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Reduced Characterization of Tunable Linear Photonic Integrated Circuits 降低可调谐线性光子集成电路的表征能力
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601477
L. V. Biguaa, K. G. Katamadzhe, B. I. Bantysh, Yu. I. Bogdanov
{"title":"Reduced Characterization of Tunable Linear Photonic Integrated Circuits","authors":"L. V. Biguaa,&nbsp;K. G. Katamadzhe,&nbsp;B. I. Bantysh,&nbsp;Yu. I. Bogdanov","doi":"10.1134/S0021364024601477","DOIUrl":"10.1134/S0021364024601477","url":null,"abstract":"<p>Tunable linear photonic circuits are important elements in both classical and quantum information technologies. The scaling of such circuits is possible only in the integrated form, which complicates their characterization because of the impossibility of the reconstruction of each element individually. The existing methods of characterization of linear photonic circuits require multiple changes in the phases of transfer matrix elements at various values of control parameters, which provides significant experimental difficulties. In this work, a new approach is proposed: it is demonstrated that the measurement of only transmission coefficients for certain values of the control parameters of the photonic circuit allows the development of a mathematical model that can predicts transmission coefficients for arbitrary values of the parameters. This method has been successfully approved in a numerical experiment for a tunable four-channel interferometer implementing an arbitrary unitary transformation. The proposed method provides new possibilities to efficiently characterize and design tunable linear photonic circuits.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"966 - 971"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945238","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
Masses of the u, d, and s Quarks u 夸克、d 夸克和 s 夸克的质量
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601544
A. A. Osipov
{"title":"Masses of the u, d, and s Quarks","authors":"A. A. Osipov","doi":"10.1134/S0021364024601544","DOIUrl":"10.1134/S0021364024601544","url":null,"abstract":"<p>Ratios <i>m</i><sub><i>s</i></sub>/<i>m</i><sub><i>d</i></sub> and <i>m</i><sub><i>u</i></sub>/<i>m</i><sub><i>d</i></sub> of the light quark masses have been determined from expressions for squared masses of pseudoscalar mesons <span>(m_{pi }^{2})</span> and <span>(m_{K}^{2})</span> obtained with an accuracy of the second order in chiral symmetry breaking. The fit of the theoretical expressions for <span>(m_{pi }^{2})</span> and <span>(m_{K}^{2})</span> to their phenomenological values leads to a functional relation between the ratios <i>m</i><sub><i>s</i></sub>/<i>m</i><sub><i>d</i></sub> and <i>m</i><sub><i>u</i></sub>/<i>m</i><sub><i>d</i></sub>, which is described by a third-order curve. The application of the lattice calculation result <i>m</i><sub><i>s</i></sub>/<i>m</i><sub><i>ud</i></sub> = 27.23(10), where <i>m</i><sub><i>ud</i></sub> = (<i>m</i><sub><i>u</i></sub> + <i>m</i><sub><i>d</i></sub>)/2, reported by the flavor lattice averaging group (FLAG) for the case of four quark flavors provides an additional constraint, which significantly reduces the error (~2%) for the ratio <i>m</i><sub><i>u</i></sub>/<i>m</i><sub><i>d</i></sub> = 0.455(8). The absolute values of the quark masses have been then obtained.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"897 - 902"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601544.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945212","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
New Polytype of NbS3 Whiskers: from Simple to Complex 新型多晶体 NbS3 晶须：从简单到复杂
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601702
A. L. Vasiliev, A. G. Ivanova, I. N. Trun’kin, N. B. Bolotina, V. Ya. Pokrovskii, S. G. Zybtsev
{"title":"New Polytype of NbS3 Whiskers: from Simple to Complex","authors":"A. L. Vasiliev,&nbsp;A. G. Ivanova,&nbsp;I. N. Trun’kin,&nbsp;N. B. Bolotina,&nbsp;V. Ya. Pokrovskii,&nbsp;S. G. Zybtsev","doi":"10.1134/S0021364024601702","DOIUrl":"10.1134/S0021364024601702","url":null,"abstract":"<p>Three samples of a quasi-one-dimensional conductor NbS<sub>3</sub> from the same growth batch are studied at room temperature by transmission electron microscopy. Less defective sample no. 1 and more defective sample no. 2 have been identified as known polytypes. Sample no. 3 is an unknown polytype with the lattice parameter <i>c</i> larger than that in all known polytypes. Electron diffraction patterns of the new polytype demonstrate four systems of satellite reflections, which indicates the formation of four charge density waves in the sample. The possibility of the formation of polytypes with a more complex structure is discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"942 - 949"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945218","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
