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Digital Control of a Superconducting Adiabatic Sigma Neuron 超导绝热Sigma神经元的数字控制
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-25 DOI: 10.1134/S0021364025605779
M. V. Bastrakova, D. S. Pashin, G. I. Gubochkin, A. E. Schegolev, S. V. Bakurskiy, I. I. Soloviev, N. V. Klenov
{"title":"Digital Control of a Superconducting Adiabatic Sigma Neuron","authors":"M. V. Bastrakova,&nbsp;D. S. Pashin,&nbsp;G. I. Gubochkin,&nbsp;A. E. Schegolev,&nbsp;S. V. Bakurskiy,&nbsp;I. I. Soloviev,&nbsp;N. V. Klenov","doi":"10.1134/S0021364025605779","DOIUrl":"10.1134/S0021364025605779","url":null,"abstract":"<p>Superconducting adiabatic neurons based on quantum parametrons make it possible to “calculate” sigmoid activation functions and their derivatives in an analog manner in one cycle with record energy efficiency. However, for the application of such systems, it is necessary to determine operation regimes that allow integration with Josephson digital circuits, where information is presented in the form of sequences of picosecond unipolar voltage pulses. The conditions allowing the pulse control of an adiabatic sigma neuron have been theoretically determined in this work. The obtained results allowed us to develop the design of the basic unit for the hardware implementation of analog–digital Josephson neural networks.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 9","pages":"719 - 726"},"PeriodicalIF":1.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605779.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169402","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
Amorphization of Silicon Exposed to Ultrashort Mid-Infrared Laser Pulses 超短中红外激光脉冲下硅的非晶化
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-25 DOI: 10.1134/S0021364025606049
N. I. Busleev, P. P. Pakholchuk, N. A. Smirnov
{"title":"Amorphization of Silicon Exposed to Ultrashort Mid-Infrared Laser Pulses","authors":"N. I. Busleev,&nbsp;P. P. Pakholchuk,&nbsp;N. A. Smirnov","doi":"10.1134/S0021364025606049","DOIUrl":"10.1134/S0021364025606049","url":null,"abstract":"<p>The amorphization of the surface of a 380-μm-thick crystalline Si(111) wafer exposed to 150-fs ultrashort laser pulses of the mid-infrared region of 4.0–5.4 μm with variable energy density and exposure time has been experimentally studied. For this spectral range, the threshold fluences for silicon amorphization have been measured. The dependence of the volume fraction and thickness of the amorphous phase of the material on the fluence and the number of laser pulses at a wavelength of 5000 nm has been established.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 9","pages":"697 - 701"},"PeriodicalIF":1.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169710","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
Dependence of the Vibrational Frequencies of a Graphene Sheet on the Ratio of Its Sides and the Number of Vacancy Defects 石墨烯片的振动频率与边长比和空位缺陷数的关系
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-25 DOI: 10.1134/S0021364024605438
Z. A. Akhmatov, Z. A. Akhmatov
{"title":"Dependence of the Vibrational Frequencies of a Graphene Sheet on the Ratio of Its Sides and the Number of Vacancy Defects","authors":"Z. A. Akhmatov,&nbsp;Z. A. Akhmatov","doi":"10.1134/S0021364024605438","DOIUrl":"10.1134/S0021364024605438","url":null,"abstract":"<p>The vibration behavior of a single-layer graphene sheet has been studied by the molecular dynamics method. The dependence of the vibrational frequencies of the graphene sheet on its size and the concentration of vacancy defects has been obtained. It has been found that the dependence of the type of vibrational modes and their number on the aspect ratio of the graphene sheet is very different for large and small samples. It has been shown that ripples appear in narrow graphene sheets (nanoribbons), reducing the vibrational frequencies. In the case of nanoribbons with an aspect ratio <i>x</i>/<i>y</i> ≥ 3.5, the influence of ripples becomes significant and leads not only to a decrease in the vibrational frequencies, but also to the disappearance of the fundamental vibrational modes.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 9","pages":"702 - 708"},"PeriodicalIF":1.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169707","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
Inelastic Effects in the Lee–Yang Model 李-杨模型中的非弹性效应
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-25 DOI: 10.1134/S0021364025600223
D. Menskoy
