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Generalized Model of the Superconducting Sigma Neuron 超导Sigma神经元的广义模型
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024603427
N. S. Shuravin, L. N. Karelina, A. S. Ionin, F. A. Razorenov, M. S. Sidel’nikov, S. V. Egorov, V. V. Bol’ginov
{"title":"Generalized Model of the Superconducting Sigma Neuron","authors":"N. S. Shuravin,&nbsp;L. N. Karelina,&nbsp;A. S. Ionin,&nbsp;F. A. Razorenov,&nbsp;M. S. Sidel’nikov,&nbsp;S. V. Egorov,&nbsp;V. V. Bol’ginov","doi":"10.1134/S0021364024603427","DOIUrl":"10.1134/S0021364024603427","url":null,"abstract":"<p>The superconducting sigma neuron is a single-junction interferometer, with a part of the circuit shunted by an additional inductance, which is also used to generate the output signal. It was previously predicted that the transfer function of this device would be close to the sigmoidal one at a certain relation between the values of inductance of its parts. This interferometer can be fabricated as a multilayer thin-film structure over a superconducting screen, which allows measuring the output magnetic flux in a single element. An analysis of the experimental data showed that the use of a superconducting screen did not ensure complete independence of the sigma neuron elements, as was assumed in the theoretical model. This paper presents a generalized model of the stationary state of a sigma neuron that takes into account the interaction between all its parts, including the input and readout elements.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"829 - 836"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603427.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994825","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
Threshold Photogeneration of Biexcitons in Direct-Gap Semiconductor Nanocrystals 直接间隙半导体纳米晶体中双激子的阈值光产生
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024603749
S. A. Fomichev, V. A. Burdov
{"title":"Threshold Photogeneration of Biexcitons in Direct-Gap Semiconductor Nanocrystals","authors":"S. A. Fomichev,&nbsp;V. A. Burdov","doi":"10.1134/S0021364024603749","DOIUrl":"10.1134/S0021364024603749","url":null,"abstract":"<p>The generation of two electron–hole pairs (a biexciton) in a nanocrystal of a direct-gap semiconductor with a nondegenerate conduction band upon the absorption of a single photon with the energy equal to twice the band gap of the nanocrystal is considered. It is shown that the process can take place only in the presence of the interaction of electrons both with each other and with the crystal-lattice field. The rate of this process is calculated and found to depend strongly on the nanocrystal size.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"822 - 828"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994829","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
Relaxation Phenomena in Dilute Charged Solutions 稀带电溶液中的弛豫现象
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024604627
B. Timofeev, V. Shikin
{"title":"Relaxation Phenomena in Dilute Charged Solutions","authors":"B. Timofeev,&nbsp;V. Shikin","doi":"10.1134/S0021364024604627","DOIUrl":"10.1134/S0021364024604627","url":null,"abstract":"<p>The study of transport phenomena in conductive media of different dimensions often involves impedance diagnostics. The desire to exclude the influence of contact phenomena accompanying dc measurements on the current–voltage characteristic is a general reason for the application of complicated ac measurements instead of the quite methodologically simple dc regime. Relaxation phenomena in electrolytes with electrohydrodynamics linear in the density of the dopant <i>n</i><sub>d</sub> have been analyzed in detail in this work. It has been shown that the well-known Debye–Hückel–Onsager theory of the electrolyte conductivity cannot ensure the linearity of electrohydrodynamics of dilute solutions in the density <i>n</i><sub>d</sub>. Its linear alternative based on the theory of transport in finely dispersed two-phase systems called Maxwell formalism has been proposed. It has been shown that this allows one to interpret the observed relaxation time in the form <span>({{tau }_{c}} simeq RC)</span>, where <i>R</i> is the resistance of the bulk portion of a cell with an electrolyte in terms of the Maxwell formalism and <i>C</i> is the electrolytic capacitance of the metal–electrolyte transition regions appearing on its control electrodes. Examples of the successful use of <i>RC</i>-matched ac diagnostics have been discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"843 - 853"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994996","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
Manifestation of Layer-by-Layer Localization of van Hove Singularities in Tunneling between Bilayer Graphene Sheets 双层石墨烯间隧道中范霍夫奇点逐层定位的表现
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024604019
