineering quasi-bound states in the continuum in asymmetric waveguide gratings 非对称波导光栅连续体中的工程准约束态

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-17 DOI: 10.1088/1367-2630/ad787d

Torgom Yezekyan, Sergejs Boroviks, Olivier J F Martin and Sergey I Bozhevolnyi

{"title":"Engineering quasi-bound states in the continuum in asymmetric waveguide gratings","authors":"Torgom Yezekyan, Sergejs Boroviks, Olivier J F Martin and Sergey I Bozhevolnyi","doi":"10.1088/1367-2630/ad787d","DOIUrl":"https://doi.org/10.1088/1367-2630/ad787d","url":null,"abstract":"The occurrence of quasi-bound states in the continuum (qBIC) in all-dielectric asymmetric grating waveguide couplers with different degrees of asymmetry under normal light incidence is analysed from the viewpoint of identifying the most promising configuration for realizing the highest quality (Q) factor under the condition of utmost efficiency (i.e. total extinction). Considering asymmetric gratings produced by altering every Nth ridge of a conventional (symmetric) grating coupler, we analyse different regimes corresponding to the interplay between diffractive coupling to waveguide modes and band gap effects caused by the Bragg reflection of waveguide modes. The symmetric and double- and triple-period asymmetric grating couplers are considered in detail for the same unperturbed two-mode waveguide and the grating coupler parameters that ensure the occurrence of total transmission extinction at the same wavelengths. It is found that the highest Q is expected for the double-period asymmetric grating, a feature that we explain by the circumstance that the first-order distributed Bragg resonator (DBR) is realized for this configuration while, for other configurations, the second-order DBR comes into play. Experiments conducted at telecom wavelengths for all three cases using thin-film Al2O3-on-MgF2 waveguides and Ge diffraction gratings exhibit the transmission spectra in qualitative agreement with numerical simulations. Since the occurrence of considered qBIC can be analytically predicted, the results obtained may serve as reliable guidelines for intelligent engineering of asymmetric grating waveguide couplers enabling highly resonant, linear and nonlinear, electromagnetic interactions.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257807","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

Coherent electron phase-space manipulation by combined elastic and inelastic light-electron scattering 通过弹性和非弹性光电子联合散射操纵相干电子相空间

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-15 DOI: 10.1088/1367-2630/ad7631

S T Kempers, I J M van Elk, K A H van Leeuwen and O J Luiten

{"title":"Coherent electron phase-space manipulation by combined elastic and inelastic light-electron scattering","authors":"S T Kempers, I J M van Elk, K A H van Leeuwen and O J Luiten","doi":"10.1088/1367-2630/ad7631","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7631","url":null,"abstract":"Photon-Induced Near-field Electron Microscopy (PINEM), Kapitza–Dirac (KD) gratings, and ponderomotive phase plates are examples of techniques in which the wave function of an electron in free space is manipulated using light fields: free electron quantum optics (FEQO). These effects are usually treated in separate theoretical frameworks. In this paper we present a unified, two-pronged framework that can be used to describe and numerically evaluate the performance of a number of FEQO-based electron-optical elements. The first part is a combination of existing analytical treatments of light-electron scattering, based on solving a relativistically corrected Schrödinger equation. The theoretical overview covers both second-order contributions to PINEM and the Kapitza–Dirac effect. The second, novel element of the approach is based on electron wavefront reconstruction by evaluating the quantum mechanical phase along a bundle of classical electron trajectories. The quasi-classical (but fully relativistic) approach lends itself to simulating a wide variety of FEQO devices, including the examples mentioned. We apply both approaches to a few specific experimental configurations: mirror-based first-order PINEM, second-order PINEM in very high laser intensity, and Kapitza–Dirac diffraction. The results show excellent agreement between the analytical results and the quasi-classical simulations. Finally, we propose a setup that combines KD and PINEM to allow for simultaneous coherent energy and transverse momentum shaping of an electron beam, and present simulation results thereof.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257832","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

Bipartite OTOC in open quantum systems: information scrambling and irreversibility 开放量子系统中的二方 OTOC：信息扰乱和不可逆性

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-15 DOI: 10.1088/1367-2630/ad77ee

Baibhab Bose, Devvrat Tiwari and Subhashish Banerjee

引用次数: 0

A double-edged sword: diverse interactions in hypergraphs 双刃剑：超图中的多样化互动

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-12 DOI: 10.1088/1367-2630/ad76d3

Yewei Tao, Kaipeng Hu, Pengyue Wang, Xiaoqian Zhao and Lei Shi

引用次数: 0

Generation and edge-state transitions of pseudohelical edge state based on side potentials in graphene 基于石墨烯侧势的伪螺旋边缘态的生成和边缘态转换

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-12 DOI: 10.1088/1367-2630/ad6eae

