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Frequency Сonversion of Femtosecond Ti:sapphire Laser Pulse to the Long-wave Mid-IR Range with BaGa2GeSe6 Crystal 利用 BaGa2GeSe6 晶体将飞秒钛：蓝宝石激光脉冲的频率转换到长波中红外范围
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024600988
I. O. Kinyaevskiy, A. V. Koribut, Ya. V. Grudtsyn, M. V. Ionin
{"title":"Frequency Сonversion of Femtosecond Ti:sapphire Laser Pulse to the Long-wave Mid-IR Range with BaGa2GeSe6 Crystal","authors":"I. O. Kinyaevskiy, A. V. Koribut, Ya. V. Grudtsyn, M. V. Ionin","doi":"10.1134/s0021364024600988","DOIUrl":"https://doi.org/10.1134/s0021364024600988","url":null,"abstract":"<p>Generation of ultrashort mid-IR pulses spanning from 8.5 to 10.5 μm with high energy (up to 4.5 μJ) was experimentally demonstrated through difference frequency generation in BaGa<sub>2</sub>GeSe<sub>6</sub> crystal pumped by 100-fs 0.95-μm Ti:sapphire laser pulses. Optical damage threshold and two-photon absorption coefficient were determined for this pump pulses. Frequency conversion efficiency reached 0.24% at 1.85 mJ pump pulse energy and was decreased at higher one. Estimations indicate that application of 15 mm in diameter wide-aperture BaGa<sub>2</sub>GeSe<sub>6</sub> sample will allow one to increase pump pulse energy up to ~10 mJ, and to increase the mid-IR pulse energy up to 24 μJ at the same efficiency.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929556","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
Schwinger-like Pair Production of Baryons in Electric Field 电场中重子的施文格样对生产
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024600824
A. Gorsky, A. Pikalov
{"title":"Schwinger-like Pair Production of Baryons in Electric Field","authors":"A. Gorsky, A. Pikalov","doi":"10.1134/s0021364024600824","DOIUrl":"https://doi.org/10.1134/s0021364024600824","url":null,"abstract":"<p>In this Letter we evaluate the probability rate for the Schwinger production of baryons in an external electric field in the worldline instanton approach in holographic QCD. The new exponentially suppressed processes in a constant electric field involving the composite worldline instantons are suggested which include the non-perturbative decay of a neutron into proton and charged meson and the spontaneous production of <i>p</i><span>(bar {n})</span>π<sup>–</sup> and <i>n</i><span>(bar {p})</span>π<sup>+</sup> states.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929563","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
Mutliple-gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide 非磁性化学计量钙钾铁四砷化物的多重间隙超导性
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024601313
T. E. Kuzmicheva, S. A. Kuzmichev, A. S. Medvedev
{"title":"Mutliple-gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide","authors":"T. E. Kuzmicheva, S. A. Kuzmichev, A. S. Medvedev","doi":"10.1134/s0021364024601313","DOIUrl":"https://doi.org/10.1134/s0021364024601313","url":null,"abstract":"<p>Using incoherent multiple Andreev reflection effect spectroscopy of planar break-junctions, we have studied the superconducting gap structure of CaKFe<sub>4</sub>As<sub>4</sub> pnictides (the 1144 family), those turning to the superconducting state in the stoichiometric composition with critical temperature <i>T</i><sub><i>c</i></sub> ≈ 36.1K.We have shown a coexistence of three bulk superconducting order parameters Δ<sub><i>i</i></sub>, and directly determined their magnitudes and corresponding characteristic ratios 2Δ<sub><i>i</i></sub>(0)/<i>k</i><sub><i>B</i></sub><i>T</i><sub><i>c</i></sub> ≈ 5.6, 3.9, and 1.3 at <i>T</i> <span>( ll )</span> <i>T</i><sub><i>c</i></sub>. We compare the gap structure of CaKFe<sub>4</sub>As<sub>4</sub> and sister pnictides of the 1144 and 122 families studied by us earlier.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929631","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
Shadowing and Antishadowing in the Rescaling Model 重缩放模型中的阴影和反阴影
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024601180
A. V. Kotikov, A. V. Lipatov, P. M. Zhang
{"title":"Shadowing and Antishadowing in the Rescaling Model","authors":"A. V. Kotikov, A. V. Lipatov, P. M. Zhang","doi":"10.1134/s0021364024601180","DOIUrl":"https://doi.org/10.1134/s0021364024601180","url":null,"abstract":"<p>Nuclear deep inelastic structure functions <span>(F_{2}^{A})</span>(<i>x</i>, <i>Q</i><sup>2</sup>) as well as parton distribution functions in a nuclei are investigated in the framework of rescaling model. Our analysis is based on analytical expressions for quark and gluon densities in a proton derived at the leading order of QCD coupling. By fitting the rescaling parameters from the experimental data on <span>(F_{2}^{A})</span>(<i>x</i>, <i>Q</i><sup>2</sup>)/<span>(F_{2}^{D})</span>(<i>x</i>, <i>Q</i><sup>2</sup>) ratio for several nuclear targets, we derive predictions for corresponding nuclear parton distributions and, thus, for shadowing and antishadowing effects.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929560","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