{"title":"Inelastic Effects in the Lee–Yang Model","authors":"D. Menskoy","doi":"10.1134/S0021364025600223","DOIUrl":"10.1134/S0021364025600223","url":null,"abstract":"<p>In this work, the theories in which the renormalization group flow passes near the Lee–Yang critical point are analyzed. Such theories can be described effectively as perturbations of the massive Lee–Yang theory by irrelevant operators. The perturbation induced by one of the descendants of a single nontrivial primary operator <span>(varphi )</span> of the theory is considered. It is shown that such a perturbation breaks the integrability of the system. The inelastic scattering cross section for the corresponding <span>(2 to 3)</span> process with the generation of particles is calculated up to the normalization factor. In particular, the asymptotic forms of the cross sections are calculated for high energies and above the particle generation threshold.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 9","pages":"746 - 751"},"PeriodicalIF":1.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169708","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
Smith–Purcell Radiation in Dielectric and the Anomalous Doppler Effect 电介质中的史密斯-珀塞尔辐射和异常多普勒效应
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-25 DOI: 10.1134/S0021364025605755
A. P. Potylitsyn
{"title":"Smith–Purcell Radiation in Dielectric and the Anomalous Doppler Effect","authors":"A. P. Potylitsyn","doi":"10.1134/S0021364025605755","DOIUrl":"10.1134/S0021364025605755","url":null,"abstract":"<p>The features of Smith–Purcell radiation in a dielectric from a grating consisting of metal strips deposited on the surface of the dielectric is considered. Smith–Purcell radiation is able to propagate in the dielectric at an angle smaller than the angle of the Cherenkov cone. This can be considered as a manifestation of the so-called anomalous Doppler effect. An experiment aimed at detecting the anomalous Doppler effect in the gigahertz range on a relativistic electron beam is proposed and substantiated.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 9","pages":"691 - 696"},"PeriodicalIF":1.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605755.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169401","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
Stimulated Raman Scattering Amplification under Ultrasound 超声下受激拉曼散射放大
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-10 DOI: 10.1134/S0021364025606736
M. A. Karpov, A. D. Kudryavtseva, T. V. Mironova, A. B. Nadykto, M. A. Shevchenko, N. V. Tcherniega, S. F. Umanskaya
{"title":"Stimulated Raman Scattering Amplification under Ultrasound","authors":"M. A. Karpov,&nbsp;A. D. Kudryavtseva,&nbsp;T. V. Mironova,&nbsp;A. B. Nadykto,&nbsp;M. A. Shevchenko,&nbsp;N. V. Tcherniega,&nbsp;S. F. Umanskaya","doi":"10.1134/S0021364025606736","DOIUrl":"10.1134/S0021364025606736","url":null,"abstract":"<p>We observe that ultrasound applied to water surprisingly results in a substantial enhancement of the stimulated Raman scattering (SRS) intensity in both forward and backward directions, and returns to the initial level after the ultrasound is stopped. Quantitatively, the first Stokes component of SRS increases by approximately 4 and 2.5–3 times in the forward and backward directions, respectively, while the second Stokes component exhibits a 5–6-fold increase. This striking SRS enhancement is accompanied by a simultaneous decrease in the elastic scattering intensity, which suggests an energy redistribution between scattering mechanisms. The effect is observed only at picosecond laser pumping (30 ps, 10 mJ, 10 Hz): no increase is observed when nanosecond laser pulses are used. This points out to randomly distributed feedback as an underlying physical mechanism. The SRS intensity enhancement was also observed in ethanol and acetone. The mechanism certainly requires further careful and detailed study.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"890 - 894"},"PeriodicalIF":1.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163666","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
Classical Integrable Spin Chains of Landau–Lifshitz Type from R-Matrix Identities 基于r -矩阵恒等式的Landau-Lifshitz型经典可积自旋链
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-10 DOI: 10.1134/S0021364025606967
D. Domanevsky, A. Zotov
{"title":"Classical Integrable Spin Chains of Landau–Lifshitz Type from R-Matrix Identities","authors":"D. Domanevsky,&nbsp;A. Zotov","doi":"10.1134/S0021364025606967","DOIUrl":"10.1134/S0021364025606967","url":null,"abstract":"<p>We describe a family of 1+1 classical integrable space-discrete models of the Landau–Lifshitz type through the usage of ansatz for <i>U</i>–<i>V</i> (Lax) pair with spectral parameter satisfying the semi-discrete Zakharov–Shabat equation. The ansatz for <i>U</i>–<i>V</i> pair is based on <span>(R)</span>-matrices satisfying the associative Yang–Baxter equation and certain additional properties. Equations of motion are obtained using a set of <span>(R)</span>-matrix identities. In the continuous limit we reproduce the previously known family of the higher rank Landau–Lifshitz equations.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"921 - 926"},"PeriodicalIF":1.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606967.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164113","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
Ferromagnetic Phase Transition in a Multivalley Electron System 多谷电子系统中的铁磁相变
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605809
