发布求助
文献互助 智能选刊 最新文献

JETP Letters最新文献

筛选
英文 中文
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
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
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
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
Generation and Absorption of Photons by a Two-Level Atom Ultrastrongly Coupled to an Electromagnetic Field 双能级原子与电磁场的超强耦合对光子的产生和吸收
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024604020
A. V. Kozlovskii
{"title":"Generation and Absorption of Photons by a Two-Level Atom Ultrastrongly Coupled to an Electromagnetic Field","authors":"A. V. Kozlovskii","doi":"10.1134/S0021364024604020","DOIUrl":"10.1134/S0021364024604020","url":null,"abstract":"<p>Within the Rabi quantum model, it has been shown theoretically that a two-level atom ultrastrongly coupled to an electromagnetic field generates or absorbs photons. Photons can be generated if the field is initially in the vacuum state. Under certain initial states of the atom + field system, the absorption of photons is possible in the field mode in the ultrastrong atom–field coupling regime. If the atom is initially in the ground (unexcited) state and the field is in the vacuum state, photons can be generated under resonance condition ω<sub>a</sub> ≈ ω<sub>f</sub> or ξ ≡ ω<sub>a</sub>/ω<sub>f</sub> ≈ 1, where ω<sub>a</sub> and ω<sub>f</sub> are the atomic transition and field frequencies, respectively, in the ultrastrong coupling regime. At the negative detuning when ξ <span>( ll )</span> 1 or ω<sub>a</sub> <span>( ll )</span> ω<sub>f</sub>, Rabi oscillations of the average number of photons <span>({{langle hat {n}rangle }_{t}})</span> with <span>(0 leqslant {{langle hat {n}rangle }_{t}} leqslant {{n}_{{max }}} gg 1)</span> are observed in the case of the ultrastrong coupling with the atom–field coupling constant <span>(tilde {g} equiv {text{|}}g{text{|/}}{{omega }_{{text{f}}}} sim 1)</span>; in this case, the population of the excited atomic state is <i>P</i><sub>e</sub>(<i>t</i>) ≈ 0.5. At a large positive detuning when ξ <span>( gg )</span> 1, photons are not generated, i.e., <span>(langle hat {n}rangle approx 0)</span>, and the atom remains in the initial state, i.e., <i>P</i><sub>e</sub>(<i>t</i>) ≈ 0. The statistics of photons in the generation regime is nearly chaotic: the variance of photons is much larger than the level of the coherent field state (i.e., is super-Poisson). Field photons are absorbed without the excitation of the atom in the ultrastrong coupling regime in the case of the coherent initial state of the field <span>((langle hat {n}(t = 0rangle &gt; 0))</span> for certain positive detuning values. In this case, the field becomes sub-Poisson.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"720 - 726"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604020.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940688","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
Small-Scale Light Structures in a Kerr Medium 克尔介质中的小尺度光结构
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603646
V. P. Ruban
{"title":"Small-Scale Light Structures in a Kerr Medium","authors":"V. P. Ruban","doi":"10.1134/S0021364024603646","DOIUrl":"10.1134/S0021364024603646","url":null,"abstract":"<p>A system of equations has been proposed for a monochromatic weakly nonlinear light wave in a Kerr medium. This system is equivalent up to the third order in electric field to the known equation <span>({kern 1pt} {text{curl}},{text{curl}}{mathbf{E}} = k_{0}^{2}[{mathbf{E}} + alpha {text{|}}{mathbf{E}}{{{text{|}}}^{2}}{mathbf{E}} + beta ({mathbf{E}} cdot {mathbf{E}}){mathbf{E}}{text{*}}])</span>, but the new equations are much more convenient for numerical computation. Optical fields with small structures of two or three wavelengths have been simulated using this system. It has been found that a stable self-focused light beam (a two-dimensional vector soliton) in some parametric domain is possible even without modification of nonlinearity. “Inelastic” collisions between two such narrow beams with opposite circular polarizations have been calculated. Furthermore, examples of interacting optical vortices, spatial separation of the circular polarizations, and the Kelvin–Helmholtz instability have been given for defocusing nonlinearity.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"713 - 719"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603646.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940690","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
Anomalous Behavior of Long-Wavelength Optical Phonons in a Relaxor Ferroelectric PbNi1/3Nb2/3O3 铁电弛豫器PbNi1/3Nb2/3O3中长波长光学声子的反常行为
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603300
N. K. Derets, A. I. Fedoseev, T. A. Smirnova, J.-H. Ko, S. G. Lushnikov
{"title":"Anomalous Behavior of Long-Wavelength Optical Phonons in a Relaxor Ferroelectric PbNi1/3Nb2/3O3","authors":"N. K. Derets,&nbsp;A. I. Fedoseev,&nbsp;T. A. Smirnova,&nbsp;J.-H. Ko,&nbsp;S. G. Lushnikov","doi":"10.1134/S0021364024603300","DOIUrl":"10.1134/S0021364024603300","url":null,"abstract":"<p>The paper presents the results of studying the vibrational spectrum of the PbNi<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> (PNN) crystal using Raman scattering in the temperature range from 100 to 650 K, including the region of the “diffuse phase transition” with a maximum permittivity at <span>({{T}_{m}} = 150{kern 1pt} )</span> K at a frequency of 10 kHz. Polarized light scattering spectra in PNN are similar to those observed in a number of studied relaxor ferroelectrics with a perovskite structure <span>(AB{kern 1pt} '{kern 1pt} B{kern 1pt} ''{kern 1pt} {{O}_{3}})</span>. Analysis of the temperature evolution of phonon modes allowed us to identify special points in the dynamics of the PNN crystal lattice at <span>({{T}_{1}} = 280{kern 1pt} )</span> K and <span>({{T}_{m}} = 150{kern 1pt} )</span> K. It is shown that anomalies in the temperature behavior of optical phonons in the vicinity of <span>({{T}_{1}})</span> can be associated with the dynamics of polar nanoregions, the nature of which changes from dynamic to static. In the studied temperature range, a sequence of phase transformations is proposed for PNN crystals.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"741 - 746"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603300.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941063","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
Excess Entropy of Metallic Glasses and Its Relation to the Glass-Forming Ability of Maternal Melts 金属玻璃的超熵及其与母熔体玻璃形成能力的关系
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024602975
A. S. Makarov, R. A. Konchakov, G. V. Afonin, J. C. Qiao, N. P. Kobelev, V. A. Khonik
{"title":"Excess Entropy of Metallic Glasses and Its Relation to the Glass-Forming Ability of Maternal Melts","authors":"A. S. Makarov,&nbsp;R. A. Konchakov,&nbsp;G. V. Afonin,&nbsp;J. C. Qiao,&nbsp;N. P. Kobelev,&nbsp;V. A. Khonik","doi":"10.1134/S0021364024602975","DOIUrl":"10.1134/S0021364024602975","url":null,"abstract":"<p>The excess entropy Δ<i>S</i> with respect to the maternal crystal state has been determined from calorimetric data for 30 metallic glasses. It has been shown that the excess entropy in the supercooled liquid state Δ<i>S</i><sub>sql</sub> is a universal characteristic of a glass independent of its thermal treatment. Six parameters often used to estimate the glass-forming ability of supercooled melts have been calculated for the same metallic glasses. It has been shown that all six parameters increase with Δ<i>S</i><sub>sql</sub> and the glass-forming ability of supercooled melts increases with their structural disorder. A possible mechanism to implement this relation has been discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"759 - 765"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024602975.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941064","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信