Antiferromagnetic-to-ferromagnetic Transition in the GdNiSi1 − xAlx Compound GdNiSi1 - xAlx 化合物中的反铁磁到铁磁转变
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024600757
R. D. Mukhachev, A. V. Lukoyanov, A. G. Kuchin
{"title":"Antiferromagnetic-to-ferromagnetic Transition in the GdNiSi1 − xAlx Compound","authors":"R. D. Mukhachev, A. V. Lukoyanov, A. G. Kuchin","doi":"10.1134/s0021364024600757","DOIUrl":"https://doi.org/10.1134/s0021364024600757","url":null,"abstract":"<p>In this work, the electronic structure and magnetic properties of GdNiSi have been investigated within the framework of theoretical DFT + <i>U</i> method. The antiferromagnetic ordering of the Gd moments was obtained as the ground state, whereas Ni and Si have negligible magnetic moments. An antiferromagnetic-to-ferromagnetic transition was found when GdNiSi is doped with Al in our theoretical calculations. The antiferromagnetic-to-ferromagnetic transition takes place in the Gd sublattice, the magnetic moments at the Gd ions remain the same but the type of magnetic ordering changes. It was found that even at concentrations as low as <i>x</i> = 0.1, the ferromagnetic ordering in the Gd sublattice is more favorable in total energy as the ground state which can be ascribed to the shortening of Gd-Gd distances and the oscillating behavior of the Ruderman–Kittel–Kasuya–Yosida interaction in the Al-doped compositions. The electronic structure demonstrates significant changes in the vicinity of the localized Gd 4<i>f</i> states that confirms the presence of the antiferromagnetic-to-ferromagnetic transition using our theoretical results for Al <i>x</i> <span>( geqslant )</span> 0.1 in good agreement with the previous experimental magnetic results.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929721","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
High-frequency Hall Effect and Transverse Electric Galvanomagnetic Waves in Current-biased 2D Electron Systems 电流偏置二维电子系统中的高频霍尔效应和横向电加电磁波
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s0021364024600563
A. S. Petrov, D. Svintsov
{"title":"High-frequency Hall Effect and Transverse Electric Galvanomagnetic Waves in Current-biased 2D Electron Systems","authors":"A. S. Petrov, D. Svintsov","doi":"10.1134/s0021364024600563","DOIUrl":"https://doi.org/10.1134/s0021364024600563","url":null,"abstract":"<p>We derive the <i>electrodynamic</i> conductivity tensor for 2DESs with dc drift with account for the high-frequency Hall effect (interaction of dc current with ac magnetic field). We demonstrate the limitations of the <i>quasistatic</i> approach which neglects this effect. With the help of <i>electrodynamic</i> conductivity we find a novel two-dimensional transverse electric (TE) electromagnetic mode. This mode is non-reciprocal with dispersion ω = <b>ku</b><sub>0</sub> and manifests itself in lowering the reflection coefficient of 2DES at the resonance frequency. In addition, we predict birefringence of an incident evanescent TE wave on a 2DES system with drift and find hints of Cerenkov amplification in the low frequency limit. We discuss the limitng cases when the quasistatic approach is suitable.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929562","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
Impact of Domain Wall Conduction on Ferroelectric Domain Reversal Kinetics 畴壁传导对铁电畴反转动力学的影响
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-13 DOI: 10.1134/s002136402460071x
E. Podivilov, N. Masnev, B. Sturman
{"title":"Impact of Domain Wall Conduction on Ferroelectric Domain Reversal Kinetics","authors":"E. Podivilov, N. Masnev, B. Sturman","doi":"10.1134/s002136402460071x","DOIUrl":"https://doi.org/10.1134/s002136402460071x","url":null,"abstract":"<p>Recent discovery and exploration of domain wall conduction in ferroelectrics promises to substantially modify the concept of the polarization reversal. We show by example of lithium niobate that the presence of domain wall conduction not only resolves the long standing problem of non-realistically high domain formation energy, but also leads to the exponential electric field dependences exp(–<i>E</i><sub><i>n</i></sub>/<i>E</i>) and exp(–<i>E</i><sub><i>l</i></sub>/<i>E</i>) for the rates of nucleation (<i>n</i>) and lateral (<i>l</i>) growth with characteristic fields <i>E</i><sub><i>n</i></sub> ≈ 75 and <i>E</i><sub><i>l</i></sub> ≈ 15 kV/mm. The kinetics of the polarization reversal shows distinct stages of nucleation, lateral growth, and coalescence of separate domains. It corresponds, in agreement with experiment, to the common exponential law exp(<span>({{E}_{*}})</span>/<i>E</i>) for the reversal time with <i>E</i><sub><i>l</i></sub> &lt; <span>({{E}_{*}})</span> &lt; <i>E</i><sub><i>n</i></sub>. To the best of our knowledge, this study is the first one explaining theoretically this law.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929758","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
