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Coupling dynamics of topological states in an acoustic glide-dislocation lattice 声学滑移位错晶格中拓扑态的耦合动力学
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0355924
Ming-Zhu Li,Lei Shi,Jun-Xiao Zhao,Zhaojiang Chen,Ya-Xi Shen
{"title":"Coupling dynamics of topological states in an acoustic glide-dislocation lattice","authors":"Ming-Zhu Li,Lei Shi,Jun-Xiao Zhao,Zhaojiang Chen,Ya-Xi Shen","doi":"10.1063/5.0355924","DOIUrl":"https://doi.org/10.1063/5.0355924","url":null,"abstract":"We theoretically and experimentally investigate the coupling dynamics between two topological states in an acoustic glide-dislocation lattice. By mapping the lattice structure to a two-waveguide model based on coupled-mode theory, we establish a quantitative link between macroscopic coupling behaviors and microscopic geometric parameters. Then, we demonstrate topological Bloch oscillation and topological supermode propagation under single-state excitation and eigenstate-matched excitation, respectively. The topological Bloch oscillation exhibits strong robustness against structural perturbations, whereas the topological supermode propagation undergoes moderate amplitude and phase fluctuations under the same perturbations. This work lays a solid foundation for exploiting coupled topological states in acoustic wave manipulation and may inspire future applications in integrated acoustic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"36 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209030","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
The effects of CeFe2 phase distribution and magnetic transition on the magnetic behavior of hot-deformed Ce16Fe76Cu2B6 magnet CeFe2相分布和磁转变对热变形Ce16Fe76Cu2B6磁体磁性行为的影响
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0354899
Guang Yu,Bang Zhou,Shuainan Xu,Xuefeng Liao,Jingxian Xia,Hongya Yu,Zhongwu Liu
{"title":"The effects of CeFe2 phase distribution and magnetic transition on the magnetic behavior of hot-deformed Ce16Fe76Cu2B6 magnet","authors":"Guang Yu,Bang Zhou,Shuainan Xu,Xuefeng Liao,Jingxian Xia,Hongya Yu,Zhongwu Liu","doi":"10.1063/5.0354899","DOIUrl":"https://doi.org/10.1063/5.0354899","url":null,"abstract":"Tailoring the high-melting-point CeFe2 phase is an effective strategy for optimizing the magnetic performance of Ce–Fe–B permanent magnets. Further property enhancement can also be achieved by modifying the distribution, morphology, and magnetic state of the grain-boundary phases. In this study, Cu addition was employed to promote the formation of a thin network-like CeFe2 phase in hot-deformed Ce16Fe76Cu2B6 magnets. The effects of the CeFe2 magnetic transition on the magnetic properties and magnetization behavior were investigated. The results show that the saturation magnetization and maximum energy product of the magnet are significantly enhanced below 200 K. Quantitative analysis reveals that a substantial part of this enhancement is attributable to the increased magnetization and remanence due to the transformation of the CeFe2 phase from paramagnetic to ferromagnetic as the temperature decreases. Henkel plots and first-order reversal curve analyses confirm that the magnet exhibits single-phase-like behavior of magnetization and the demagnetization process is dominated by the Ce2Fe14B phase, indicating well exchange coupled soft magnetic CeFe2 phase and hard magnetic Ce2Fe14B phase at the temperature below 200 K. The average interaction field effectively suppresses premature demagnetization of CeFe2 and ensures stable magnetic coupling. This work can help to understand the effects of CeFe2 phase distribution and magnetism on the performance of Ce–Fe–B based permanent magnets.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"36 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208980","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
Origin of mechanical strain and its spatial uniformity enhancement from recessed silicon nitride sidewall stressor 嵌入式氮化硅侧壁应力源的力学应变来源及其空间均匀性增强
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0354968
Yiding Lin,Kwang Hong Lee,Rui-Tao Wen,Jurgen Michel,Chuan Seng Tan
{"title":"Origin of mechanical strain and its spatial uniformity enhancement from recessed silicon nitride sidewall stressor","authors":"Yiding Lin,Kwang Hong Lee,Rui-Tao Wen,Jurgen Michel,Chuan Seng Tan","doi":"10.1063/5.0354968","DOIUrl":"https://doi.org/10.1063/5.0354968","url":null,"abstract":"Wavelength bandwidth is a key performance metric for emerging optical interconnects targeting high-data-rate communications. Strain engineering has proven effective in tailoring the wavelength bandwidth of Ge photonic devices. Although a recessed SiN sidewall stressor was found to extend the absorption edge of Ge photodetectors (PDs) into the L-band with a responsivity improvement of >3×, the working mechanism of the recessed stressor remains poorly understood. Here, we attribute the strain enhancement and its spatial uniformity improvement in Ge PDs to the removal of the compressive strain at the bottom edge corners of the Ge strip. PDs employing the stressors exhibit electrical responses consistent with the mechanism. These findings offer a general framework for applying recessed SiN sidewall stressors to semiconductor photonic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208983","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
Is Bi(110) on Ge(111) topological or trivial? Ge（111）上的Bi（110）是拓扑的还是平凡的？
