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Amorphous Porous Water Structures for Hydrogen Storage 用于储氢的非晶多孔水结构
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364025608772
R. K. Zhdanov, K. V. Gets, Yu. Yu. Bozhko, V. R. Belosludov
{"title":"Amorphous Porous Water Structures for Hydrogen Storage","authors":"R. K. Zhdanov,&nbsp;K. V. Gets,&nbsp;Yu. Yu. Bozhko,&nbsp;V. R. Belosludov","doi":"10.1134/S0021364025608772","DOIUrl":"10.1134/S0021364025608772","url":null,"abstract":"<p>Amorphous porous water structures containing up to 80 g/L or 9.73 wt % hydrogen, which exceeds the content in clathrate hydrates, have been obtained for the first time using the molecular dynamics method. A study of the behavior of the obtained systems at various temperatures and a pressure of 5 bar has shown the possibility of their stabilization, and the region of existence of these structures depending on the composition has been assessed. The analysis has shown the formation of a dynamically stable sparse network of hydrogen bonds of water molecules, the voids of which are filled with hydrogen molecules whose diffusion coefficient may be lower than that in the hydrate.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"103 - 109"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025608772.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148854721","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
Local Quench Within the Keldysh Technique: the Role of Interaction Keldysh技术中的局部淬火：相互作用的作用
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S002136402660062X
D. V. Lopatin, A. A. Radovskaya, A. G. Semenov
{"title":"Local Quench Within the Keldysh Technique: the Role of Interaction","authors":"D. V. Lopatin,&nbsp;A. A. Radovskaya,&nbsp;A. G. Semenov","doi":"10.1134/S002136402660062X","DOIUrl":"10.1134/S002136402660062X","url":null,"abstract":"<p>This work introduces a novel approach that makes it possible to take interaction into account in the problem of the evolution of a quantum field after an instantaneous local perturbation (quench). Using scalar theory <span>(g{{varphi }^{4}})</span> as an example, we demonstrate a method for describing the influence of interaction on the field dynamics after a quench within the semiclassical approximation in the Keldysh technique. The proposed approach is nonperturbative in the coupling constant, valid for arbitrary initial conditions, and well suited for numerical computation. As an illustration, we show how the interaction drives thermalization toward a new stationary state of the system and leads to a loss of coherence, which manifests itself in the destruction of the interference pattern that is characteristic of the noninteracting case.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"138 - 145"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402660062X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856644","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
Magnetic States of a Finite-Length Mn Chain on a Pt(332) Surface in an External Magnetic Field 外磁场作用下Pt（332）表面有限长度Mn链的磁态
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026606871
S. V. Kolesnikov, E. S. Glazova, A. M. Saletsky
{"title":"Magnetic States of a Finite-Length Mn Chain on a Pt(332) Surface in an External Magnetic Field","authors":"S. V. Kolesnikov,&nbsp;E. S. Glazova,&nbsp;A. M. Saletsky","doi":"10.1134/S0021364026606871","DOIUrl":"10.1134/S0021364026606871","url":null,"abstract":"<p>Magnetic configurations of finite-length chains of Mn atoms on a Pt(332) surface have been theoretically studied within a classical model taking into account the exchange Heisenberg interaction, biaxial magnetocrystalline anisotropy, the Dzyaloshinskii–Moriya interaction, the dipole–dipole interaction, and the Zeeman interaction of the magnetic moments of atoms with an external magnetic field. It has been shown that both nearly collinear and helical magnetic states can be stable. An applied magnetic field causes the rotation of the plane in which the helical magnetic structure lies. The stability of these states in the external magnetic field parallel to the easy axis has been examined. It has been found that the Mn/Pt(332) system is characterized by two critical fields, the lower of which is associated with the finite length of the atomic chain. The predicted effects are due to the Dzyaloshinskii–Moriya interaction and can be observed experimentally.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"121 - 127"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026606871.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853895","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
Spatial Differentiation of Optical Signal Based on Fourier Filtering with Pixel and Gradient Metasurfaces 基于像素和梯度超表面傅里叶滤波的光信号空间分异
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026601624
V. V. Yushkov, P. D. Kiryanov, A. S. Shorokhov, A. A. Fedyanin