E. E. Vdovin, Yu. N. Khanin, S. V. Morozov, M. A. Kashchenko, A. A. Sokolik, K. S. Novoselov
{"title":"Manifestation of Layer-by-Layer Localization of van Hove Singularities in Tunneling between Bilayer Graphene Sheets","authors":"E. E. Vdovin,&nbsp;Yu. N. Khanin,&nbsp;S. V. Morozov,&nbsp;M. A. Kashchenko,&nbsp;A. A. Sokolik,&nbsp;K. S. Novoselov","doi":"10.1134/S0021364024604019","DOIUrl":"10.1134/S0021364024604019","url":null,"abstract":"<p>Tunneling between two sheets of bilayer graphene, the crystal lattices of which are rotated relative to each other by a small angle, has been studied. An anomalous behavior of the tunneling conductivity caused by van Hove singularities at the edges of the conduction and valence bands spatially localized in different sheets of bilayer graphene has been found.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"854 - 859"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604019.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994923","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
Spectrum of Primary Gravitational Waves in the Quantum Version of Conformal General Relativity 保形广义相对论量子版中的初级引力波谱
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024603920
A. B. Arbuzov, A. A. Nikitenko
{"title":"Spectrum of Primary Gravitational Waves in the Quantum Version of Conformal General Relativity","authors":"A. B. Arbuzov,&nbsp;A. A. Nikitenko","doi":"10.1134/S0021364024603920","DOIUrl":"10.1134/S0021364024603920","url":null,"abstract":"<p>The spectral power of primordial gravitational waves is calculated in the quantum version of conformal general relativity. The fundamental variables of quantum gravity in the used approach are special variables, which constitute the dynamic part of the spin connection, rather than components of the metric tensor. It has been shown that the proposed model in the Born approximation reproduces the standard spectral power of primordial gravitational waves generated in the canonical inflation process. This has made it possible to test the quantum version of the conformal theory of gravity in a specific phenomenological problem.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"860 - 866"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603920.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994924","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
Ionization and Charge Exchange Processes Induced by Collisions of Protons with Atoms of Superheavy Elements 质子与超重元素原子碰撞诱导的电离和电荷交换过程
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024604202
I. Yu. Tolstikhina, V. P. Shevel’ko
{"title":"Ionization and Charge Exchange Processes Induced by Collisions of Protons with Atoms of Superheavy Elements","authors":"I. Yu. Tolstikhina,&nbsp;V. P. Shevel’ko","doi":"10.1134/S0021364024604202","DOIUrl":"10.1134/S0021364024604202","url":null,"abstract":"<p>The cross sections for charge exchange and ionization induced by collisions of protons with the energies from 0.01 keV to 10 MeV with atoms of the superheavy elements Nh (<i>Z</i> = 113), Fl (<i>Z</i> = 114), Mc (<i>Z</i> = 115), Lv (<i>Z</i> = 116), Ts (<i>Z</i> = 117), and Og (<i>Z</i> = 118) have been calculated. These cross sections at the energies <i>E</i> ≈ 0.01−100 keV and <i>E</i> &gt; 100 keV have been calculated in the adiabatic approximation and in the Born approximation with the cross section normalization, respectively. Since data on the cross sections for superheavy elements under consideration are absent, cross sections for Xe (<i>Z</i> = 54) and U (<i>Z</i> = 92) atoms have also been calculated and compared with the available experimental data and theoretical calculations. The distinctive properties of the charge exchange and ionization cross sections for atoms of superheavy elements have been revealed using the results of this work.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"810 - 815"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994824","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 Theoretical Interpretation of the Data on Collisions of Argon Nuclei with Various Nuclei at High Energies 高能氩核与各种核碰撞数据的理论解释
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024603944
V. V. Uzhinsky, A. S. Galoyan, N. A. Chalyi
