物理与天体物理最新文献_第2页

Secondary Flows and Hydraulic Resistance in a Rectangular Channel with Spatially Inhomogeneous Discrete Roughness

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026700926

R. R. Shakirov, I. A. Davletshin, N. I. Mikheev

{"title":"Secondary Flows and Hydraulic Resistance in a Rectangular Channel with Spatially Inhomogeneous Discrete Roughness","authors":"R. R. Shakirov, I. A. Davletshin, N. I. Mikheev","doi":"10.1134/S1063785026700926","DOIUrl":"10.1134/S1063785026700926","url":null,"abstract":"Spanwise heterogeneous surface roughness can induce secondary flows of Prandtl’s second kind, which significantly affect momentum and heat transfer. Despite a large number of numerical studies of such flows, experimental data remain rather limited. In this paper, an experimental study of turbulent flow in a rectangular channel with walls formed by alternating smooth sections and strips of discrete roughness is performed. The fields of mean velocities and turbulence characteristics are obtained using the SIV method, and the structure of secondary flows is reconstructed. Measurements of hydraulic resistance are carried out for various surface configurations and Reynolds numbers. It is shown that heterogeneous roughness leads to the formation of large-scale secondary flows in the form of counter-rotating vortices with a transverse velocity of up to 5% of the main flow velocity. A correlation between the intensity of secondary flows and the hydraulic resistance coefficient is revealed, indicating a significant role of secondary circulation in momentum transfer mechanisms in the channel.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"476 - 483"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Broadband Optical Characterization of Tetragonal Barium Titanate by Mueller-Matrix Spectroscopic Ellipsometry 方形钛酸钡的米勒矩阵椭圆偏振光谱宽带光学表征

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2026-10-20 DOI: 10.1021/acsphotonics.6c01514

Jiwon Kang,Nina Hong,Christopher M. Yi,Yun Su Go,Martin Thomaschewski,Hwi Je Woo,Prachi Thureja,Junghoon Jahng,Harry A. Atwater,Min Seok Jang

{"title":"Broadband Optical Characterization of Tetragonal Barium Titanate by Mueller-Matrix Spectroscopic Ellipsometry","authors":"Jiwon Kang,Nina Hong,Christopher M. Yi,Yun Su Go,Martin Thomaschewski,Hwi Je Woo,Prachi Thureja,Junghoon Jahng,Harry A. Atwater,Min Seok Jang","doi":"10.1021/acsphotonics.6c01514","DOIUrl":"https://doi.org/10.1021/acsphotonics.6c01514","url":null,"abstract":"Barium titanate (BTO), one of the earliest reported ferroelectric materials, exhibits strong second-order nonlinearity and an ultrafast Pockels effect, making it highly attractive for photonics. However, its optical constants remain uncertain largely due to the ubiquitous ferroelectric–ferroelastic multidomain microstructure, which depolarizes and averages out the anisotropic optical response, thereby complicating conventional ellipsometric approaches. Here, we report a Kramers–Kronig-consistent complex refractive-index tensor of tetragonal BTO from the ultraviolet (190 nm) to the far-infrared (40 μm) derived from multimodal Mueller-matrix spectroscopic ellipsometry. We further quantify optical loss by incorporating transmission intensity measured over the 2–10 μm transparency window, resolving the extinction coefficient down to ∼10–5. To verify the underlying domain configuration, we performed independent structural analyses, including electron backscatter diffraction, confocal Raman microscopy, and Kelvin probe force microscopy. We then reconstruct an effective optical model for our multidomain BTO sample, formulated as a mixture of three tetragonal variants with the determined intrinsic refractive indices, to link microscopic domains to the macroscopic optical response. Our work presents a unified, experimentally cross-validated data set, enabling accurate modeling for electro-optic modulators and high-Q nanophotonic resonators without ad hoc approximations, and provides a general strategy for optical metrology of complex ferroic crystals.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"56 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Asymptotically good bosonic Fock state codes 渐近良好玻色子Fock态码

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2026-10-20 DOI: 10.22331/q-2026-10-20-2240

