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Magnetoresistance and Symmetry of a Two-Dimensional Electron Gas in AlGaN/AlN/GaN Heterostructures AlGaN/AlN/GaN 异质结构中二维电子气体的磁阻和对称性
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600769
N. K. Chumakov, A. A. Andreev, I. V. Belov, A. B. Davydov, I. S. Ezubchenko, L. L. Lev, L. A. Morgun, S. N. Nikolaev, I. A. Chernykh, S. Yu. Shabanov, V. N. Strocov, V. G. Valeyev
{"title":"Magnetoresistance and Symmetry of a Two-Dimensional Electron Gas in AlGaN/AlN/GaN Heterostructures","authors":"N. K. Chumakov, A. A. Andreev, I. V. Belov, A. B. Davydov, I. S. Ezubchenko, L. L. Lev, L. A. Morgun, S. N. Nikolaev, I. A. Chernykh, S. Yu. Shabanov, V. N. Strocov, V. G. Valeyev","doi":"10.1134/s0021364024600769","DOIUrl":"https://doi.org/10.1134/s0021364024600769","url":null,"abstract":"<p>The physical characteristics of a two-dimensional electron gas located in the GaN layer near the AlN/GaN interface of AlGaN/AlN/GaN heterostructures have been studied for decades. According to the currently accepted concepts, its symmetry coincides with that of the nonsymmorphic space group <i>C</i><span>(_{{6{v}}}^{4})</span> in the bulk of GaN. However, this is incorrect. Indeed, the only nonsymmorphic element of this group—the rotation of the system about the [0001] axis normal to the interface plane, with a simultaneous shift along this axis by half a period of the GaN crystal lattice—is forbidden for a two-dimensional gas owing to the confinement potential, which, therefore, reduces its symmetry to the symmetry of the trigonal point group <i>C</i><span>(_{{3{v}}})</span>. This fact has been confirmed in this work by ab initio density functional calculations and by electrophysical data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255032","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 Lipid Conformations on the Interaction Energy between a Membrane and a Peripheral Protein 脂质构象对膜与外周蛋白相互作用能量的影响
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600460
P. E. Volynsky, A. S. Alekseeva, I. A. Boldyrev
{"title":"Influence of Lipid Conformations on the Interaction Energy between a Membrane and a Peripheral Protein","authors":"P. E. Volynsky, A. S. Alekseeva, I. A. Boldyrev","doi":"10.1134/s0021364024600460","DOIUrl":"https://doi.org/10.1134/s0021364024600460","url":null,"abstract":"<p>Peripheral membrane proteins are temporarily coupled to the surface of a membrane, penetrating into the lipid layer. In this work, it has been shown that the fraction of trans configurations of dihedral angles in hydrophobic chains of lipids decreases in the region of contact of peripheral membrane proteins with the membrane. This effect differs for different lipid chains and for dihedral angles at different distances from the beginning of a chain. A gosh configuration has a higher energy than a trans configuration. Consequently, the decrease in the fraction of trans configurations leads to an increase in the energy of the chain. The energy of chain conformations for the peripheral membrane protein considered in this work increases by ≈2 kJ/mol. A chain in chain conformations is involved in molecular mechanisms determining the elastic modulus of membranes. The energy stored in a conformation chain can be spent to the desorption of protein from the surface of the membrane and can be considered as a reason why the interaction of peripheral membrane proteins with the membrane is temporal.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255228","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
Conical Structures on the Liquid Surface in an Electric Field: Effect of Volume and Surface Charges 电场中液体表面的锥形结构：体积和表面电荷的影响
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600733
M. A. Belyaev, N. M. Zubarev, O. V. Zubareva
{"title":"Conical Structures on the Liquid Surface in an Electric Field: Effect of Volume and Surface Charges","authors":"M. A. Belyaev, N. M. Zubarev, O. V. Zubareva","doi":"10.1134/s0021364024600733","DOIUrl":"https://doi.org/10.1134/s0021364024600733","url":null,"abstract":"<p>Conical structures formed on the liquid surface with the surface ionic conductivity in an external electric field have been studied taking into account the effect of the volume electric charge of the flow of droplets emitted from the apex of the cone into the surrounding gas. Exact multiparametric self-similar solutions have been obtained for the electric field distribution near the apex of the cone and for the motion of charged ions and droplets in this field. These solutions have allowed us to determine and to classify relations between the angle of the liquid cone, droplet divergence angle, and the electric current through the cone at various parameters of the problem.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255217","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
Polarization Ellipse Strips in Nonparaxial Optical Fields (Brief Review) 非同轴光场中的偏振椭圆条（简评）