Xiao-Long Lü and Jun-Feng Liu

{"title":"Generation and edge-state transitions of pseudohelical edge state based on side potentials in graphene","authors":"Xiao-Long Lü and Jun-Feng Liu","doi":"10.1088/1367-2630/ad6eae","DOIUrl":"https://doi.org/10.1088/1367-2630/ad6eae","url":null,"abstract":"Pseudohelical edge state (PHES) was proposed based on a staggered spin–orbit coupling (SOC) uniformly applied on graphene. In this work, we investigate the formation of the PHES and its edge-state transitions by the side potentials composed of a uniform SOC, an antiferromagnetic exchange field and a staggered electric field that are applied on the boundaries in zigzag graphene nanoribbon. The results reveal that the PHESs can also be achieved by the side potential of the antisymmetric uniform spin–orbit coupling, which is attributed to the fact that the opposite (same) sign of energies at the valleys and indicates the presence (absence) of the edge state. Based on this modulated mechanism, the PHES can be further transformed into two different types of the PHESs, spin-polarized antichiral edge states (AESs) and one-sided spin-polarized AESs, by modulating the applied direction and location of the side potentials. More strikingly, by utilizing these edge-state transitions, we propose a spin dual-channel or single-channel field-effect transistor that can be operated by a staggered electric field. Moreover, we confirm that the proposed transistor is robust against disorders, with the assistance of calculating the transmission.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214689","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

On the interpretation of mean-square displacement in heterogeneous systems 关于异质系统中均方位移的解释

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-12 DOI: 10.1088/1367-2630/ad77ec

Ming-Gen Li, Rui Xing, Li-Ming Fan, Meng Hu, Jing-Dong Bao and Peng-Cheng Li

{"title":"On the interpretation of mean-square displacement in heterogeneous systems","authors":"Ming-Gen Li, Rui Xing, Li-Ming Fan, Meng Hu, Jing-Dong Bao and Peng-Cheng Li","doi":"10.1088/1367-2630/ad77ec","DOIUrl":"https://doi.org/10.1088/1367-2630/ad77ec","url":null,"abstract":"When dealing with heterogeneous systems, interpreting the mean-square displacement (MSD) data appropriately is crucial. This is due to the limitation that the various interpretations of stochastic differential equations with state-dependent diffusivity may yield the same MSD data, leading to erroneous conclusions. Aided by analytical MSD solutions supported by Langevin simulations, we explore this limitation in diffusion processes exhibiting power-law state-dependent diffusivity, , with diffusion constant D0 and scaling index µ. We find that distinct interpretations leading to same MSD data possess different D0 values. A method is introduced to discern these D0-dependent interpretations. When applying the method to subdiffusion MSD data, we observe interpretation transitions depending on the value of the anomalous diffusion coefficient. Furthermore, we demonstrate that these D0-dependent interpretations respond diversely to memory effects, which may also be used to decide on the interpretation of MSD data. We believe that these findings offer insights for interpreting MSD data in heterogeneous systems.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214688","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

Vector rogue waves in spin-1 Bose–Einstein condensates with spin–orbit coupling 具有自旋轨道耦合的自旋-1 玻色-爱因斯坦凝聚体中的矢量无赖波

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-12 DOI: 10.1088/1367-2630/ad77ed

Jun-Tao He, Hui-Jun Li, Ji Lin and Boris A Malomed

引用次数: 0

Design principles for > 90 % ... 设计原则 > 90 % ...

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-09-12 DOI: 10.1088/1367-2630/ad7635

D Dlaka, P Androvitsaneas, A Young, Q Ma, E Harbord and Ruth Oulton

引用次数: 0

Telescope imaging beyond the Rayleigh limit in extremely low SNR 望远镜成像超越极低信噪比的雷利极限

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/ad6a7d

Hyunsoo Choi, Seungman Choi, Peter Menart, Angshuman Deka and Zubin Jacob

{"title":"Telescope imaging beyond the Rayleigh limit in extremely low SNR","authors":"Hyunsoo Choi, Seungman Choi, Peter Menart, Angshuman Deka and Zubin Jacob","doi":"10.1088/1367-2630/ad6a7d","DOIUrl":"https://doi.org/10.1088/1367-2630/ad6a7d","url":null,"abstract":"The Rayleigh limit and low signal-to-noise ratio (SNR) scenarios pose significant limitations to optical imaging systems used in remote sensing, infrared thermal imaging, and space domain awareness. In this study, we introduce a stochastic sub-Rayleigh imaging (SSRI) algorithm to localize point objects and estimate their positions, brightnesses, and number in low SNR conditions, even below the Rayleigh limit. Our algorithm adopts a maximum likelihood approach and exploits the Poisson distribution of incoming photons to overcome the Rayleigh limit in low SNR conditions. In our experimental validation, which closely mirrors practical scenarios, we focus on conditions with closely spaced sources within the sub-Rayleigh limit (0.49–1.00 R) and weak signals (SNR less than 1.2). We use the Jaccard index and Jaccard efficiency as a figure of merit to quantify imaging performance in the sub-Rayleigh region. Our approach consistently outperforms established algorithms such as Richardson–Lucy and CLEAN by 4X in the low SNR, sub-Rayleigh regime. Our SSRI algorithm allows existing telescope-based optical/infrared imaging systems to overcome the extreme limit of sub-Rayleigh, low SNR source distributions, potentially impacting a wide range of fields, including passive thermal imaging, remote sensing, and space domain awareness.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142214690","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