S. A. Andreeva, A. V. Shchepetilnikov, G. A. Nikolaev, A. R. Khisameeva, O. V. Orlov, T. M. Kurbanov, Ya. V. Fedotova, A. A. Dremin, I. V. Kukushkin
{"title":"Ferromagnetic Phase Transition in a Multivalley Electron System","authors":"S. A. Andreeva,&nbsp;A. V. Shchepetilnikov,&nbsp;G. A. Nikolaev,&nbsp;A. R. Khisameeva,&nbsp;O. V. Orlov,&nbsp;T. M. Kurbanov,&nbsp;Ya. V. Fedotova,&nbsp;A. A. Dremin,&nbsp;I. V. Kukushkin","doi":"10.1134/S0021364025605809","DOIUrl":"10.1134/S0021364025605809","url":null,"abstract":"<p>The quantum phase transition has been discovered in a multivalley two-dimensional electron system confined in an AlAs quantum well at low temperatures and high magnetic fields. The transition has occurred with a successive increase in the tilt angle of the magnetic field and has been accompanied by the appearance of a sharp peak in the longitudinal resistance of the sample. The electron spin resonance technique has made it possible to identify the type of the observed phase transition, which is extremely difficult to determine by conventional transport approaches. At the same time, the component of the magnetic field in the plane of the quantum well is directed in such a way that the spin resonance of the electrons occupying each of the valleys can be measured independently. Analysis of the evolution of the relative amplitude of resonances has demonstrated that the observed phase transition is attributed to the spin type; i.e., it is accompanied by a macroscopic change in the spin polarization without changing the relative valley population.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 8","pages":"642 - 647"},"PeriodicalIF":1.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605809.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171612","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
Measurement of the Magnetoplasmon Density of States in the Radiative Recombination Spectrum of Symmetrically Doped Quantum Wells 对称掺杂量子阱辐射复合谱中磁等离激元态密度的测量
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605871
E. M. Budanov, D. A. Shchigarev, L. V. Kulik, A. B. Van’kov, A. V. Larionov, A. V. Gorbunov, V. Umansky
{"title":"Measurement of the Magnetoplasmon Density of States in the Radiative Recombination Spectrum of Symmetrically Doped Quantum Wells","authors":"E. M. Budanov,&nbsp;D. A. Shchigarev,&nbsp;L. V. Kulik,&nbsp;A. B. Van’kov,&nbsp;A. V. Larionov,&nbsp;A. V. Gorbunov,&nbsp;V. Umansky","doi":"10.1134/S0021364025605871","DOIUrl":"10.1134/S0021364025605871","url":null,"abstract":"<p>Photoluminescence spectra of symmetrically and asymmetrically doped quantum wells in highly mobile GaAs/AlGaAs heterostructures have been investigated. Additional maxima have been found in the magnetoplasmon replica of the main optical transition from the conduction band to the heavy hole subband of the valence band of a symmetrically doped quantum well at the electron filling factor ν = 1. Maxima in the photoluminescence spectrum are attributed to Van Hove singularities in the magnetoplasmon density of states as a function of the energy. The correlation of the observed features in the photoluminescence spectrum with known transport and optical studies has been discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 8","pages":"648 - 654"},"PeriodicalIF":1.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605871.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171613","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
Ultrafast Luminescence Kinetics and Localization Effects of Nonequilibrium Carriers in Degenerate n-InGaN Layers 简并n-InGaN层中非平衡载流子的超快发光动力学及局部化效应
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364024605207
K. E. Kudryavtsev, D. N. Lobanov, M. A. Kalinnikov, A. V. Novikov, B. A. Andreev, Z. F. Krasil’nik
{"title":"Ultrafast Luminescence Kinetics and Localization Effects of Nonequilibrium Carriers in Degenerate n-InGaN Layers","authors":"K. E. Kudryavtsev,&nbsp;D. N. Lobanov,&nbsp;M. A. Kalinnikov,&nbsp;A. V. Novikov,&nbsp;B. A. Andreev,&nbsp;Z. F. Krasil’nik","doi":"10.1134/S0021364024605207","DOIUrl":"10.1134/S0021364024605207","url":null,"abstract":"<p>The effects of localization of nonequilibrium holes in degenerate epitaxial <i>n</i>-InGaN films with a high (~60%) indium content, which emit in the near-infrared region, are investigated. Using the photoluminescence spectroscopy data with the picosecond time resolution, the energy scales of the tails of the bands, the localization energy, and the width of the distribution of nonequilibrium holes in the random potential relief have been determined. Within the model of recombination of free electrons and localized holes, the character of the temperature quenching of emission and the red shift of the generation wavelength relative to spontaneous emission have been explained.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 8","pages":"655 - 661"},"PeriodicalIF":1.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024605207.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171614","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
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