{"title":"Spatial Differentiation of Optical Signal Based on Fourier Filtering with Pixel and Gradient Metasurfaces","authors":"V. V. Yushkov,&nbsp;P. D. Kiryanov,&nbsp;A. S. Shorokhov,&nbsp;A. A. Fedyanin","doi":"10.1134/S0021364026601624","DOIUrl":"10.1134/S0021364026601624","url":null,"abstract":"<p>Analog computations based on spatial Fourier filtering in a 4<i>f</i>-system enable the approaches of mathematical operations on images entirely optically, providing their pre-digital processing at high speed. Conventional implementations based on refractive elements are bulky and challenging from the standpoint of scalability. Due to efficient wavefront control, optical metasurfaces make it possible to replace such elements with planar nanostructures, ensuring compactness and subwavelength resolution in controlling the amplitude and phase of light. In this paper a comparison is carried out between pixel-based and gradient-based design approaches for optical metasurfaces based on gallium arsenide nanorings for spatial differentiation. In the pixel-based algorithm, each region of the metasurface (pixel) is considered as a square periodic lattice of identical nanoresonators. The gradient-based algorithm enables topology optimization by smoothly varying the size of nanorings across the metasurface. Despite the assumption that the gradient approach minimizes the artifacts inherent in pixel-based structures and ensures a more accurate matching with the required mathematical operation, the pixel structure demonstrates a Pearson correlation coefficient with the theoretical dependences that is 6–8% higher than that of the gradient structure.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"96 - 102"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601624.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853897","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
Classification of Phase States of the Ising Model Using a Graph Neural Network 基于图神经网络的Ising模型相态分类
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026601491
P. A. Ovchinnikov, Z. A. Moskovchenko, M. E. Tsuranova, K. S. Soldatov
{"title":"Classification of Phase States of the Ising Model Using a Graph Neural Network","authors":"P. A. Ovchinnikov,&nbsp;Z. A. Moskovchenko,&nbsp;M. E. Tsuranova,&nbsp;K. S. Soldatov","doi":"10.1134/S0021364026601491","DOIUrl":"10.1134/S0021364026601491","url":null,"abstract":"<p>An approach based on a graph neural network has been developed to recognize phase states and to estimate the critical temperature of finite-size systems within the Ising model. The advantage of the new approach is the explicit specification of the lattice geometry and bond structure using a graph. This allows a unified transfer of equilibrium spin configurations of lattices of different spatial dimensions and geometries to the input of the neural network. This method has been applied to seven different lattices: two-dimensional square, triangular, hexagonal, and two-dimensional Apamea lattice, as well as three-dimensional simple cubic, bcc, and fcc lattices. It has been shown that the critical temperature can be extracted by crossing the output of the neural network with the 1/2 level. Feeding a small sample of equilibrium configurations to the input of a graph neural network allows achieving the mean absolute error 9.7 × 10<sup>–3</sup> relative to the reference value <span>(T_{c}^{{{text{ref}}}})</span>. An additional scaling analysis has been performed for the Apamea lattice, which has shown that the neural network estimate of the critical temperature is consistent with the intersection point of the Binder cumulant curves for systems of different sizes.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"110 - 116"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853901","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
Optically Controlled Mesoscopic Spin Gate–Modulator 光控介观自旋门调制器
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026601594
R. G. Nazmitdinov
{"title":"Optically Controlled Mesoscopic Spin Gate–Modulator","authors":"R. G. Nazmitdinov","doi":"10.1134/S0021364026601594","DOIUrl":"10.1134/S0021364026601594","url":null,"abstract":"<p>It has been shown that a one-dimensional quantum ring with an asymmetric (mutually perpendicular) contact arrangement exposed to a nonresonance terahertz pulse serves as an optical spin gate modulator operating in a zero magnetic field. The implementation of a dynamic (optically controlled) analogue of the Datta–Das spin field-effect transistor with ferromagnetic contacts, which ensures ultrafast contactless control of the spin channel conductivity, has been demonstrated using the Floquet–Magnus expansion. The proposed circuit opens new prospects for the creation of coherent terahertz spintronic logic devices.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"128 - 137"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601594.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148854722","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
Operation of a Copper Vapor Laser at Pulse Repetition Frequencies up to 100 kHz with an Output Power Exceeding 200 W/m 铜蒸气激光器的脉冲重复频率高达100khz，输出功率超过200w /m
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026607220
P. A. Bokhan, P. P. Gugin, D. E. Zakrevsky, V. A. Kim, M. A. Lavrukhin