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0358658
Kevin Vonk,Remon te Brake,Ying Wang,Harold J. W. Zandvliet
{"title":"Is Bi(110) on Ge(111) topological or trivial?","authors":"Kevin Vonk,Remon te Brake,Ying Wang,Harold J. W. Zandvliet","doi":"10.1063/5.0358658","DOIUrl":"https://doi.org/10.1063/5.0358658","url":null,"abstract":"In the realm of topological materials, bismuth is regarded as one of the prime candidates owing to its large spin–orbit coupling. Recent studies have revealed that the rectangular Bi(110) phase may host topological edge or higher-order topological hinge states. The topological nature of Bi(110) depends critically on the buckling of the (110) lattice. Only buckling below 0.1 Å may yield topologically non-trivial states. In this work, we examine the Bi(110) phase grown on Ge(111) using scanning tunneling microscopy and spectroscopy. The Bi(110) islands grow in four sets of threefold high-symmetry directions, which are rotated by ±13.7° and ±16.3° with respect to the high-symmetry directions of the (3×3)R30° Bi wetting layer covering the Ge(111) surface, revealing that the diagonals of the Bi(110) and Bi wetting layer unit cells align. Multilayer Bi(110) islands show a large buckling and an increased density of states at step edges near −0.35 eV. We find this state to emerge from the Bi wetting layer surface rather than the edge itself. The buckling of bilayer Bi(110) islands is lower and lies on the cusp of the trivial to topological transition. However, we find no evidence of electronic enhancement at its edges or corners.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208986","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
Monolithic chalcogenide-on-silicon platform for passive and active integrated photonic devices at the 2 μ m waveband 用于2 μ m波段无源和有源集成光子器件的单片硫族硅平台
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0354287
Seyyed Moinalden Mostaan,Shuo Lin,Hui Ma,Zezhao Ju,Lan Li,Hongtao Lin
{"title":"Monolithic chalcogenide-on-silicon platform for passive and active integrated photonic devices at the 2\u0000 \u0000 μ\u0000 \u0000 m waveband","authors":"Seyyed Moinalden Mostaan,Shuo Lin,Hui Ma,Zezhao Ju,Lan Li,Hongtao Lin","doi":"10.1063/5.0354287","DOIUrl":"https://doi.org/10.1063/5.0354287","url":null,"abstract":"Extending silicon photonic integrated circuits toward the 2 μm and longer mid-infrared spectral ranges requires photonic platforms that simultaneously provide strong optical confinement, fabrication tolerance, and active-device compatibility. Here, we demonstrate a monolithic chalcogenide-on-silicon strip-loaded platform that integrates a 400-nm-thick Ge25Sb10Se65 layer on a standard 220-nm silicon-on-insulator substrate. The chalcogenide overlayer enhances mode confinement at extended wavelengths while retaining the underlying silicon layer intact for carrier-injection-based modulation. Using this platform, we demonstrate grating couplers with a coupling loss of −4.98 dB and one-dimensional photonic crystal nanobeam resonators with loaded quality factors exceeding 2.6 × 104 near the 2 μm band. Active device is further realized by integrating the chalcogenide strip-loaded waveguide with a PIN-doped silicon layer, where carrier injection induces refractive-index change in silicon. The modulator achieves a DC extinction ratio of 7.61 dB with a 400 mV voltage swing and an average switching time of 3.98 ns. These results demonstrate that monolithic chalcogenide-on-SOI integration can combine fabrication-tolerant passive photonic structures with silicon-based active modulation, offering a scalable route toward extended-wavelength and mid-infrared integrated photonics.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"7 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209029","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
Zero-shot physics-supervised neural network for data-free photoacoustic tomography reconstruction 无数据光声层析重建的零射击物理监督神经网络
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0353516
Qi Liu,Shengyu Fang,Ziqian Feng,Hengrong Lan,Fei Gao,Siyu Liu
{"title":"Zero-shot physics-supervised neural network for data-free photoacoustic tomography reconstruction","authors":"Qi Liu,Shengyu Fang,Ziqian Feng,Hengrong Lan,Fei Gao,Siyu Liu","doi":"10.1063/5.0353516","DOIUrl":"https://doi.org/10.1063/5.0353516","url":null,"abstract":"To address the ill-posedness inherent in photoacoustic tomography reconstruction, we propose ZS-PSNN, a zero-shot physics-supervised neural network framework that eliminates the reliance on external paired training data. By explicitly constructing a discretized acoustic system matrix and embedding it as a differentiable forward operator within the loss function, the proposed method enforces acoustic measurement consistency to supervise the neural network optimization directly from a single scan. Results on simulated vascular data and experimental mouse data demonstrate that ZS-PSNN achieves competitive reconstruction performance compared with FBP, TR, model-based TV regularization, plug-and-play TV, and implicit neural representation methods. This work establishes a single-measurement physics-supervised neural optimization strategy for zero-shot photoacoustic reconstruction applicable to scenarios where high-quality paired training data are challenging to obtain.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"24 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210352","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
