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Unveiling the stacking-dependent electronic properties of the 2D ultrathin rare-earth metalloxenes family LnX2 (Ln = Eu, Gd, Dy;X = Ge, Si)

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Journal of Materials Chemistry C 2024年第16期12卷 5926-5933页

作者： Mihalyuk, Alexey N. Sheverdyaeva, Polina M. Chou, Jyh-Pin Matetskiy, Andrey V. Eremeev, Sergey V. Zotov, Andrey V. Saranin, Alexander A. Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia Strada Statale 14 km 163.5 Trieste34149 Italy Department of Physics National Changhua University of Education No. 1 Jinde Rd. Changhua County Changhua City50007 Taiwan Institute of Strength Physics and Materials Science Tomsk634055 Russia

Studies of electronic effects in reduced dimensionality have become a frontier in nanoscience due to the exotic and highly tunable character of quantum phenomena. Recently, a new class of 2D ultrathin LnX2 metalloxenes composed of a triangular lattice of lanthanide ions (Ln) coupled with 2D-Xenes of silicene or germanene (X2) was introduced and studied with a particular focus on magnetic and transport properties. However, the electronic properties of metalloxenes and their effective functionalization remain mainly unexplored. Here, using a number of experimental and theoretical techniques, we trace the evolution of the electronic properties and magnetic ground state of metalloxenes triggered by external perturbations. We demonstrate that the band structure of LnX2 films can be uniquely modified by controlling the Xenes stacking, thickness, varying the rare-earth and host elements, and applying an external electric field. Our findings suggest new pathways to manipulate the electronic properties of 2D rare-earth magnets that can be adjusted for spintronics applications. © 2024 The Royal Society of Chemistry

关键词： Electronic properties

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Laser-induced periodic structures-assisted surface plasmon resonance refractive index sensor 8

Laser-induced periodic structures-assisted surface plasmon r...

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Plasmonics VIII 2024

作者： Bronnikov, Kirill Munkueva, Zhibzema Terentiev, Vadim Simonov, Victor Mikerin, Sergey Babin, Sergey A. Kuchmizhak, Aleksandr Dostovalov, Alexander Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia School of Physics and Engineering ITMO University St. Petersburg191002 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (纸本)9781510682184

Laser-induced periodic surface structures (LIPSS) offer a simple, single-step technique for creating periodic patterns on solids in an ambient air. Combined with metals like gold or silver, LIPSS enhances grating-assisted refractive index (RI) sensors using surface plasmon resonance (SPR). This study analyzes an SPR sensor in the Kretschmann configuration with a periodically modulated silver layer. The modulation is created by LIPSS formed on a titanium-coated glass prism using femtosecond laser pulses, followed by a silver coating. Reflection spectra for wavelengths λ = 600-1700 nm were calculated for various angles of incidence and RI values (1.33-1.4). Unlike a flat sensor with a single resonance, the LIPSS-based sensor shows multiple resonances (λ = 1000-1700 nm) due to modes on inner and outer interfaces. LIPSS reduces resonance spectral width by an order of magnitude, but also reduces sensitivity similarly, weakly affecting the Figure of Merit. The LIPSS-assisted sensor was also tested experimentally. © 2024 SPIE.

关键词： Femtosecond lasers

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Pushing an Altermagnet to the Ultimate 2D Limit: Symmetry Breaking in Monolayers of GdAlSi

arXiv

引用

arXiv 2024年

作者： Parfenov, Oleg E. Averyanov, Dmitry V. Sokolov, Ivan S. Mihalyuk, Alexey N. Kondratev, Oleg A. Taldenkov, Alexander N. Tokmachev, Andrey M. Storchak, Vyacheslav G. National Research Center "Kurchatov Institute" Kurchatov Sq. 1 Moscow123182 Russia Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia

