JETP Letters最新文献_第2页

Properties of Central Regions of the Dark Matter Halos in the Model with a Bump in the Power Spectrum of Density Perturbations 密度扰动功率谱凸起模型中暗物质晕中心区的性质

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024601775

Yu. N. Eroshenko, V. N. Lukash, E. V. Mikheeva, S. V. Pilipenko, M. V. Tkachev

{"title":"Properties of Central Regions of the Dark Matter Halos in the Model with a Bump in the Power Spectrum of Density Perturbations","authors":"Yu. N. Eroshenko, V. N. Lukash, E. V. Mikheeva, S. V. Pilipenko, M. V. Tkachev","doi":"10.1134/s0021364024601775","DOIUrl":"https://doi.org/10.1134/s0021364024601775","url":null,"abstract":"A surprisingly large number of galaxies with masses of ~109–1010({{M}_{ odot }}) at redshifts of (z geqslant 9) are discovered with the James Webb Space Telescope. A possible explanation for the increase in the mass function can be the presence of a local maximum (bump) in the power spectrum of density perturbations on the corresponding scale. In this paper, it is shown that simultaneously with the growth of the mass function, galaxies from the bump region must have a higher density (compactness) compared to cosmological models without a bump. These more compact galaxies have been partially included in larger galaxies and have been subjected to tidal gravitational disruption. They have been less destructed than “ordinary” galaxies of the same mass, and some of them could survive to z = 0 and persist on the periphery of some galaxies. The formation and evolution of compact halos in a cube with a volume of (47 Mpc)3 with (1024)3 dark matter particles in the redshift range from 120 to 0 have been numerically simulated and observational implications of the presence of such galaxies in the current Universe have been discussed.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190801","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

Interrelation between Doping Dependencies of the Spin Susceptibility and Electronic Structure in Cuprates 铜氧化物中自旋感度的掺杂依赖性与电子结构之间的相互关系

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601945

V. I. Kuz’min, M. M. Korshunov, S. V. Nikolaev, T. M. Ovchinnikova, S. G. Ovchinnikov

引用次数: 0

Photoelectric Nature of Nanocomposite ZnO/CuO Antibacterial Activity 纳米复合氧化锌/氧化铜抗菌活性的光电性质

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601805

I. N. Saraeva, D. A. Zayarny, A. A. Nastulyavichus, E. R. Tolordava, E. V. Ulturgasheva, P. V. Krikunova, S. I. Kudryashov

{"title":"Photoelectric Nature of Nanocomposite ZnO/CuO Antibacterial Activity","authors":"I. N. Saraeva, D. A. Zayarny, A. A. Nastulyavichus, E. R. Tolordava, E. V. Ulturgasheva, P. V. Krikunova, S. I. Kudryashov","doi":"10.1134/s0021364024601805","DOIUrl":"https://doi.org/10.1134/s0021364024601805","url":null,"abstract":"We present the study of the antibacterial properties of ZnO/CuO films, activated by LED lamp light with an emission spectrum close to that of natural sunlight, on an example of antibiotic-resistant S. aureus bacterial culture. The antibacterial properties of films with photoinduced electroporation lead to the emergence of a potential difference between semiconductor n-type ZnO and p-type CuO nanoparticles with a local increase in field intensity to a value ( sim {kern 1pt} 1 times {{10}^{4}}) V/cm, sufficient for irreversible electroporation to occur. Exposure leads to a decrease in bacterial contamination from the value (8 times {{10}^{8}}) CFU/mL to 0. Raman spectra before and after exposure were analyzed by calculating spectral peak parameters corresponding to molecular vibrations in nucleic acids, cell membranes, and proteins. The disappearance or degradation of peaks illustrating vibrations of A, G in nucleic acids, disruption of the secondary structure of proteins and the appearance of disordered forms of amide I were detected, as well as the emerging disorder of lipid chains in the membrane and the destruction of N-acetylmuramic acid and N-acetylglucosamine, which are part of the gram-positive microorganisms’ cell membrane, therefore indicating the destruction of the cell wall and irreversible destruction of the internal structure of the cells.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190862","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

Features of the Response of Majorana Quasiparticles in Superconducting Wires (Brief Review) 超导线中马约拉纳准粒子的响应特征（简评）

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601192

S. V. Aksenov

引用次数: 0

“Branching Asymmetry” of the Coherent Population Trapping Resonance 相干群体陷波共振的 "分支不对称"