Dor Elimelech, Arda Aydin, Alexander Barg

{"title":"Asymptotically good bosonic Fock state codes","authors":"Dor Elimelech, Arda Aydin, Alexander Barg","doi":"10.22331/q-2026-10-20-2240","DOIUrl":"https://doi.org/10.22331/q-2026-10-20-2240","url":null,"abstract":"We study the error-correction properties of multi-mode Fock-state codes under amplitude-damping (AD) noise, focusing on the asymptotic regime in which the total excitation of the code states grows without limit and the number of photon losses induced by the noise scales linearly with it. In this setting, existing code families, which correct only sublinearly many photon losses, do not protect against amplitude-damping (AD) noise with a constant loss parameter. As our main result, we address this gap by constructing asymptotically good Fock-state codes relying on random classical codes in the discrete simplex. Unlike many standard constructions of random quantum codes, our construction introduces randomness through the underlying classical indexing structure. Randomization also enables another desirable feature: bounded per-mode occupancy, which limits the number of photons in any individual mode and thereby increases the coherence lifetime of the code states. Finally, via a relation between Fock-state codes and permutation-invariant codes, our results also yield asymptotically good families of qudit permutation-invariant codes as well as codes in monolithic nuclear state spaces.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"46 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221410","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

Monte Carlo Analysis of Ga2O3 Damage from Alpha Particle Radiation

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600626

Daotian Shi, Chuanyang Liu, Qing Sun, Jingjing Liu, Xinjiang Wang, Huakui Hu

{"title":"Monte Carlo Analysis of Ga2O3 Damage from Alpha Particle Radiation","authors":"Daotian Shi, Chuanyang Liu, Qing Sun, Jingjing Liu, Xinjiang Wang, Huakui Hu","doi":"10.1134/S1063785026600626","DOIUrl":"10.1134/S1063785026600626","url":null,"abstract":"In this study, we used the Monte Carlo method to simulate the interaction of alpha particles with Ga2O3 and assess radiation damage. The findings show that alpha particles are primarily stopped by electrons, with ionization dominating energy dissipation, while phonon and vacancy‑related losses contribute negligibly. Over the investigated energy range, ionization loss increased with radiation energy, while both phonon and vacancy losses decreased. At a radiation energy of 2.05 MeV, ionization accounts for 99.41% of the total energy loss, while phonon excitation and vacancy formation contribute only 0.03 and 0.52%, respectively. As the radiation energy increased from 2.05 to 5.48 MeV, the peak energy absorbed by Ga and O atoms decreased from 0.81 and 0.84 eV to 0.62 eV, respectively. Alpha particles in Ga2O3 have a spatial distribution similar to a tadpole. The calculated maximum values were 0.0347 for displacement per atom (DPA), 1.63 × 1021 cm–3 for VGa concentration, and 1.65 × 1021 cm–3 for VO concentration. These results demonstrate that alpha particle irradiation causes substantial damage in Ga2O3, posing a critical threat to both material integrity and device functionality.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"493 - 500"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Theoretical Estimation of the Heat Transfer Coefficient in a Plane Channel

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S106378502670094X

N. D. Bogdanov, I. A. Davletshin

引用次数: 0

Monolithically Integrated Deep Ultraviolet Emitters With Electrode‐Engineered Light Polarization 具有电极工程光偏振的单片集成深紫外发射器

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2026-10-20 DOI: 10.1002/lpor.72082

Yang Kang, Junxing Qiu, Muhammad Hunain Memon, Huabin Yu, Yuchen Du, Siyuan Li, Yiguo Yan, Zhixiang Gao, Zeyu Tang, Sheng Liu, Haiding Sun

{"title":"Monolithically Integrated Deep Ultraviolet Emitters With Electrode‐Engineered Light Polarization","authors":"Yang Kang, Junxing Qiu, Muhammad Hunain Memon, Huabin Yu, Yuchen Du, Siyuan Li, Yiguo Yan, Zhixiang Gao, Zeyu Tang, Sheng Liu, Haiding Sun","doi":"10.1002/lpor.72082","DOIUrl":"https://doi.org/10.1002/lpor.72082","url":null,"abstract":"Implementing light polarization control has enabled the realization of numerous fascinating optical phenomena and functionalities in both scientific and industrial applications. However, achieving precise and deterministic manipulation of light polarization in shorter wavelength, e.g., deep ultraviolet (DUV) band (λ < 280 nm) remains challenging. Herein, we demonstrate, for the first time, electrode‐engineered polarization control of DUV emission directly from a light emitter, without involving bulky external optics or complex metasurface or plasmonic architectures. Simply by strategically engineering the p‐type electrode geometry from circular, micro‐ring to narrow‐ring configurations, the relative contributions of transverse‐magnetic (TM) and transverse‐electric (TE) emission can be systematically controlled, yielding well‐separated TM to TE intensity ratios of 0.36, 0.54, and 0.77, respectively. Strikingly, their −3 dB bandwidths are 261, 298, and 300 MHz, respectively, with corresponding high‐speed data rates of 2.49, 2.63, and 2.87 Gbps can be achieved. Building upon this controllable polarization and modulation landscape, we further demonstrate polarization‐assisted multiplexing and physical‐layer secure optical communication by leveraging device‐specific polarization states as intrinsic optical fingerprints. These results establish a feasible and scalable approach toward the direct control over the DUV‐light polarization for high‐speed and secure ultraviolet photonic systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Unified Topological Dynamics of Merging Bound States in the Continuum for High‐Order Topological Charges 高阶拓扑电荷连续统中合并束缚态的统一拓扑动力学