{"title":"Operation of a Copper Vapor Laser at Pulse Repetition Frequencies up to 100 kHz with an Output Power Exceeding 200 W/m","authors":"P. A. Bokhan,&nbsp;P. P. Gugin,&nbsp;D. E. Zakrevsky,&nbsp;V. A. Kim,&nbsp;M. A. Lavrukhin","doi":"10.1134/S0021364026607220","DOIUrl":"10.1134/S0021364026607220","url":null,"abstract":"<p>Parametric studies of Cu–Ne and Cu–Ne–H<sub>2</sub> lasers have been performed under significantly different conditions with an pump pulse front length of ~1 ns. It has been shown that the average lasing power in the train mode in a gas-discharge tube 2 cm in diameter with a hydrogen pressure in the working mixture of 1.5 Torr increases linearly to 100 kHz, reaching a linear value of 270 W/m. The lasing efficiency in the Cu–Ne mixture exceeds 5%. Prospects for a further increase in the energy parameters of the copper vapor laser have been discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"146 - 151"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853896","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
Crystals Instead of Magnets: A New Approach to Accelerator Beam Control (Brief Review) 晶体代替磁体：加速器束流控制的新方法（综述）
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-30 DOI: 10.1134/S0021364026607219
S. F. Reshetnikov, Yu. A. Chesnokov, A. A. Yanovich
{"title":"Crystals Instead of Magnets: A New Approach to Accelerator Beam Control (Brief Review)","authors":"S. F. Reshetnikov,&nbsp;Yu. A. Chesnokov,&nbsp;A. A. Yanovich","doi":"10.1134/S0021364026607219","DOIUrl":"10.1134/S0021364026607219","url":null,"abstract":"<p>The development of accelerator technology is limited by the resource-intensive nature of traditional methods for forming particle beams, especially at high energies. Current accelerators involve slow beam extraction and magnetic focusing, which are inefficient at energies above 1 TeV. A new method involving crystals for the focusing and deflection of beams has been developed in this work. At high energies, the scattering of secondary particles is reduced, allowing crystals to be effectively used instead of magnets. This technology is also promising for the U-70 accelerator (Protvino, Russia). The goal of this work is to create crystalline systems for forming various particle beams.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"81 - 91"},"PeriodicalIF":1.1,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607219.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853899","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
Optical Frequency Comb Generation in a Cylindrical Whispering Gallery Mode Microresonator 在圆柱低语廊模式微谐振器中产生光频梳
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364026607281
A. D. Novikov, I. D. Vatnik
{"title":"Optical Frequency Comb Generation in a Cylindrical Whispering Gallery Mode Microresonator","authors":"A. D. Novikov,&nbsp;I. D. Vatnik","doi":"10.1134/S0021364026607281","DOIUrl":"10.1134/S0021364026607281","url":null,"abstract":"<p>This work demonstrates optical frequency comb generation in a cylindrical whispering-gallery mode microresonator fabricated on the surface of an optical fiber. The optimization of the microresonator shape, mode volume, and coupling strength between the excitation element and the microresonator enabled the achievement of a record loaded quality factor of 10<sup>8</sup> for this type of microresonator, as well as parametric nonlinear generation at a pump power of 40 mW.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 1","pages":"73 - 79"},"PeriodicalIF":1.1,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607281.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807420","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
On the Plasma Phase Transition in Multiply Ionized Warm Dense Cesium 多层电离热致密铯的等离子体相变研究
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-08-22 DOI: 10.1134/S0021364025607389
A. A. Filatkin, I. M. Saitov, G. E. Norman
{"title":"On the Plasma Phase Transition in Multiply Ionized Warm Dense Cesium","authors":"A. A. Filatkin,&nbsp;I. M. Saitov,&nbsp;G. E. Norman","doi":"10.1134/S0021364025607389","DOIUrl":"10.1134/S0021364025607389","url":null,"abstract":"<p>A quantum molecular dynamics simulation of warm dense cesium has been carried out. Indications of a first-order phase transition have been observed. The region of this transition is isolated from known phase transitions in cesium. In contrast to those phase transitions, for the new transition, it has been found that within a certain range of specific volume, metastable states on the isotherm of one phase overlap with the equilibrium states on the isotherm of the second phase, as has been already predicted for the plasma phase transition. The two phases are close to each other in pressure, but differ significantly in conductivity. The parameters of the upper and lower critical points of the expected transition have been estimated.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 1","pages":"34 - 40"},"PeriodicalIF":1.1,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807412","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
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