Modification of Topological Surface States in Novel Mn1 – xAxBi2Te4/MnBi2Te4 (A = Si, Ge, Sn, Pb) Topological Systems 新型 Mn1 - xAxBi2Te4/MnBi2Te4（A = Si、Ge、Sn、Pb）拓扑体系中拓扑表面态的改变
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-03 DOI: 10.1134/s0021364023603706
T. P. Estyunina, A. V. Tarasov, A. V. Eryzhenkov, D. A. Estyunin, A. M. Shikin
{"title":"Modification of Topological Surface States in Novel Mn1 – xAxBi2Te4/MnBi2Te4 (A = Si, Ge, Sn, Pb) Topological Systems","authors":"T. P. Estyunina, A. V. Tarasov, A. V. Eryzhenkov, D. A. Estyunin, A. M. Shikin","doi":"10.1134/s0021364023603706","DOIUrl":"https://doi.org/10.1134/s0021364023603706","url":null,"abstract":"<p>The possibility of changing the bandgap value of topological surface states in materials based on the MnBi<sub>2</sub>Te<sub>4</sub> intrinsic antiferromagnetic topological insulator is investigated using ab initio calculations. These materials are produced by the substitution of nonmagnetic chemical elements (A = Si, Ge, Sn, Pb) for magnetic metal atoms (Mn) in the surface (Mn<sub>1 –</sub> <sub><i>x</i></sub>A<sub><i>x</i></sub>Bi<sub>2</sub>Te<sub>4</sub>/MnBi<sub>2</sub>Te<sub>4</sub>) septuple layer. The results exhibit a s-ignificant modulation of the bandgap in a wide range from 60 meV to 0 meV with an increase in the doping level <i>x</i>. Moreover, it is found that the bandgap behavior depends on a dopant. Namely, a monotonic dependence of the bandgap on <i>x</i> is found for Si and Ge, whereas the bandgap minimum at <i>x</i> = 0.75 exists for Sn and Pb. The results obtained in this work suggest that the main mechanism of the bandgap modulation in the materials under study is a change in the localization of topological surface states.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887695","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
Dusty Plasma near the Surface of Saturn’s Moon Enceladus 土星卫星恩克拉多斯表面附近的尘埃等离子体
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-03 DOI: 10.1134/s0021364024600459
D. V. Shokhrin, S. I. Kopnin, S. I. Popel
{"title":"Dusty Plasma near the Surface of Saturn’s Moon Enceladus","authors":"D. V. Shokhrin, S. I. Kopnin, S. I. Popel","doi":"10.1134/s0021364024600459","DOIUrl":"https://doi.org/10.1134/s0021364024600459","url":null,"abstract":"<p>It has been shown that a dusty plasma is formed in a layer over the illuminated surface of Saturn’s moon Enceladus due to photoelectric and electrostatic processes. Using a physicomathematical model to self-consistently describe the densities of photoelectrons and dust particles over the illuminated surface of Enceladus, distribution functions of photoelectrons near the surface, as well as the altitude dependences of electric fields and the density, charge, and size of dust particles, have been determined. It has been demonstrated that the photoelectric effect is an important process for the formation of the dusty plasma despite a large distance from Enceladus to the Sun. It has been shown that the density of photoelectrons over the surface of Enceladus can be an order of magnitude higher than the density of electrons and ions of the solar wind, and sizes of levitating dust particles exceed the characteristic sizes of dust particles rising over the surface of the Moon.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887698","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
Direct Multiphoton Femtosecond Infrared Laser Excitation of a Diamond Lattice in the Two-Phonon Region and Modification of Color Centers 直接多光子飞秒红外激光激发金刚石晶格的双丰子区域并改变颜色中心
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-05-03 DOI: 10.1134/s0021364024600496
N. A. Smirnov, Y. S. Gulina, N. I. Busleev, P. P. Pakholchuk, A. V. Gorevoi, V. G. Vins, S. I. Kudryashov
{"title":"Direct Multiphoton Femtosecond Infrared Laser Excitation of a Diamond Lattice in the Two-Phonon Region and Modification of Color Centers","authors":"N. A. Smirnov, Y. S. Gulina, N. I. Busleev, P. P. Pakholchuk, A. V. Gorevoi, V. G. Vins, S. I. Kudryashov","doi":"10.1134/s0021364024600496","DOIUrl":"https://doi.org/10.1134/s0021364024600496","url":null,"abstract":"<p>The nonlinear absorption of ultrashort laser pulses with intensities of 0.17–1.7 TW/cm<sup>2</sup> at an intrinsic two-photon absorption wavelength of 4673 nm in type IIb diamond has been studied experimentally. It has been shown that the main absorption mechanism in the studied sample is two-photon absorption with a coefficient of β<sub>2</sub> = (72 ± 7) cm/TW. Transmission microspectroscopy, visible photoluminescence, and infrared Fourier-transform microspectroscopy have demonstrated the possibility of laser-induced transformation of nitrogen impurity centers in synthetic type Ib diamond at higher radiation intensities.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887929","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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