{"title":"On the Theoretical Interpretation of the Data on Collisions of Argon Nuclei with Various Nuclei at High Energies","authors":"V. V. Uzhinsky,&nbsp;A. S. Galoyan,&nbsp;N. A. Chalyi","doi":"10.1134/S0021364024603944","DOIUrl":"10.1134/S0021364024603944","url":null,"abstract":"<p>Recently (2024), the NA61/SHINE collaboration has presented new experimental data on <span>({{pi }^{ pm }})</span>, <span>({{K}^{ pm }})</span>, proton, and antiproton productions in central <sup>40</sup>Ar + <sup>45</sup>Sc collisions at the laboratory momenta <i>P</i><sub>lab</sub> = 13–150 A GeV/<i>c</i> and has compared these data with predictions of popular theoretical models. It turned out that the models poorly describe the data in the entire energy range. In this work, it has been suggested for the first time that nucleons participating in non-diffractive collisions cannot diffractively dissociate in subsequent nucleon–nucleon collisions. This idea has been implemented in the Geant4 FTF model. Good description of the data, including the first NICA BM@N data on <span>({{pi }^{ + }})</span> meson production in the collisions of <sup>40</sup>Ar nuclei with various nuclei at an energy of 3.2 A GeV, has been achieved.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"800 - 803"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603944.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994998","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
Quantum Entanglement at the Superradiance of a Condensate of Electron–Hole Pairs in Semiconductor Heterostructures 半导体异质结构中电子-空穴对凝聚体超辐射下的量子纠缠
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-20 DOI: 10.1134/S0021364024603348
P. P. Vasil’ev
{"title":"Quantum Entanglement at the Superradiance of a Condensate of Electron–Hole Pairs in Semiconductor Heterostructures","authors":"P. P. Vasil’ev","doi":"10.1134/S0021364024603348","DOIUrl":"10.1134/S0021364024603348","url":null,"abstract":"<p>The quantum properties of superradiant pulses generated at the radiative recombination of an electron–hole condensate in semiconductor heterostructures at room temperature have been studied using optical homodyne tomography. Signatures of the quantum entanglement of superradiant states, which are superpositions of two coherent states, have been revealed. It has been demonstrated that reconstructed Wigner functions under certain conditions are very similar to the Wigner functions of the Schrödinger cat states.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 11","pages":"867 - 872"},"PeriodicalIF":1.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603348.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994995","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
Influence of the Spin Hall Effect on the Resonance Frequency and Magnetic Susceptibility of a Magnonic Waveguide 自旋霍尔效应对磁波导谐振频率和磁化率的影响
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603622
O. S. Temnaya, S. A. Nikitov
{"title":"Influence of the Spin Hall Effect on the Resonance Frequency and Magnetic Susceptibility of a Magnonic Waveguide","authors":"O. S. Temnaya,&nbsp;S. A. Nikitov","doi":"10.1134/S0021364024603622","DOIUrl":"10.1134/S0021364024603622","url":null,"abstract":"<p>The effect of the variation of the spin current on the magnetic susceptibility of a magnonic waveguide in the form of a “ferromagnet–normal metal” heterostructure is investigated. Based on the Landau–Lifshitz–Gilbert model with the current term in the Slonczewski–Berger form, which describes the magnetization dynamics including the spin moment transfer, expressions are obtained for the real and imaginary parts of the magnetic susceptibility in the geometry of surface spin waves in the damping mode. The resulting model correctly approximates experimental data demonstrating an increase in the amplitude of spin waves propagating in a YIG/Pt heterostructure. It is shown that an increase in the spin current leads to an increase in the resonance frequency of spin waves and in the magnetic susceptibility tensor components in resonance. The results of this study can be used to design waveguides for spin waves with controllable losses and high-sensitivity magnetic field sensors.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"747 - 750"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603622.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940689","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
Electronic Raman Scattering Thermometry of Disordered Solids 无序固体的电子拉曼散射测温
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603737
E. I. Battalova, S. S. Kharintsev
{"title":"Electronic Raman Scattering Thermometry of Disordered Solids","authors":"E. I. Battalova,&nbsp;S. S. Kharintsev","doi":"10.1134/S0021364024603737","DOIUrl":"10.1134/S0021364024603737","url":null,"abstract":"<p>Dynamic disorder in metal halide perovskites is driven by thermal structural fluctuations of cross-linked octahedra leading to a broadband central peak in the low-frequency region of electronic Raman scattering spectrum. In this work, a temperature dependence of the Raman central peak in metal halide perovskite CsPbBr<sub>3</sub> is experimentally demonstrated. The results of this study hold promise for the development of edge-cutting remote temperature sensors.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"727 - 731"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941062","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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