JETP Letters最新文献_第9页

Ultrashort Pulses in the Structural Analysis of Diamond Layers with NV Centers 超短脉冲在具有 NV 中心的金刚石层结构分析中的应用

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-13 DOI: 10.1134/S0021364024603567

D. N. Makarov, M. K. Eseev, E. S. Gusarevich, K. A. Makarova, M. S. Borisov

引用次数: 0

Stochastic Renewal Equation for the Waiting Time Statistics for the First Occurrence of a Specific Sequence of States Successively Visited by an Alternating Renewal Process 交替更新过程连续访问特定状态序列首次出现的等待时间统计的随机更新方程

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-13 DOI: 10.1134/S0021364024602859

S. A. Belan

引用次数: 0

Transformation of a Geodesic Acoustic Mode in the Presence of a Low-Frequency Zonal Flow in a Tokamak Plasma 托卡马克等离子体中存在低频带状流时大地声波模式的转变

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-13 DOI: 10.1134/S0021364024602963

E. A. Sorokina

引用次数: 0

Marburger Formula for Elliptically Polarized Light Beams in a Nonlinear Nonlocal Medium 非线性非局部介质中椭圆偏振光束的Marburger公式

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-13 DOI: 10.1134/S0021364024603543

N. Yu. Kuznetsov, K. S. Grigoriev, V. A. Makarov

引用次数: 0

Concept of a Convex on-Chip Metalens as a Miniature Sensor of Fluorescence of Single Molecules 凸面片上金属传感器作为单分子荧光微型传感器的概念

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-13 DOI: 10.1134/S002136402460277X

F. A. Shuklin, E. Yu. Barulina, S. M. Novikov, A. I. Chernov, A. V. Barulin

{"title":"Concept of a Convex on-Chip Metalens as a Miniature Sensor of Fluorescence of Single Molecules","authors":"F. A. Shuklin, E. Yu. Barulina, S. M. Novikov, A. I. Chernov, A. V. Barulin","doi":"10.1134/S002136402460277X","DOIUrl":"10.1134/S002136402460277X","url":null,"abstract":"Fluorescence spectroscopy of single molecules is of fundamental significance to determine a small amount of matter and to study molecular dynamic processes. However, the applications of this method in medicine require new solutions for the miniaturization of a sensor planform. The most promising direction in this area seems to be the development of photonic integrated circuits with a high molecule detection efficiency in a volume of about cubic micron. In this work, a concept of a dielectric metalens on a waveguide, which has a high efficiency of the focusing/collection of radiation from an aqueous solution, has been presented. The structure of the metalens with a numerical aperture of above 1.1 operating in the optical range near the fluorescence maximum of the Alexa Fluor 647 dye has been simulated. After the calculation of the molecule detection efficiency, diffusion autocorrelation functions of Alexa Fluor 647 molecules have been calculated to characterize the possibility of measuring the brightness, as well as the number and dynamics of single molecules in the focal volume of the metalens. This concept provides the foundation for the development of future sensors of single molecules as biomedical and environment screening tools.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 9","pages":"687 - 694"},"PeriodicalIF":1.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402460277X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821441","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

Universal Momentum Distributions and Short-Range Nucleon Correlations 通用动量分布和短程核子关联

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-04 DOI: 10.1134/S0021364024602720

O. A. Rubtsova, V. N. Pomerantsev

引用次数: 0

Features of Resonant Raman Scattering in Superhard Amorphous Carbon 超硬非晶碳的共振拉曼散射特性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-04 DOI: 10.1134/S0021364024603397

M. Yu. Popov, F. S. Khorobrykh, S. A. Klimin, D. A. Ovsyannikov

{"title":"Features of Resonant Raman Scattering in Superhard Amorphous Carbon","authors":"M. Yu. Popov, F. S. Khorobrykh, S. A. Klimin, D. A. Ovsyannikov","doi":"10.1134/S0021364024603397","DOIUrl":"10.1134/S0021364024603397","url":null,"abstract":"The resonant Raman scattering phenomena in carbon nanoclusters formed by sp3 bonds have been investigated. Such structures have been synthesized from fullerite С60 at pressures of 20–25 GPa at room temperature and under heating to 1400 K. Two types of Raman resonance are observed. The first type is associated with the resonant enhancement of the Raman spectra near the absorption edge and has been observed for the prepared samples under laser excitation at wavelengths of 1064 and 532 nm. In such spectra, high-frequency sp3 modes of all nanoclusters from 1388 to 1640 cm–1 are observed. The second type of resonance manifests itself in the activation of one of the modes in the range of 1388–1640 cm–1 of the Raman spectrum, depending on the exciting-radiation wavelength. The frequency of the active mode is a linear function of the exciting-radiation wavelength. The piezospectroscopy method has been used to show that under the excitation with a shorter wavelength, clusters with a larger bulk compression modulus are involved in the Raman scattering processes.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 8","pages":"589 - 592"},"PeriodicalIF":1.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778456","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

