JETP Letters最新文献_第5页

Lateral Current Supply Scheme for Spin-Trigger Josephson Valves 自旋触发约瑟夫森阀的横向电流供应方案

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026606846

A. A. Neilo, V. I. Ruzhitskiy, N. V. Klenov, I. I. Soloviev, Z. Wang, M. Yu. Kupriyanov, S. V. Bakurskiy

{"title":"Lateral Current Supply Scheme for Spin-Trigger Josephson Valves","authors":"A. A. Neilo, V. I. Ruzhitskiy, N. V. Klenov, I. I. Soloviev, Z. Wang, M. Yu. Kupriyanov, S. V. Bakurskiy","doi":"10.1134/S0021364026606846","DOIUrl":"10.1134/S0021364026606846","url":null,"abstract":"Current transport in an SF1S1F2sIS Josephson junction, where one of the superconducting (S) electrodes is implemented as a spin valve (SF1S1F2s) and I is the tunnel insulating barrier, has been studied. In such a valve, the state of the thin s layer is controlled by changing the relative orientation of the magnetization vectors of the ferromagnetic layers F1 and F2. The dependences of the critical current density Jc on the temperature, as well as on the thicknesses of the ferromagnetic and superconducting layers, are calculated for two experimentally relevant current supply scenarios: through the outer S electrode and through the thin s film of the spin valve. It has been shown that the current supply through the s film provides higher absolute values of Jc and preserves the sign of the first harmonic of the current–phase dependence even in the 0–π transition mode of the magnetic subsystem. The obtained results specify the applicability limits of simplified models of direct current flow and formulate practical criteria for interpreting experiments and designing planar Josephson spin valves.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 1","pages":"65 - 72"},"PeriodicalIF":1.1,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026606846.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of Grating Disorder in Resonant Smith–Purcell Radiation 光栅无序在共振Smith-Purcell辐射中的作用

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026601296

D. Yu. Sergeeva, A. A. Tishchenko

{"title":"Role of Grating Disorder in Resonant Smith–Purcell Radiation","authors":"D. Yu. Sergeeva, A. A. Tishchenko","doi":"10.1134/S0021364026601296","DOIUrl":"10.1134/S0021364026601296","url":null,"abstract":"Smith–Purcell radiation from metasurfaces is becoming an increasingly popular object for theoretical and experimental study. Gratings consisting of resonant elements are the most attractive target in this area, as they emit enhanced radiation. Despite the rapid progress in nanotechnology, statistical errors arise during the manufacturing of metasurfaces and can lead to significant changes in radiation properties. In this work, we theoretically analyze the resonant Smith–Purcell radiation from a disordered array of dimers of interacting sub-wavelength particles. Two sources of statistical errors are considered: disorder in the period of the grating and misalignment of particles within each dimer. We show that the spectral characteristics of the Smith–Purcell radiation strongly depend on the ratio of the Smith–Purcell radiation harmonic and resonant frequencies. The disorder can lead to a shift in the frequency at which the most intense radiation is emitted, depending on which process dominates – the coherent one or the resonant one. In general, our results show that resonant Smith–Purcell radiation, when resonant frequency of close to one of the Smith–Purcell radiation harmonics, is much more robust than conventional Smith–Purcell radiation. Our theory helps to estimate the accuracy with which it is necessary to produce gratings for purposes of photonics and nanoelectronics, and is also important for designing and interpreting the experiments on Smith–Purcell radiation from 2D flat structures, including metasurfaces, flat photonic and plasmonic crystals, which are actively studied in optics today.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 1","pages":"7 - 14"},"PeriodicalIF":1.1,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807415","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

Magnetophonon Resonance in n-InGaAs Ternary Quantum Well Compounds n-InGaAs三元量子阱化合物中的磁声子共振

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026607037

I. L. Drichko, I. Yu. Smirnov, M. O. Safonchik, M. A. Shakhov, M. Yu. Chernov, V. A. Solov’ev, S. V. Gudina, A. N. Vinichenko, A. Yu. Maslov

引用次数: 0

Optical Spectroscopy and Measurement of Ion Heating Rates in a Planar Trap 光谱学和平面阱中离子加热速率的测量

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026607177

I. S. Gerasin, A. M. Russkikh, N. O. Zhadnov, K. S. Kudeyarov, I. V. Sherstov, I. A. Semerikov, N. N. Kolachevsky

引用次数: 0

Spectral–Angular Distributions of X-Ray Twisted Photons Emitted by Relativistic Electrons During Axial Channeling 相对论电子在轴向通道中发射的x射线扭曲光子的光谱角分布

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026606822

K. B. Korotchenko, Yu. P. Kunashenko

引用次数: 0

On the 169Tm NMR Line Shape and Local-Field Distribution in Dilute LiY0.98Tm0.02F4: Monte Carlo Analysis 稀LiY0.98Tm0.02F4中169Tm核磁共振谱线形状和局域场分布的蒙特卡罗分析

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-11 DOI: 10.1134/S0021364026607347