Metasurface-based optical Radon transform for complex-amplitude reconstruction 基于超表面的复幅重建光学Radon变换
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0360122
Xinyue Wang,Chenxuan Xiang,Bin Huang,Shuyuan Xiao,Qiegen Liu
{"title":"Metasurface-based optical Radon transform for complex-amplitude reconstruction","authors":"Xinyue Wang,Chenxuan Xiang,Bin Huang,Shuyuan Xiao,Qiegen Liu","doi":"10.1063/5.0360122","DOIUrl":"https://doi.org/10.1063/5.0360122","url":null,"abstract":"Radon transform is a fundamental mathematical operation in tomography, and its conventional implementation usually relies on digital computation or bulky optical systems. Metasurface provides a new route for compact optical Radon transform. However, existing approaches based on metasurface remain largely limited to amplitude-only imaging and dense projection sampling. In this Letter, we propose an optical Radon transform system for complex-amplitude imaging, in which a wavelet-guided diffusion transformer is further employed to simultaneously recover amplitude and phase information. We also investigate sparse-view sampling to reduce the number of projection measurements and evaluate the robustness of the proposed framework under challenging projection conditions. Our work extends optical Radon imaging from single-channel to multi-channel imaging while reducing the complexity of data acquisition.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"15 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208702","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
Monatomic nitrogen diffusion in β-Ga2O3 单原子氮在β-Ga2O3中的扩散
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0347361
N. H. Nickel,J. Rappich
{"title":"Monatomic nitrogen diffusion in β-Ga2O3","authors":"N. H. Nickel,J. Rappich","doi":"10.1063/5.0347361","DOIUrl":"https://doi.org/10.1063/5.0347361","url":null,"abstract":"The migration of nitrogen is examined in β−Ga2O3 to determine if diffusion is governed by molecular or monatomic diffusion. Special samples are grown by pulsed laser deposition where the isotopes 14N and 15N are spatially separated. This is verified by secondary-ion-mass spectrometry measurements. Insight into the migration process is obtained from gas effusion. The experimental data provide clear evidence for monatomic nitrogen diffusion in β−Ga2O3.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208704","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
Multi-phonon absorptions of the nonlinear optical barium borate crystal 非线性光学硼酸钡晶体的多声子吸收
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0322610
Rukang Li,Bo Xu,Feidi Fan,Guochun Zhang
{"title":"Multi-phonon absorptions of the nonlinear optical barium borate crystal","authors":"Rukang Li,Bo Xu,Feidi Fan,Guochun Zhang","doi":"10.1063/5.0322610","DOIUrl":"https://doi.org/10.1063/5.0322610","url":null,"abstract":"The nonlinear optical crystal barium borate (BBO) is known to have an IR transmission cutoff of 3.3 μm and multiple absorption peaks starting from 2.1 μm to the cutoff. Despite laser output with wavelength as long as 2.7 μm being achieved in BBO, the absorption mechanisms seem not to have been well understood. By a joint theoretical and experimental investigation, we uncover that the absorptions from 2.1 to 3.3 μm are due to the 3-phonon absorptions of the ordinary (o) ray, while those from 3.3 to 6 μm originate from 2-phonon absorptions of the o-ray. In contrast, BBO is highly transparent up to about 5 μm for the extraordinary (e) ray with weaker 2-phonon absorptions above that. The new understanding may help to extend the useful mid-IR band by exploitation of the wide transparency range of e-ray for BBO in laser generation or detection of short pulses.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"37 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209023","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
Ultrasound real-time imaging of crack propagation during ultrasonic fatigue tests 超声疲劳试验中裂纹扩展的超声实时成像
IF 4 2区 物理与天体物理
Applied Physics Letters Pub Date : 2026-10-12 DOI: 10.1063/5.0347304
R. Delalande,M. Ducousso,E. Monteiro,N. Ranc
{"title":"Ultrasound real-time imaging of crack propagation during ultrasonic fatigue tests","authors":"R. Delalande,M. Ducousso,E. Monteiro,N. Ranc","doi":"10.1063/5.0347304","DOIUrl":"https://doi.org/10.1063/5.0347304","url":null,"abstract":"This Letter describes a real-time surface inspection method based on ultrasonic synthetic imaging using Rayleigh waves. The proposed method can be employed to monitor crack propagation during ultrasonic fatigue tests. The setup, which is highly sensitive to cracks, enables the imaging of a large surface (tens of mm2), with spatial resolutions of several tens of micrometers and an imaging frequency of up to 50 frames per second. The micrometric resolution allows cracks to be investigated at the grain level, while the sample imaging enables high-velocity crack propagation to be accurately resolved. These two domains have rarely been investigated to date because of experimental limitations. This work paves the way for a new type of laboratory-scale fatigue monitoring based on crack propagation, leading to better comprehension of the associated physical phenomena.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149208977","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
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