Altermagnets have emerged as a class of materials combining certain ferromagnetic properties with vanishing net magnetization. This combination is highly promising for spintronics, especially if a material can be brought to a nanoscale size. However, experimental studies of the 2D limit of altermagnets and evolution of their properties with thickness are lacking. Here, we study epitaxial films on silicon of the Weyl altermagnet GdAlSi ranging from more than a hundred unit cells to a single unit cell. The films are synthesized by molecular beam epitaxy and, expectedly, do not show any discernible net magnetic moments. Electron transport studies reveal a remarkable transformation of the electron state with the film thickness. Thick films exhibit negative longitudinal magnetoresistance associated with the chiral anomaly but do not demonstrate altermagnetic properties in electron transport due to symmetry restrictions. In ultrathin films, a spontaneous anomalous Hall effect manifests itself, indicating a non-relativistic spin splitting in the electronic structure. The transformation is associated with crystal symmetry breaking accompanying the 3D-to-2D crossover. The work highlights the role of dimensionality in altermagnetism and provides a platform for studies of altermagnets aiming at ultra-compact spintronics. © 2024, CC BY.

关键词： Molecular beam epitaxy

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Monolayer Magnetic Metal with Scalable Conductivity

arXiv

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arXiv 2024年

2D magnets have emerged as a class of materials highly promising for studies of quantum phenomena and applications in ultra-compact spintronics. Current research aims at design of 2D magnets with particular functional properties. A formidable challenge is to produce metallic monolayers: the material landscape of layered magnetic systems is strongly dominated by insulators;rare metallic magnets, such as Fe3GeTe2, become insulating as they approach the monolayer limit. Here, electron transport measurements demonstrate that the recently discovered 2D magnet GdAlSi – graphene-like AlSi layers coupled to layers of Gd atoms – remains metallic down to a single monolayer. Band structure analysis indicates the material to be an electride, which may stabilize the metallic state. Remarkably, the sheet conductance of 2D GdAlSi is proportional to the number of monolayers – a manifestation of scalable conductivity. The GdAlSi layers are epitaxially integrated with silicon, facilitating applications in electronics. © 2024, CC BY.

关键词： Monolayers

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Formation of thermochemical laser-induced periodic structures on titanium films in a nitrogen-rich atmosphere 5

Formation of thermochemical laser-induced periodic structure...

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Advanced Laser Processing and Manufacturing V 2021

作者： Bronnikov, Kirill Dostovalov, Alexander Okotrub, Konstantin Kuchmizhak, Aleksandr Korolkov, Victor Babin, Sergey Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (数字)9781510646346

ISBN: (纸本)9781510646339

Recently, highly regular thermochemical laser-induced periodic surface structures (TLIPSS) have become the subject of active studies. TLIPSS are formed in the interference maxima due to the local oxidation of the material irradiated with ultrashort laser pulses and are characterized by the elevation of the relief that forms parallel oxide protrusions. The gas surrounding is expected to affect the morphology and chemical composition of the resulting TLIPSS;however, such effects were rarely studied so far. Here we present the results of the TLIPSS fabrication on glass-supported Si-Ti bilayer films using an astigmatic Gaussian IR femtosecond beam both in air and a nitrogen-rich atmosphere. The formation of ordered TLIPSS with the period of ≈ 920 nm is observed at slow scanning speeds (∼1 μm/s) and low fluences in a nitrogen-rich atmosphere. Raman spectroscopy revealed the presence of TiO2 (rutile) peaks, as well as bands centered at 280 cm-1 and 320 cm-1, which can be related to TiN in amorphous and polycrystalline phase. © 2021 SPIE.

关键词： Nitrogen

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On improved model of solid porous fuel gasification in low-temperature gas generator for flying vehicle

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AIP Conference Proceedings 2023年第1期2504卷

作者： Nickolay A. Lutsenko 1Institute of Automation and Control Processes FEB RAS Vladivostok Russia 2Far Eastern Federal University Vladivostok Russia

An improved mathematical model of solid porous fuel gasification in a combined charge of a low-temperature gas generator has been developed. For taking into account the change in the molar mass of the gas, a differential equation has been added to the model for determining the density of the gas that arising from solid fuel as a result of the gasification process. This allows one to determine the amount of gasification products and to accurately calculate the molar mass of the gas mixture at each point of the gas generator at each time. Calculations carried out using the refined model have shown that taking into account the change in molar mass of the gas can lead to significant changes in some of the unknown functions, such as the gas velocity and density. At the same time, the velocity of the gasification wave propagation changes very insignificantly. Thus, taking into account the change in molar mass of the gas has little effect on the estimation of the maximum operating time of the propulsion system.