A. G. Kiiamov

{"title":"On the 169Tm NMR Line Shape and Local-Field Distribution in Dilute LiY0.98Tm0.02F4: Monte Carlo Analysis","authors":"A. G. Kiiamov","doi":"10.1134/S0021364026607347","DOIUrl":"10.1134/S0021364026607347","url":null,"abstract":"A microscopic Monte Carlo analysis of the 169Tm NMR line shape in dilute LiY0.98Tm0.02F4 is presented. The random occupation of rare-earth lattice sites by Tm3+ ions is treated explicitly, and the distribution of dipolar local fields at the resonant 169Tm nuclei is calculated for (5 times {{10}^{6}}) independent configurations. It is shown that, in the 2% diluted system, the nuclear magnetic resonance spectrum is strongly non-Gaussian. Instead of a single smooth line, the calculated profile consists of a dominant central resonance produced by relatively isolated thulium ions and weak satellite components arising from rare close Tm–Tm configurations. This discreteness strongly affects the interpretation of the anomalously large linewidth reported for ({{{mathbf{H}}}_{0}}parallel [001]). In particular, the global second moment is found to be highly sensitive to the far wings of the distribution and therefore does not characterize the intrinsic width of the main spin ensemble. The full width at half maximum of the central peak provides a more physically transparent measure of the linewidth in the dilute limit. The calculated angular dependence reproduces the strong anisotropy associated with the van Vleck response of Tm3+ ions and supports a microscopic reinterpretation of the observed broadening in terms of conventional dipolar local fields in a spatially disordered rare-earth sublattice.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"265 - 270"},"PeriodicalIF":1.1,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098827","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

Bound States of a Lattice Composite Boson on a “Magnetic” Impurity 磁性杂质上晶格复合玻色子的束缚态

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-11 DOI: 10.1134/S0021364026607657

L. I. Knyazeva, V. I. Yudson

引用次数: 0

Perfect Absorption by Metal-Contacted Two-Dimensional Systems with Ultra-Proximate Reflectors 具有超近反射器的金属接触二维系统的完美吸收

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-08-11 DOI: 10.1134/S0021364026607049

K. Kapralov, V. Atlasov, A. Khisameeva, V. Muravev, D. Svintsov

{"title":"Perfect Absorption by Metal-Contacted Two-Dimensional Systems with Ultra-Proximate Reflectors","authors":"K. Kapralov, V. Atlasov, A. Khisameeva, V. Muravev, D. Svintsov","doi":"10.1134/S0021364026607049","DOIUrl":"10.1134/S0021364026607049","url":null,"abstract":"Electromagnetic absorbance by most two-dimensional electron systems is typically well below unity, which hinders both practical applications in photodetection and fundamental studies of their optical properties. Here, we show that a periodic structure comprised of narrow two-dimensional sections connected with wide perfectly conducting metal sections enables large absorbance. It reaches 50% provided the filling factor by the two-dimensional system f equals its dimensionless conductivity (eta = sigma {{Z}_{0}}{text{/}}2), where ({{Z}_{0}}) is the free-space impedance. The absorbance is further raised to 100% if the periodic structure is placed above a perfectly conducting electromagnetic reflector, and provided (f = 2eta ). Surprisingly, the optimal distance between two‑dimensional system and reflector may fall well below the quarter of incident wavelength ({{lambda }_{0}}{text{/}}4), which was assumed as conventional absorption enhancement condition in optics. For low filling factors (f ll 1), large dielectric constants of the substrate, and grating periods comparable with ({{lambda }_{0}}), the optimal distance to reflector tends to zero. Above the critical values of the grating geometrical parameters, the absorbance maximum ceases to exist. The critical behavior manifests as a large-amplitude resonance in “dirty” two-dimensional system with purely real conductivity, while enhancement of carrier momentum relaxation time lowers the resonant peak. Such resonance mimics the plasmonic one, but does not rely on high electron mobility.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"271 - 280"},"PeriodicalIF":1.1,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607049.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of a Supercritical CO2 Microstructure on Clustering in the Process of Expansion into a Vacuum 超临界CO2微观结构对真空膨胀过程中聚类的影响

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601090

T. A. Semenov, G. V. Mishakov, A. V. Lazarev, E. O. Epifanov, N. V. Minaev, E. I. Mareev

{"title":"Effect of a Supercritical CO2 Microstructure on Clustering in the Process of Expansion into a Vacuum","authors":"T. A. Semenov, G. V. Mishakov, A. V. Lazarev, E. O. Epifanov, N. V. Minaev, E. I. Mareev","doi":"10.1134/S0021364026601090","DOIUrl":"10.1134/S0021364026601090","url":null,"abstract":"The influence of the initial microstructure of supercritical carbon dioxide (scCO2) in the steady state in the process of its clustering during rapid expansion into a vacuum has been demonstrated. The molecular dynamics simulation has shown the presence of aggregates in the initial medium (P0 = 80–200 bar, T0 = 310–330 K) with a size distribution described by a bimodal lognormal function. One of the distribution modes corresponds to “large” aggregates with a diameter of 15–30 nm, characteristic of the Widom delta (a region on the phase diagram near the critical point). Mie scattering diagnostic has been used to establish the relationship between the fluid microstructure in a supercritical reactor and clustering in the process of expansion of a CO2 jet into a vacuum. It has been experimentally shown that the cluster size distribution in the expanding jet is also described by a bimodal lognormal function with a mode of large clusters of 50–80 nm in size. It has been found that the concentration of large clusters in the jet changes linearly with the concentration of large aggregates for the Widom delta.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"843 - 850"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615039","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

Correlations of Optical Wave Phase Gradients in a Stratified Turbulent Atmosphere 层状湍流大气中光波相位梯度的相关性

IF 1.1 4区物理与天体物理

JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601570

A. V. Nemtseva, F. A. Starikov

引用次数: 0