Influence of Nuclear Quantum Effects on the Vibrational Spectrum and Structure of H2O@C60 Endofullerene 核量子效应对 H2O@C60 内富勒烯振动光谱和结构的影响
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601325
D. O. Potapov, N. D. Kondratyuk
{"title":"Influence of Nuclear Quantum Effects on the Vibrational Spectrum and Structure of H2O@C60 Endofullerene","authors":"D. O. Potapov,&nbsp;N. D. Kondratyuk","doi":"10.1134/S0021364024601325","DOIUrl":"10.1134/S0021364024601325","url":null,"abstract":"<p>The structural and dynamic properties of a water molecule undergo changes if it is located inside a fullerene (H<sub>2</sub>O@C<sub>60</sub>). In this work, the atomistic simulation method including nuclear quantum effects is used for the first time to describe the low-temperature dynamics and changes in the structure of the water molecule in the fullerene at 5 K. A machine-learning potential on density functional theory trajectories is used to calculate the interactions in this system. Zero-point energy and delocalization of nuclei are taken into account using path integral molecular dynamics.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"923 - 928"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945215","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
Metastable Objects in the Universe and Their Possible Relation to “the Arrow of Time” 宇宙中的可陨落物体及其与 "时间之箭 "的可能关系
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601301
V. V. Brazhkin
{"title":"Metastable Objects in the Universe and Their Possible Relation to “the Arrow of Time”","authors":"V. V. Brazhkin","doi":"10.1134/S0021364024601301","DOIUrl":"10.1134/S0021364024601301","url":null,"abstract":"<p>A relation of the presence of metastable objects with various “lifetimes” in the Universe to both an increase in the entropy and “the arrow of time” is discussed. A finite lifetime of metastable objects makes it possible to assign many of them with their own “local clocks.” The decay of any metastable system in the Universe results in the appearance of more stable objects with the emission of photons and other particles. These photons and particles interact with particles of more stable subsystems in the Universe, leading to their ergodicity. The emission of photons from decaying metastable states in the expanding Universe makes these processes irreversible and specifies the arrow of time although the equations describing these physical processes are reversible.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"972 - 976"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945227","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
Localized Superconductivity in LaB6 Hexaboride with Dynamic Charge Stripes 具有动态电荷条纹的六硼化铅局部超导性
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601696
A. N. Azarevich, A. V. Bogach, O. N. Khrykina, N. B. Bolotina, V. M. Gridchina, N. Yu. Shitsevalova, S. Yu. Gavrilkin, A. Yu. Tsvetkov, S. Gabáni, K. Flachbart, A. V. Kuznetsov, N. E. Sluchanko
{"title":"Localized Superconductivity in LaB6 Hexaboride with Dynamic Charge Stripes","authors":"A. N. Azarevich,&nbsp;A. V. Bogach,&nbsp;O. N. Khrykina,&nbsp;N. B. Bolotina,&nbsp;V. M. Gridchina,&nbsp;N. Yu. Shitsevalova,&nbsp;S. Yu. Gavrilkin,&nbsp;A. Yu. Tsvetkov,&nbsp;S. Gabáni,&nbsp;K. Flachbart,&nbsp;A. V. Kuznetsov,&nbsp;N. E. Sluchanko","doi":"10.1134/S0021364024601696","DOIUrl":"10.1134/S0021364024601696","url":null,"abstract":"<p>Type II superconductivity with <i>T</i><sub>c</sub> ∼ 6 K is discovered in LaB<sub>6</sub>. The critical fields are determined and the estimates for the coherence length ξ(0) ∼ 240 Å, the Ginzburg−Landau parameter κ<sub>GL</sub> ∼ 2, and the electron–phonon coupling constant λ<sub><i>e</i>−<i>ph</i></sub> ≈ 0.75 are obtained. Precision X-ray diffraction studies at <i>T</i> = 30 K reveal three-dimensional charge-stripe structures in LaB<sub>6</sub>. The scenario of superconductivity localized near filamentary channels with a fluctuating electron density arising in the lanthanum hexaboride matrix is discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"934 - 941"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601696.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945216","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
Modified Bridgman Formula for the Thermal Conductivity of Complex (Dusty) Plasma Fluids 复杂（多尘）等离子流体导热率的修正布里奇曼公式
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024602628
