Journal of Experimental and Theoretical Physics最新文献_第2页

Spin Pumping by a Moving Domain Wall at the Interface of an Antiferromagnetic Insulator and a Two-Dimensional Metal 反铁磁绝缘体和二维金属界面上移动域壁的自旋泵送

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120105

A. G. Mal’shukov

{"title":"Spin Pumping by a Moving Domain Wall at the Interface of an Antiferromagnetic Insulator and a Two-Dimensional Metal","authors":"A. G. Mal’shukov","doi":"10.1134/s1063776123120105","DOIUrl":"https://doi.org/10.1134/s1063776123120105","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A domain wall (DW) which moves parallel to a magnetically compensated interface between an antiferromagnetic insulator (AFMI) and a two-dimensional (2D) metal can pump spin polarization into the metal. It is assumed that localized spins of a collinear AFMI interact with itinerant electrons through their exchange interaction on the interface. We employed the Keldysh formalism of Green’s functions for electrons which experience potential and spin-orbit scattering on random impurities. This formalism allows a unified analysis of spin pumping, spin diffusion and spin relaxation effects on a 2D electron gas. It is shown that the pumping of a nonstaggered magnetization into the metal film takes place in the second order with respect to the interface exchange interaction. At sufficiently weak spin relaxation this pumping effect can be much stronger than the first-order effect of the Pauli magnetism which is produced by the small nonstaggered exchange field of the DW. It is shown that the pumped polarization is sensitive to the geometry of the electron’s Fermi surface and increases when the wave vector of the staggered magnetization approaches the nesting vector of the Fermi surface. In a disordered diffusive electron gas the induced spin polarization follows the motion of the domain wall. It is distributed asymmetrically around the DW over a distance which can be much larger than the DW width.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579297","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

Interatomic Interaction at the Al–TiC Interface 铝-钛-碳界面上的原子间相互作用

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120129

V. V. Reshetnyak, A. V. Aborkin, A. V. Filippov

引用次数: 0

“Dark” States As a Particular Case of the Emission Spectrum of an Exceptional Surface Wave "黑暗 "状态是异常表面波发射光谱的一种特殊情况

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120142

O. S. Sukhorukova, A. S. Tarasenko, S. V. Tarasenko, V. G. Shavrov

引用次数: 0

Thermoelectric Power and Hall Effect in Correlated Metals and Doped Mott–Hubbard Insulators: DMFT Approximation 相关金属和掺杂莫特-哈伯德绝缘体中的热电动力和霍尔效应：DMFT 近似值

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120087

E. Z. Kuchinskii, N. A. Kuleeva, M. V. Sadovskii

{"title":"Thermoelectric Power and Hall Effect in Correlated Metals and Doped Mott–Hubbard Insulators: DMFT Approximation","authors":"E. Z. Kuchinskii, N. A. Kuleeva, M. V. Sadovskii","doi":"10.1134/s1063776123120087","DOIUrl":"https://doi.org/10.1134/s1063776123120087","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present comparative theoretical investigation of thermoelectric power and Hall effect in the Hubbard model for correlated metal and Mott insulator (considered as prototype cuprate superconductor) for different concentrations of current carriers. Analysis is performed within standard DMFT approximation. For Mott insulator we consider the typical case of partial filling of the lower Hubbard band (hole doping). We calculate the dependence of thermopower on doping level and determine the critical concentration of carriers corresponding to sign change of thermopower. An anomalous dependence of thermopower on temperature is obtained significantly different from linear temperature dependence typical for the usual metals. The role of disorder scattering is analyzed on qualitative level. The comparison with similar studies of the Hall effect shows, that breaking of electron-hole symmetry leads to the appearance of the relatively large interval of band-fillings (close to the half-filling) where thermopower and Hall effects have different signs. We propose a certain scheme allowing to determine the number of carriers from ARPES data and perform semi-quantitative estimate of both thermopower and Hall coefficient using the usual DFT calculations of electronic spectrum.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579240","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

Universality of Nucleon–Nucleon Correlations in Nuclei and Cumulative Pion Production 核中核子-核子相关性的普遍性与累积负离子产生

