Journal of Experimental and Theoretical Physics最新文献

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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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120105

A. G. Mal’shukov

Abstract

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.

摘要与反铁磁绝缘体（AFMI）和二维金属之间的磁补偿界面平行移动的畴壁（DW）可以将自旋极化泵入金属。假设平行反铁磁绝缘体的局部自旋与巡回电子在界面上通过交换相互作用而相互作用。对于在随机杂质上经历电势和自旋轨道散射的电子，我们采用了格林函数的凯尔迪什形式主义。这种形式主义可以对二维电子气的自旋泵、自旋扩散和自旋弛豫效应进行统一分析。研究表明，非交错磁化泵入金属膜的过程与界面交换相互作用有关，为二阶。在自旋弛豫足够弱的情况下，这种泵浦效应可能比保利磁性的一阶效应强得多，而保利磁性是由 DW 的小非交错交换场产生的。研究表明，泵浦极化对电子费米面的几何形状很敏感，当交错磁化的波矢量接近费米面的嵌套矢量时，泵浦极化就会增加。在无序扩散电子气中，诱导自旋极化会跟随畴壁运动。自旋极化在畴壁周围不对称地分布，其距离可能比畴壁宽度大得多。

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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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120129

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

Abstract

The interaction of a titanium carbide nanoparticle with aluminum (100), (110), and (111) substrates is investigated within the density functional theory. The nanoparticle–substrate interaction energies are determined; the electron density distribution and the electron localization function between aluminum, titanium, and carbon atoms are analyzed. It has been established that the atoms in the upper layers of the aluminum (100) and (110) substrates are significantly displaced relative to their initial positions as a result of the interaction with the nanoparticle, whereas a minor displacement of atoms is typical for the (111) substrate. The interaction between aluminum and carbon atoms at the Al–TiC interface is due to the formation of covalent Al–C chemical bonds. The aluminum atoms forming carbide bonds do not form chemical bonds with titanium atoms. The aluminum atoms that are adjacent to the titanium atoms and are not involved in the formation of carbide bonds form metallic Al–Ti bonds.

摘要利用密度泛函理论研究了碳化钛纳米粒子与铝（100）、（110）和（111）基底的相互作用。确定了纳米粒子与基底的相互作用能量；分析了铝、钛和碳原子之间的电子密度分布和电子定位功能。结果表明，由于与纳米粒子的相互作用，铝（100）和（110）基底上层的原子相对于其初始位置发生了明显的位移，而（111）基底的原子位移通常较小。铝-碳化钛界面上铝原子和碳原子之间的相互作用是由于形成了共价的铝-碳化学键。形成碳化物键的铝原子不会与钛原子形成化学键。与钛原子相邻且不参与形成碳化物键的铝原子则形成金属铝钛键。

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 Q3 Physics and Astronomy

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

Abstract

Under conditions of total internal reflection (TIR) of a plane bulk electromagnetic wave incident from outside on the surface of an optically transparent layered structure, the case where the numerator and denominator of the input surface wave impedance turn simultaneously to zero may correspond to the formation of a “dark” state. This is related to the occurrence of a point of degeneracy of the spectra of leaking exceptional surface waves (ESWs) of the first and second kind against the background of the continuous spectrum of radiative modes. For these waves, the instantaneous energy flux through the interface with a semibounded optical denser medium in an open radiative channel is zero at any instant. When approaching the point of dark state occurrence, the local maxima of the effects of first-order nonspecular reflection, accompanying resonant excitation of leaky ESWs, unlimitedly increase.

摘要在从外部入射到光学透明层状结构表面的平面体电磁波发生全内反射（TIR）的条件下，输入表面波阻抗的分子和分母同时变为零的情况可能对应于 "暗 "状态的形成。这与在辐射模式连续谱的背景下，第一类和第二类特殊表面波（ESW）的泄漏谱出现退化点有关。对于这些波，在开放辐射通道中通过与半圆形光学致密介质界面的瞬时能量通量在任何瞬间都为零。当接近暗态发生点时，伴随着泄漏 ESW 的共振激发，一阶非镜面反射效应的局部最大值无限增大。

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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120087

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

Abstract

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.

摘要我们对相关金属和莫特绝缘体（被视为原型铜氧化物超导体）的哈伯德模型中不同载流子浓度下的热电功率和霍尔效应进行了比较理论研究。分析是在标准 DMFT 近似条件下进行的。对于莫特绝缘体，我们考虑了部分填充下哈伯带（空穴掺杂）的典型情况。我们计算了热功率与掺杂水平的关系，并确定了与热功率符号变化相对应的载流子临界浓度。得出的热功率对温度的反常依赖性明显不同于一般金属的典型线性温度依赖性。对无序散射的作用进行了定性分析。与霍尔效应的类似研究进行比较后发现，电子-空穴对称性的破坏导致出现相对较大的带填充区间（接近半填充），在此区间内，热功率和霍尔效应具有不同的符号。我们提出了一种特定的方案，可以通过 ARPES 数据确定载流子的数量，并利用电子频谱的常规 DFT 计算对热功率和霍尔系数进行半定量估算。

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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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s106377612312021x

Yu. T. Kiselev

Abstract

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⁺ and π^– 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.