Detection of Resonant Collisional Radiative Transfer of the Vibrational Energy between Molecules Subjected to Infrared Laser Multiphoton Excitation in a Two-Component Medium 双组分介质中红外激光多光子激发下分子间振动能量共振碰撞辐射传递的探测

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-04 DOI: 10.1134/S0021364024603506

G. N. Makarov, A. N. Petin

{"title":"Detection of Resonant Collisional Radiative Transfer of the Vibrational Energy between Molecules Subjected to Infrared Laser Multiphoton Excitation in a Two-Component Medium","authors":"G. N. Makarov, A. N. Petin","doi":"10.1134/S0021364024603506","DOIUrl":"10.1134/S0021364024603506","url":null,"abstract":"Resonant collisional radiative transfer of the vibrational energy between molecules subjected to infrared laser multiphoton excitation in a two-component medium has been studied. Experiments have been carried out with BCl3 molecules of the natural isotopic composition in a mixture with CH3F molecules, which are optically active sensitizers and acceptors of radicals. Both types of molecules resonantly absorb laser radiation. Resonant collisional radiative energy transfer from CH3F molecules to 10BCl3 ones has been observed. It has been shown that this process significantly increases the dissociation yield of 10BCl3 and 11BCl3 molecules compared to the dissociation yield with neutral acceptors of radicals. Dependences of the dissociation yields of BCl3 molecules on the pump laser frequency have demonstrated a structure that closely correlates with the structure of the infrared absorption spectrum of CH3F molecules. The method has been described and the experimental results have been reported. Conditions for efficient resonant collisional radiative transfer of the vibrational energy between molecules subjected to infrared laser multiphoton excitation have been discussed.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 8","pages":"593 - 598"},"PeriodicalIF":1.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778459","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

Nonequilibrium Heating of Electrons, Melting, and Modification of a Nickel Nanofilm by an Ultrashort Terahertz Pulse 超短太赫兹脉冲对镍纳米膜的非平衡加热、熔化和改性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-04 DOI: 10.1134/S002136402460349X

S. I. Ashitkov, P. S. Komarov, A. V. Ovchinnikov, S. A. Romashevskiy, E. V. Struleva, O. V. Chefonov, M. B. Agranat

引用次数: 0

Influence of Anisotropy on the Study of the Critical Behavior of Spin Models by Machine Learning Methods 各向异性对机器学习方法研究自旋模型临界行为的影响

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-04 DOI: 10.1134/S0021364024603440

D. D. Sukhoverkhova, L. N. Shchur

{"title":"Influence of Anisotropy on the Study of the Critical Behavior of Spin Models by Machine Learning Methods","authors":"D. D. Sukhoverkhova, L. N. Shchur","doi":"10.1134/S0021364024603440","DOIUrl":"10.1134/S0021364024603440","url":null,"abstract":"In this paper, we applied a deep neural network to study the issue of knowledge transferability between statistical mechanics models. The following computer experiment was conducted. A convolutional neural network was trained to solve the problem of binary classification of snapshots of the Ising model’s spin configuration on a two-dimensional lattice. During testing, snapshots of the Ising model spins on a lattice with diagonal ferromagnetic and antiferromagnetic connections were fed to the input of the neural network. Estimates of the probability of samples belonging to the paramagnetic phase were obtained from the outputs of the tested network. The analysis of these probabilities allowed us to estimate the critical temperature and the critical correlation length exponent. It turned out that at weak anisotropy the neural network satisfactorily predicts the transition point and the value of the correlation length exponent. Strong anisotropy leads to a noticeable deviation of the predicted values from the precisely known ones. Qualitatively, strong anisotropy is associated with the presence of oscillations of the correlation function above the Stefenson disorder temperature and further approach to the point of the fully frustrated case.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 8","pages":"616 - 621"},"PeriodicalIF":1.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603440.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778458","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