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s106377612312021x

Yu. T. Kiselev

{"title":"Universality of Nucleon–Nucleon Correlations in Nuclei and Cumulative Pion Production","authors":"Yu. T. Kiselev","doi":"10.1134/s106377612312021x","DOIUrl":"https://doi.org/10.1134/s106377612312021x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The structure of nuclear matter at short internucleon distances is one of the poorly studied aspects of nuclear physics. At distances of the order of the nucleon radius, nuclear matter is represented by the pairs of correlated nucleons with relative momenta exceeding the Fermi momenta that emerge for a short time. Such structures, whose local density is comparable to the density of neutron stars, arise from fluctuations in the average nuclear density. One of the important characteristics of nucleon–nucleon correlations is their universality implying the independence of their properties from the nuclear mass number. Therefore, the peculiarities of these objects of nuclear structure reflect the properties of nuclear matter rather than specific nuclei. Information about the short-distance physics is extracted from the analysis of processes with high energy–momentum transfers. Until now, the property of universality has been observed in electron–nucleus collisions only for the breakup of nucleon pairs. In this paper we analyze the data on the cumulative production of pions by protons on a set of nuclear targets and for the first time have established the existence of universality of two-nucleon correlations in the production of π<sup>+</sup> and π<sup>–</sup> mesons. We have obtained evidence for the involvement of three-nucleon correlations in the production of pions beyond the kinematics of their production in interactions with two-nucleon objects.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579420","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

Improved Cosmological Bounds for Mixing Scenarios of Three Sterile Neutrino Generations 三代无菌中微子混合情景的改进宇宙学边界

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120051

M. N. Dubinin, D. M. Kazarkin

引用次数: 0

Growth Kinetics of 4He Quantum Crystals at a Temperature of 0.1–0.2 K 4He 量子晶体在 0.1-0.2 K 温度下的生长动力学

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110146

R. B. Gusev, V. L. Tsymbalenko

引用次数: 0

An Optical Analog for a Rotating Binary Bose—Einstein Condensate 旋转双玻色-爱因斯坦凝聚态的光学模拟物

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110092

V. P. Ruban

引用次数: 0

Zeeman Splitting of Excitons in GaAs/AlGaAs Quantum Wells in the Faraday Geometry 法拉第几何中 GaAs/AlGaAs 量子阱中激子的泽曼分裂

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110134

P. S. Grigoryev, M. A. Chukeev, V. A. Lovtcius, Yu. P. Efimov, S. A. Eliseev

{"title":"Zeeman Splitting of Excitons in GaAs/AlGaAs Quantum Wells in the Faraday Geometry","authors":"P. S. Grigoryev, M. A. Chukeev, V. A. Lovtcius, Yu. P. Efimov, S. A. Eliseev","doi":"10.1134/s1063776123110134","DOIUrl":"https://doi.org/10.1134/s1063776123110134","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Zeeman splitting in the GaAs/AlGaAs heterostructure is investigated experimentally. Numerical analysis performed for the wavefunctions of exciton states, which takes into account the bands of heavy holes, light holes, and the band split by the spin–orbit interaction, is the quantitative agreement with experimental data both for an exciton with a heavy hole and for that with a light hole. It is shown that for explaining the experimental values of the Zeeman splitting in the quantum well under investigation, it is necessary to take into account both the Coulomb interaction and the contribution from the three bands in the valence band. The effect of screening of exciton states by a 2D gas of electrons with concentration <i>n</i> ≈ 10<sup>9</sup> cm<sup>–2</sup> is described. Numerical calculations are performed for a large range of quantum well widths and aluminum concentrations in barriers; the chart of the dependence of the effective <i>g</i> factor on these parameters is plotted for magnetic field <i>B</i> = 5 T.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462224","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

Active Brownian Motion of Dust Particles in Quasi-One-Dimensional (Chain) Structures in a Glow Discharge 辉光放电中准一维（链）结构中尘埃粒子的主动布朗运动

IF 1.1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/s106377612311016x

A. S. Svetlov, E. A. Kononov, F. M. Trukhachev, M. M. Vasiliev, O. F. Petrov

{"title":"Active Brownian Motion of Dust Particles in Quasi-One-Dimensional (Chain) Structures in a Glow Discharge","authors":"A. S. Svetlov, E. A. Kononov, F. M. Trukhachev, M. M. Vasiliev, O. F. Petrov","doi":"10.1134/s106377612311016x","DOIUrl":"https://doi.org/10.1134/s106377612311016x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present the experimental results of our study of the formation and dynamics of chain structures by active Brownian particles in a DC glow discharge. The mechanism of active particle motion is associated with the conversion of laser radiation by particles into the energy of their own (nonthermal) motion. Through our analysis of the motion parameters (the trajectories, the root-mean-square displacement, the kinetic energy) as a function of the intensity of laser radiation incident on the particles, we have shown that the particles are active Brownian ones. It is possible to control their motion without changing the discharge parameters. It has been experimentally found that the formation of chain structures and their stable state are not violated under kinetic heating of the particles as their kinetic energy increases by more than an order of magnitude. This suggests the realization of a mechanism for the formation of chains with a strong coupling between the particles that is not explained by the simple (ion) wake behind the upstream particle.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462254","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