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2026-10-20 DOI: 10.1002/lpor.72088

Keren Wang, Lujun Huang, Wei Wang

{"title":"Unified Topological Dynamics of Merging Bound States in the Continuum for High‐Order Topological Charges","authors":"Keren Wang, Lujun Huang, Wei Wang","doi":"10.1002/lpor.72088","DOIUrl":"https://doi.org/10.1002/lpor.72088","url":null,"abstract":"Bound states in the continuum (BICs) are polarization singularities in momentum space whose topological charges (TCs) govern advanced light‐matter interactions. While lattice symmetry protects the existence of robust BICs at the Γ‐point (SP‐BICs), it also restricts their TCs to low‐order values. Achieving high‐order TCs in common crystal lattices, such as ‐symmetric systems, has therefore remained an open question. Here, we systematically demonstrate that high‐order TCs that surpass fundamental symmetry bounds can be created through the rich dynamics of a parameter‐driven merging process of off‐Γ BICs. We introduce a unified geometric framework based on the interplay between Fabry–Pérot interference and guided resonances, which uncovers different types of merging BICs dynamics, including near‐isotropic, anisotropic, and cross‐merging. Leveraging this mechanism, we realize unconventional TCs of up to at either a symmetry‐protected BIC or a degeneracy point in a simple ‐symmetric photonic crystal slab. We further show that this high‐order topology enables the generation of high‐quality Bessel OAM beams, providing a physically transparent route toward engineering high‐order topological photonics.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"497 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 Formation of Majorana Zero Modes in Chiral Carbon Nanotubes under the Influence of Geometric Factors

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600535

I. Erazo Velasco, D. A. Kuzmin

{"title":"The Formation of Majorana Zero Modes in Chiral Carbon Nanotubes under the Influence of Geometric Factors","authors":"I. Erazo Velasco, D. A. Kuzmin","doi":"10.1134/S1063785026600535","DOIUrl":"10.1134/S1063785026600535","url":null,"abstract":"In this paper, we investigate the occurrence of Majorana zero modes in carbon nanotubes in contact with a conventional superconductor and placed in a longitudinal magnetic field. The influence of nanotube geometry, determined by chirality indices ((n,m)), on the conditions for the formation of the topological superconducting phase is considered. It is shown that chirality changes the electronic structure of the nanotube, the spin–orbit interaction and the effective chemical potential, which determine the conditions of the topological phase transition. To describe the system, an effective model based on the Bogolyubov–de Gennes Hamiltonian is constructed, which allows one to obtain a criterion for the occurrence of Majorana null modes. Based on the developed model, a method for selecting the most favorable geometries of carbon nanotubes is proposed. Numerical results show that certain chiralities minimize the effective chemical potential and facilitate the transition of the system to the topological phase. The obtained results show that the geometry of the carbon nanotube is an effective parameter for controlling the topological properties of the system and can serve as a criterion for choosing the chiralities that are most promising for the experimental implementation of Majorana zero modes.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"507 - 520"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Issue of Calculating Actuator Rod Stability When Regulating the Performance of a Piston Compressor

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600596

R. E. Kobyl’skiy

引用次数: 0

Reliable Entropy Estimation from Observed Statistics for Device-Independent Quantum Cryptography 基于观测统计量的可靠熵估计与设备无关的量子密码

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2026-10-20 DOI: 10.22331/q-2026-10-20-2238

引用次数: 0