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600642
K. S. Grigoriev, N. Yu. Kuznetsov, V. A. Makarov
{"title":"Polarization Ellipse Strips in Nonparaxial Optical Fields (Brief Review)","authors":"K. S. Grigoriev, N. Yu. Kuznetsov, V. A. Makarov","doi":"10.1134/s0021364024600642","DOIUrl":"https://doi.org/10.1134/s0021364024600642","url":null,"abstract":"<p>This is a brief review of five-year studies of features of nontrivial three-dimensional topological structures of the electromagnetic field—optical strips—formed by vectors characterizing the sizes and orientation of the polarization ellipse of the light field with tracing of change in the orientations of these vectors along closed contours of various shapes, which are linked to lines of polarization singularity or are located immediately near them. The characteristics of polarization strips formed on arbitrarily oriented small circular contours around a single circular polarization singularity line of the electromagnetic field are described. The topology of polarization strips of light scattered by a dielectric sphere and a metallic spheroid with subwavelength sizes when elliptically polarized harmonic plane waves are incident on them is discussed. Optical polarization strips existing in the focal region of a parabolic mirror that tightly focus various laser beams incident on it is described. The topology of polarization ellipse strips in the electromagnetic field of laser radiation propagating in a planar metamaterial is discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255128","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
Magnetic Switching of FSF Bridges at Low Temperatures 低温下 FSF 电桥的磁性开关
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600836
L. N. Karelina, N. S. Shuravin, S. V. Egorov, V. V. Bol’ginov, V. V. Ryazanov
{"title":"Magnetic Switching of FSF Bridges at Low Temperatures","authors":"L. N. Karelina, N. S. Shuravin, S. V. Egorov, V. V. Bol’ginov, V. V. Ryazanov","doi":"10.1134/s0021364024600836","DOIUrl":"https://doi.org/10.1134/s0021364024600836","url":null,"abstract":"<p>The voltage–current characteristics of planar Pd<sub>0.99</sub>Fe<sub>0.01</sub>–Nb–Pd<sub>0.99</sub>Fe<sub>0.01</sub> microbridges at temperatures significantly lower than the critical one are studied experimentally. It has been found that a magnetic memory effect, which is manifested in the dependence of the shape of the voltage–current characteristics on the mutual orientation of the magnetizations of the F layers, is observed even at such low temperatures. It has been shown that the studied sample can serve as a magnetic switch with a voltage distinction of more than 600 μV, which corresponds to a characteristic frequency of about 300 GHz if such bridges are used as memory elements in rapid single-flux quantum logic devices. These characteristics are obtained at a temperature of 0.93<i>T</i><sub>c</sub>, which is the minimum operating temperature of the implemented memory element. A low-voltage mode of operation of the sample is discovered, characterized by a wide range of permissible bias currents.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255508","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
Formation of an O-Shaped Structure in the Red Wing of the Frequency–Angular Spectrum During Filamentation on a Long Atmospheric Path 长大气路径上的丝状物形成过程中频-角频谱红翼中的 O 形结构
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-06-04 DOI: 10.1134/s0021364024600770
D. V. Pushkarev, L. V. Seleznev, G. E. Rizaev, D. S. Uryupina, N. A. Zhidovtsev, O. G. Kosareva, A. B. Savel’ev
{"title":"Formation of an O-Shaped Structure in the Red Wing of the Frequency–Angular Spectrum During Filamentation on a Long Atmospheric Path","authors":"D. V. Pushkarev, L. V. Seleznev, G. E. Rizaev, D. S. Uryupina, N. A. Zhidovtsev, O. G. Kosareva, A. B. Savel’ev","doi":"10.1134/s0021364024600770","DOIUrl":"https://doi.org/10.1134/s0021364024600770","url":null,"abstract":"<p>An O-shaped structure at wavelengths of 930–960 nm in the frequency–angular spectrum of the supercontinuum generated during the filamentation of a femtosecond laser pulse with a central wavelength of 740 nm on a 75-m path in air has been observed experimentally. This feature of the frequency–angular spectrum is due to the presence of the absorption band of water vapor in the range of 930–960 nm and the anomalous dispersion region associated with this absorption. This result opens prospects for the remote single-pulse detection of impurities in air.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255044","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
Refined TMD Gluon Density in a Proton from the HERA and LHC Data 从 HERA 和大型强子对撞机数据中精炼质子中的 TMD 胶子密度
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-28 DOI: 10.1134/s0021364024601234
A.V. Lipatov, G. I. Lykasov, M. A. Malyshev