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601842

E. A. Tsygankov, D. S. Chuchelov, M. I. Vaskovskaya, S. A. Zibrov, V. V. Vassiliev, V. L. Velichansky

引用次数: 0

Crossover from Relativistic to Non-relativistic Net Magnetization for MnTe Altermagnet Candidate 锰碲超磁体候选材料从相对论净磁化到非相对论净磁化的跨越

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024602926

N. N. Orlova, A. A. Avakyants, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov

引用次数: 0

Measurement of Correlations in the Parametric Down Conversion Field Using Analog Detectors 使用模拟探测器测量参数下变频场中的相关性

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601982

D. A. Safronenkov, G. Kh. Kitaeva

引用次数: 0

Hong–Ou–Mandel Interference in Quantum Optics, Monogamy of Entanglement, Nonorthogonality, and Untrusted Nodes 量子光学中的洪欧-曼德尔干涉、纠缠的一元性、非正交性和不可信任的节点

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601994

S. P. Kulik, S. N. Molotkov

{"title":"Hong–Ou–Mandel Interference in Quantum Optics, Monogamy of Entanglement, Nonorthogonality, and Untrusted Nodes","authors":"S. P. Kulik, S. N. Molotkov","doi":"10.1134/s0021364024601994","DOIUrl":"https://doi.org/10.1134/s0021364024601994","url":null,"abstract":"Quantum key distribution systems with an untrusted intermediate node described by the so-called measurement device independent (MDI) protocol have been actively studied in the last decade. In early works, it was only argued why such a quantum key distribution system ensures the security of distributed keys mentioning that the security proof of the MDI protocol, which was not presented, is similar to that for the basic Bennett‒Brassard 84 (BB84) protocol. For this reason, despite the existing experimental implementations of the MDI quantum key distribution system, physical reasons for the protocol security are still questionable. Such quantum key distribution systems provide a common key between two network nodes connected through the intermediate untrusted node, which does not require protection of the equipment on it, and an eavesdropper sees the entire operation of the equipment, including the results of the operation of photodetectors. In this work, the MDI protocol has been analyzed. It has been shown that the physical reasons for the protocol security are based on fundamental properties such as the interference of photons from different sources, monogamy of entanglement, and nonorthogonality of states. A simple and explicit derivation is given showing the equivalence of the MDI and BB84 protocols and physical reasons for the identity of the corresponding expressions for the length of the final key.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190810","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

Phase-Sensitive Plasma Nonlinearity Controlled by Ultrashort Pulses 由超短脉冲控制的相位敏感等离子体非线性

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s0021364024601489

I. V. Savitsky, P. B. Glek, R. M. Aliev, E. A. Stepanov, A. A. Voronin, A. A. Lanin, A. B. Fedotov

引用次数: 0

Spinodal Decomposition of NbS3 Whiskers with Charge Density Waves 带有电荷密度波的 NbS3 晶须的自旋分解

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/s002136402460191x

V. P. Martovitskii, M. V. Nikitin, V. Ya. Pokrovskii

{"title":"Spinodal Decomposition of NbS3 Whiskers with Charge Density Waves","authors":"V. P. Martovitskii, M. V. Nikitin, V. Ya. Pokrovskii","doi":"10.1134/s002136402460191x","DOIUrl":"https://doi.org/10.1134/s002136402460191x","url":null,"abstract":"The grazing X-ray diffraction study of phase-II NbS3 whiskers with charge density waves has shown that they exhibit pairs of broadened reflections from two close phases with the monoclinic angles β1 and β2 instead of single ((h0l)) peaks. The phase with the smaller monoclinic angle β1 = 95.9°–97.2° is close in lattice parameters to phase I without charge density waves. Phase II with β2 = 99.9°–100.0° has a reduced b lattice parameter along the strongest bond, which implies an increased concentration of sulfur vacancies in this phase compared to phase I. It has been concluded that the studied whiskers have underwent a spinodal decomposition with the redistribution of sulfur vacancies resulting in the alternation of phases in the (001) direction perpendicular to the layers. A satellite structure indicating the formation of a superlattice with a period of 35.2 nm in this direction is observed in the most structurally perfect whisker of phase II. The spinodal decomposition is combined with high internal stresses present in whiskers with a monoclinic lattice. The partial spinodal decomposition is also observed in some phase-I whiskers without charge density waves with the appearance of thin layers of phase IV and phase II with the monoclinic angle β = 104°. The existence of thin layers of phase II in the bulk of phase I in such samples exposed to a high-frequency voltage has been confirmed by the presence of Shapiro steps on current–voltage characteristics. Spinodal decomposition should be taken into account to describe the properties of NbS3 whiskers nominally belonging to a certain polytype.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190814","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