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On modeling the process of solid fuel sublimation in a combined charge of a low-temperature gas-generator in the OpenFOAM software

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AIP Conference Proceedings 2023年第1期2504卷

作者： K. G. Borovik S. S. Fetsov 1Institute of Automation and Control Processes of the FEB RAS 690041 Vladivostok Russia 2Far Eastern Federal University 690091 Vladivostok Russia

A novel computational method is proposed for studying the processes of solid fuel sublimation in a combined charge of a low-temperature gas generator. The method is based on the finite volume discretization and the SIMPLE algorithm and is implemented in the OpenFOAM software. The computational results are compared with those obtained by the previously developed finite-difference method, and the higher performance of the new model is revealed. Another advantage of the method is that it is more convenient for use, more flexible for certain modifications, and can be easily adapted for multidimensional problems.

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Unveiling the stacking-dependent electronic properties of 2D ultrathin rare-earth metalloxenes family LnX2 (Ln = Eu, Gd, Dy;X = Ge, Si)

arXiv

引用

arXiv 2024年

作者： Sheverdyaeva, Polina M. Mihalyuk, Alexey N. Chou, Jyh-Pin Matetskiy, Andrey V. Eremeev, Sergey V. Zotov, Andrey V. Saranin, Alexander A. Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche TriesteI-34149 Italy Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia Department of Physics National Changhua University of Education No.1 Jinde Rd. Changhua County Changhua50007 Taiwan Institute of Strength Physics and Materials Science SB RAS Tomsk634055 Russia

The studies of electronic effects in reduced dimensionality have become a frontier in nanoscience due to exotic and highly tunable character of quantum phenomena. Recently, a new class of 2D ultrathin LnX2 metalloxenes composed of a triangular lattice of lanthanide ions (Ln) coupled with 2D-Xenes of silicene or germanene (X2) was introduced and studied with a particular focus on magnetic and transport properties. However, the electronic properties of metalloxenes and their effective functionalization remain mainly unexplored. Here, using a number of experimental and theoretical techniques, we trace the evolution of electronic properties and magnetic ground state of metalloxenes triggered by external perturbations. We demonstrate that the band structure of LnX2 films can be uniquely modified by controlling the Xenes stacking, thickness, varying the rare-earth and host elements, and applying an external electric field. Our findings suggest new pathways to manipulate the electronic properties of 2D rare-earth magnets that can be adjusted for spintronics applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Electronic properties

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A novel OpenFOAM solver for modelling thermo- and fluid dynamic processes in porous media

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AIP Conference Proceedings 2023年第1期2504卷

作者： Sergey S. Fetsov Alina S. Kim 1Institute of Automation and Control Processes FEB RAS 5 Radio st. Vladivostok Russia 2Far Eastern Federal University 10 p. Ajax Vladivostok Russia

A novel computational model based on the finite volume method is proposed for studying processes in heat-evolutional porous media. The developed model is implemented in OpenFOAM software. The problem of one-dimensional time-dependent gas flow through a porous heat-releasing medium is considered for testing the model. The computational results are compared with those obtained by the previously developed numerical procedure based on the finite difference method, and it is found that the performance of the proposed method is better than that of previously developed one.

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Crystallization of optically thick amorphous silicon films by near-ir femtosecond laser processing 5th

Crystallization of optically thick amorphous silicon films b...

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5th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2020

作者： Mitsai, Eugeny Dostovalov, Alexander Bronnikov, Kirill Nepomniaschiy, Alexander Zhizhchenko, Alexey Kuchmizhak, Aleksandr Institute of Automation and Control Processes FEB RAS 5 Radio St Vladivostok690041 Russia Institute of Chemistry FEB RAS 159 Pr-t. 100-letiya Vladivostoka Vladivostok690022 Russia Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia

ISBN: (纸本)9783035737936

We demonstrated efficient crystallization of amorphous Si films induced by their direct irradiation with near-IR femtosecond laser pulses coming at sub-MHz repetition rate. Comprehensive analysis of morphology and composition of the laser-annealed film by atomic-force microscopy, Fourier-transform IR, Raman and energy dispersive X-ray spectroscopy as well as numerical modeling of optical spectra confirmed efficient crystallization of amorphous Si and high-quality of the obtained films opening pathway for applications in thin-film solar cells, transistors and displays. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Amorphous silicon

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