{"title":"Refined TMD Gluon Density in a Proton from the HERA and LHC Data","authors":"A.V. Lipatov, G. I. Lykasov, M. A. Malyshev","doi":"10.1134/s0021364024601234","DOIUrl":"https://doi.org/10.1134/s0021364024601234","url":null,"abstract":"<p>We update the phenomenological parameters of the Transverse Momentum Dependent (TMD, or unintegrated) gluon density in a proton proposed in our previous studies. This analysis is based on the analytical expression for starting gluon distribution which provides a self-consistent simultaneous description of HERA data on proton structure function <i>F</i><sub>2</sub>(<i>x</i>, <i>Q</i><sup>2</sup>), reduced cross section for the electron-proton deep inelastic scattering at low <i>Q</i><sup>2</sup> and soft hadron production in <i>pp</i> collisions at the LHC conditions. We extend it to the whole kinematical region using the Catani–Ciafaloni–Fiorani–Marchesini (CCFM) evolution equation. Exploiting our previous results on a number of semihard QCD processes, we performed a combined fit to an extended set of LHC and HERA data, comprising a total of 509 points from 16 data sets. We illustrate our fit by applying the derived TMD gluon density in a proton to inclusive prompt photon photoproduction at HERA.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169049","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
Double Parton Scattering Versus Jet Quenching 双 Parton 散射与射流淬火
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-28 DOI: 10.1134/s0021364024601064
S. P. Baranov, A. V. Lipatov, M. A. Malyshev, A. M. Snigirev
{"title":"Double Parton Scattering Versus Jet Quenching","authors":"S. P. Baranov, A. V. Lipatov, M. A. Malyshev, A. M. Snigirev","doi":"10.1134/s0021364024601064","DOIUrl":"https://doi.org/10.1134/s0021364024601064","url":null,"abstract":"<p>A novel observable, the double nuclear modification factor, is proposed to probe simultaneously the initial and final state effects in nucleus-nucleus collisions. An interesting competition between the combinatorial enhancement in the double parton scattering and the suppression due to parton energy loss can be observed in the production rate of two hard particles. In particular, the production of <i>J</i>/ψ mesons in association with a W boson is not suppressed but is enhanced in the region of moderate transverse momenta, unlike the case of unassociated (inclusive) <i>J</i>/ψ production. At the same time, in the region of high enough transverse momenta the nuclear modification factor for associated <i>J</i>/ψ + <i>W</i> production converges to that of unassociated <i>J</i>/ψ.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169097","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
Magnetic Component of Quasi-coherent Mode of Plasma Fluctuations in Ohmic Plasma of the T-10 Tokamak T-10 托卡马克欧姆等离子体中等离子体波动的准相干模式的磁分量
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-28 DOI: 10.1134/s002136402460143x
N. S. Sergeev, A. V. Melnikov, L. G. Eliseev
{"title":"Magnetic Component of Quasi-coherent Mode of Plasma Fluctuations in Ohmic Plasma of the T-10 Tokamak","authors":"N. S. Sergeev, A. V. Melnikov, L. G. Eliseev","doi":"10.1134/s002136402460143x","DOIUrl":"https://doi.org/10.1134/s002136402460143x","url":null,"abstract":"<p>In this work the phenomenon of the quasi-coherent mode of plasma fluctuations in purely ohmic plasmas of the T-10 tokamak is investigated. The plasma magnetic fluctuation spectra along with spectra of relative electron density oscillations and plasma potential fluctuation spectra were studied. The presence of both electrostatic and magnetic components of the quasi-coherent mode has been established in the core and as well at the edge regions of the plasma column. This fact allows one to consider the quasi-coherent mode as one of the types of electromagnetic turbulence of fusion plasma.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169234","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
Single-photon Level Quantum Memory in an Isotopically Pure 143Nd3+:Y7LiF4 Crystal 同位素纯 143Nd3+:Y7LiF4 晶体中的单光子级量子存储器
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-28 DOI: 10.1134/s0021364024601167
R. A. Akhmedzhanov, L. A. Gushchin, N. A. Nizov, V. A. Nizov, D. A. Sobgayda, I. V. Zelensky
{"title":"Single-photon Level Quantum Memory in an Isotopically Pure 143Nd3+:Y7LiF4 Crystal","authors":"R. A. Akhmedzhanov, L. A. Gushchin, N. A. Nizov, V. A. Nizov, D. A. Sobgayda, I. V. Zelensky","doi":"10.1134/s0021364024601167","DOIUrl":"https://doi.org/10.1134/s0021364024601167","url":null,"abstract":"<p>In an isotopically pure <sup>143</sup>Nd<sup>3+</sup>:Y<sup>7</sup>LiF<sub>4</sub> crystal we demonstrate an optical quantum memory on a single photon level using the atomic frequency comb memory protocol. Using weakened laser pulses we demonstrate storage efficiency of 6.5% with the storage time of ~60 ns and signal to noise ratio of around 3.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169319","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
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