S. A. Khrapak, A. G. Khrapak
{"title":"Modified Bridgman Formula for the Thermal Conductivity of Complex (Dusty) Plasma Fluids","authors":"S. A. Khrapak,&nbsp;A. G. Khrapak","doi":"10.1134/S0021364024602628","DOIUrl":"10.1134/S0021364024602628","url":null,"abstract":"<p>A simple and popular Bridgman’s formula predicts a linear correlation between the thermal conductivity coefficient and the sound velocity of dense liquids. Unfortunately, it cannot be applied to strongly coupled plasma-related fluids with screened Coulomb interactions, because the sound velocity can greatly increase as screening weakens. We propose a modification of the Bridgman formula by correlating the thermal conductivity coefficient with the transverse (shear) sound velocity. This approach is demonstrated to work reasonably well in screened Coulomb (Yukawa) fluids and can be useful in the context of complex (dusty) plasmas.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 4","pages":"236 - 240"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945221","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
Erratum to: Multliple-Gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide 勘误：非磁性 Stoichiometric CaKFe4As4 Pnictide 的多间隙超导性
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024120014
T. E. Kuzmicheva, S. A. Kuzmichev, A. S. Medvedev
{"title":"Erratum to: Multliple-Gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide","authors":"T. E. Kuzmicheva,&nbsp;S. A. Kuzmichev,&nbsp;A. S. Medvedev","doi":"10.1134/S0021364024120014","DOIUrl":"10.1134/S0021364024120014","url":null,"abstract":"","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"977 - 977"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409233","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
Microwave Photoconductivity of Gapless Dirac Fermions in HgTe Quantum Wells 碲镉汞量子阱中无间隙狄拉克费米子的微波光电导性
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-11 DOI: 10.1134/S0021364024601131
N. S. Kuzmin, A. S. Jaroshevich, L. S. Braginskii, M. V. Entin, Z. D. Kvon, N. N. Mikhailov
{"title":"Microwave Photoconductivity of Gapless Dirac Fermions in HgTe Quantum Wells","authors":"N. S. Kuzmin,&nbsp;A. S. Jaroshevich,&nbsp;L. S. Braginskii,&nbsp;M. V. Entin,&nbsp;Z. D. Kvon,&nbsp;N. N. Mikhailov","doi":"10.1134/S0021364024601131","DOIUrl":"10.1134/S0021364024601131","url":null,"abstract":"<p>The microwave photoconductivity of a system of gapless Dirac fermions in HgTe quantum wells with a critical thickness has been experimentally and theoretically investigated. It has been found that the photoconductivity fluctuates depending on the gate voltage near the Dirac point, and the fluctuation amplitude increases with an increase in the conductor size and a decrease in temperature. A theoretical explanation of the microwave response based on the assumption of the existence of a percolation two-dimensional fractal network of helical edge current states induced by fluctuations in the well thickness near the critical value has been proposed. It has been shown that the microwave photoconductivity of this network fluctuates with a change in the Fermi energy and the behavior of the fluctuation amplitude is in qualitative agreement with the corresponding experimental data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"119 12","pages":"950 - 956"},"PeriodicalIF":1.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601131.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945219","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
Upper Limit for the Superconducting Transition Temperature in Eliashberg–McMillan Theory 埃利亚斯伯格-麦克米伦理论中超导转变温度的上限
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-07-29 DOI: 10.1134/S0021364024602409
M. V. Sadovskii
{"title":"Upper Limit for the Superconducting Transition Temperature in Eliashberg–McMillan Theory","authors":"M. V. Sadovskii","doi":"10.1134/S0021364024602409","DOIUrl":"10.1134/S0021364024602409","url":null,"abstract":"<p>We present simple qualitative estimates for the maximal superconducting transition temperature, which may be achieved due to electron–phonon coupling in Eliashberg–McMillan theory. It is shown that in the limit of very strong coupling the upper limit for transition temperature is determined in fact by a combination of atomic constants and density of conduction electrons.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 3","pages":"205 - 207"},"PeriodicalIF":1.4,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024602409.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866157","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
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