摘要核子间短距离的核物质结构是核物理中研究较少的方面之一。在核子半径数量级的距离上，核物质表现为短时间内出现的相对矩超过费米矩的相关核子对。这种结构的局部密度与中子星的密度相当，它产生于平均核密度的波动。核子-核子相关性的一个重要特征是其普遍性，这意味着其特性与核质量数无关。因此，这些核结构对象的特殊性反映的是核物质的特性，而不是特定的原子核。有关短距离物理学的信息是从对高能量-动量传递过程的分析中提取的。迄今为止，在电子-核碰撞中只观察到核子对破裂时的普遍性。在本文中，我们分析了一组核靶子上质子累积产生质子的数据，并首次证实了在π+ 和π- 介子的产生过程中存在双核关联的普遍性。我们还获得了三核子相关性参与质子产生的证据，这超出了质子在与二核子物体相互作用中产生的运动学范畴。

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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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120051

M. N. Dubinin, D. M. Kazarkin

Abstract

The gauge SU(2)_L × U(1) model with the extension of the lepton sector by three right-handed Majorana sterile neutrinos is considered. The complete mass matrix of 6 × 6 active and sterile neutrinos is diagonalized. The cosmological bounds following from the lifetime of sterile neutrinos and the fraction of energy carried by sterile neutrino dark matter are obtained. The deviations from the “fine-tuned” mixing scenario sensitive to the mass of the lightest standard (active) neutrino are considered, and the regions of the model parameter space corresponding to these deviations are distinguished.

摘要本文研究了轨则 SU(2)L × U(1) 模型，该模型的轻子部门由三个右旋马约拉纳不育中微子扩展而成。6×6有源中微子和无源中微子的完整质量矩阵被对角化。根据不育中微子的寿命和不育中微子暗物质携带的能量部分，得到了宇宙学边界。考虑了对最轻标准（有源）中微子质量敏感的 "微调 "混合方案的偏差，并区分了与这些偏差相对应的模型参数空间区域。

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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110146

R. B. Gusev, V. L. Tsymbalenko

Abstract

The growth kinetics of ⁴He crystals nucleated in a metastable liquid at a supersaturation of up to 10mbar is studied in the temperature range 90–180 mK. An optical dilution cryostat is used to observe and film crystal growth. The boundary supersaturation separating the normal (slow) and abnormal (fast) growth regions is determined. The growth rate of crystal facets in the normal growth mode is measured. The kinetics of fast crystal growth is investigated as a function of supersaturation and temperature.

摘要在 90-180 mK 的温度范围内，研究了在过饱和度高达 10mbar 的稳定液体中成核的 4He 晶体的生长动力学。使用光学稀释低温恒温器观察晶体生长并将其制成薄膜。确定了分隔正常（慢速）和异常（快速）生长区域的边界过饱和度。测量正常生长模式下晶体面的生长速率。研究了快速晶体生长动力学与过饱和度和温度的函数关系。

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 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-12 DOI: 10.1134/s1063776123110092

V. P. Ruban

Abstract

Coupled nonlinear Schrödinger equations for paraxial optics with two circular polarizations of light in a defocusing Kerr medium with anomalous dispersion coincide in form with the Gross–Pitaevskii equations for a binary Bose—Einstein condensate (BEC) of cold atoms in the phase separation regime. In this case, the helical symmetry of an optical waveguide corresponds to rotation of the transverse potential confining the BEC. The “centrifugal force” considerably affects the propagation of a light wave in such a system. Numerical experiments for a waveguide with an elliptical cross section have revealed characteristic structures consisting of quantized vortices and domain walls between two polarizations, which have not been observed earlier in optics.

摘要在具有反常色散的离焦克尔介质中，具有两个圆偏振光的准轴向光学耦合非线性薛定谔方程，在形式上与冷原子的二元玻色-爱因斯坦凝聚态（BEC）的格罗斯-皮塔耶夫斯基方程相吻合。在这种情况下，光波导的螺旋对称性对应于限制 BEC 的横向势能的旋转。离心力 "极大地影响了光波在这种系统中的传播。对具有椭圆截面的波导进行的数值实验揭示了由量子化涡旋和两个极化之间的畴墙组成的特征结构，这在光学领域是前所未有的。

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 Q3 Physics and Astronomy

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

Abstract

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 n ≈ 10⁹ cm^–2 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 g factor on these parameters is plotted for magnetic field B = 5 T.

摘要对 GaAs/AlGaAs 异质结构中的泽曼分裂进行了实验研究。对激子态波函数进行的数值分析考虑了重空穴带、轻空穴带以及自旋轨道相互作用产生的分裂带，结果表明重空穴激子和轻空穴激子的波函数与实验数据定量一致。研究表明，要解释所研究量子阱中泽曼分裂的实验值，必须同时考虑库仑相互作用和价带中三个带的贡献。本文描述了电子浓度 n≈109 cm-2 的二维气体对激子态的屏蔽效应。针对量子阱宽度和势垒中铝浓度的较大范围进行了数值计算；绘制了磁场 B = 5 T 时有效 g 因子与这些参数的关系图。

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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 Q3 Physics and Astronomy

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

Abstract

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.

摘要我们展示了直流辉光放电中活性布朗粒子链结构的形成和动力学研究的实验结果。主动粒子运动的机制与粒子将激光辐射转化为自身（非热）运动的能量有关。通过分析运动参数（轨迹、均方根位移、动能）与入射到粒子上的激光辐射强度的函数关系，我们证明粒子是活跃的布朗粒子。我们可以在不改变放电参数的情况下控制粒子的运动。实验发现，当粒子的动能增加一个数量级以上时，在粒子动能加热的情况下，链结构的形成及其稳定状态不会受到破坏。这表明，粒子之间的强耦合是形成链的机制，而上游粒子后面的简单（离子）唤醒无法解释这一点。

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