检索结果-内蒙古大学图书馆

Self-assembling of multilayered polymorphs with ion beams

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Azarov, Alexander Radu, Cristian Galeckas, Augustinas Mercioniu, Ionel Florinel Cernescu, Adrian Venkatachalapathy, Vishnukanthan Monakhov, Edouard Djurabekova, Flyura Ghica, Corneliu Zhao, Junlei Kuznetsov, Andrej Department of Physics Centre for Materials Science and Nanotechnology University of Oslo PO Box 1048 Blindern OsloN-0316 Norway National Institute of Materials Physics Atomistilor 405A Magurele077125 Romania Attocube systems AG Eglfinger Weg 2 Haar85540 Germany Department of Physics Helsinki Institute of Physics University of Helsinki P.O. Box 43 FI-00014 Finland Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China

Polymorphism contributes to the diversity of nature, so that even materials having identical chemical compositions exhibit variations in properties because of different lattice symmetries. Thus, if stacked together into multilayers, polymorphs may work as an alternative approach to the sequential deposition of layers with different chemical compositions. However, selective polymorph crystallization during conventional thin film synthesis is not trivial;e.g. opting for step-like changes of temperature and/or pressure correlated with switching from one polymorph to another during synthesis is tricky, since it may cause degradation of the structural quality. In the present work, applying the disorder-induced ordering approach we fabricated such multilayered polymorph structures using ion beams. We show that during ion irradiation of gallium oxide, the dynamic annealing of disorder may be tuned towards self-assembling of several polymorph interfaces, consistently with theoretical modelling. Specifically, we demonstrated multilayers with two polymorph interface repetitions obtained in one ion beam assisted fabrication step. Importantly, single crystal structure of the polymorphs was maintained in between interfaces exhibiting repeatable crystallographic relationships, correlating with optical cross-sectional maps. This data paves the way for enhancing functionalities in materials with not previously thought capabilities of ion beam technology. © 2024, CC BY-NC-ND.

关键词： Ion beams

Non-Reciprocal Current-Phase Relation and Superconducting Diode Effect in Topological-Insulator-Based Josephson Junctions

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Kudriashov, A. Zhou, X. Hovhannisyan, R.A. Frolov, A. Elesin, L. Wang, Y. Zharkova, E.V. Taniguchi, T. Watanabe, K. Yashina, L.A. Liu, Z. Zhou, Xin Novoselov, K.S. Bandurin, D.A. Institute for Functional Intelligent Materials National University of Singapore Singapore117575 Singapore Department of Physics Stockholm University AlbaNova University Center StockholmSE-10691 Sweden Chemistry Department M.V. Lomonosov Moscow State University Moscow Russia Programmable Functional Materials Lab Center for Neurophysics and Neuromorphic Technologies Moscow127495 Russia International Center for Materials Nanoarchitectonics National Institute of Material Science Tsukuba305-0044 Japan Research Center for Functional Materials National Institute of Material Science Tsukuba305-0044 Japan School of Materials Science and Engineering Nanyang Technological University Singapore639798 Singapore Department of Materials Science and Engineering National University of Singapore 117575 Singapore

Josephson junctions (JJ) are essential for superconducting quantum technologies and searches of self-conjugate quasiparticles, pivotal for fault-tolerant quantum computing. Measuring the current-phase relation (CPR) in JJ based on topological insulators (TI) can provide critical insights into unconventional phenomena in these systems, such as the presence of Majorana bound states (MBS) and the nature of non-reciprocal transport. However, reconstructing CPR as a function of magnetic field in such JJs has remained experimentally challenging. Here, we introduce a platform for precise CPR measurements in planar JJs composed of NbSe2 and few layer thick Bi2Se3 (TI) as a function of magnetic field. When a single flux quantum Φ0 threads the junction, we observe anomalous peak-dip-shaped CPR behaviour and non-reciprocal supercurrent flow. We demonstrate that these anomalies stem from the edge-amplified sloped supercurrent profile rather than MBS signatures often invoked to explain puzzles emerging near Φ0 in TI-based JJ. Furthermore, we show that such a supercurrent profile gives rise to a previously overlooked, robust and tunable Josephson diode effect. These findings establish field-dependent CPR measurements as a critical tool for exploring topological superconducting devices and offer new design principles for non-reciprocal superconducting electronics. Copyright © 2025, The Authors. All rights reserved.

关键词： Topological insulators

Significant Unconventional Anomalous Hall Effect in Heavy Metal/Antiferromagnetic Insulator Heterostructures

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Liang, Yuhan Wu, Liang Dai, Minyi Zhang, Yujun Zhang, Qinghua Wang, Jie Zhang, Nian Xu, Wei Zhao, Le Chen, Hetian Ma, Ji Wu, Jialu Cao, Yanwei Yi, Di Ma, Jing Jiang, Wanjun Hu, Jia-Mian Nan, Ce-Wen Lin, Yuan-Hua School of Materials Science and Engineering Tsinghua University Beijing100084 China Faculty of Materials Science and Engineering Kunming University of Science and Technology Yunnan Kunming650093 China Department of Materials Science and Engineering University of Wisconsin-Madison MadisonWI United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Chinese Academy of Sciences Shanghai200050 China Department of Physics Tsinghua University Beijing100084 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

The anomalous Hall effect (AHE) is a quantum coherent transport phenomenon that conventionally vanishes at elevated temperatures because of thermal dephasing. Therefore, it is puzzling that the AHE can survive in heavy metal (HM)/antiferromagnetic (AFM) insulator (AFMI) heterostructures at high temperatures yet disappears at low temperatures. In this paper, we report that an unconventional high-temperature AHE in HM/AFMI is observed only around the Néel temperature of AFM, with large anomalous Hall resistivity up to 40 nΩ cm. This mechanism is attributed to the emergence of a noncollinear AFM spin texture with a non-zero net topological charge. Atomistic spin dynamics simulation shows that such a unique spin texture can be stabilized by the subtle interplay among the collinear AFM exchange coupling, interfacial Dyzaloshinski-Moriya interaction, thermal fluctuation, and bias magnetic field. © 2023, CC BY.

关键词： Heavy metals

Efficient Power Transfer via Induced Virtual Critical Coupling in an Overcoupled Silicon Nitride Microresonator

学校读者我要写书评

暂无评论

Efficient Power Transfer via Induced Virtual Critical Coupli...

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Hinney, Jakob Kim, Seunghwi Flatt, Graydon J.K. Datta, Ipshita Alii, Andrea Lipson, Michal Department of Electrical Engineering Columbia University New YorkNY10027 United States Photonics Advanced Science Research Catm City University of New Yor New YorkNY10031 United States Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States

We induce virtual critical coupling in an overcoupled photonic microresonator using complex-frequency pulses. We observe efficient cavity storage as an incident pulse of time constant 138 ps suppresses the resonant tr... 详细信息

ISBN: (纸本)9781957171258

关键词： Microresonators

Orientation-dependent deformation and pop-in behavior in 3C-SiC

学校读者我要写书评

暂无评论

Progress in Natural science: materials International 2025年

作者： Huang, Junquan Lin, Zihao Chen, Yujun Zhao, Song Jin, Tianye Chen, Junyun Li, Hui Nie, Anmin Tian, Yongjun State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Department of Mechanical Engineering University of Wisconsin-Madison MadisonWI53706 United States

Understanding the relationship between crystal orientation and deformation behavior is critical for optimizing the mechanical performance of 3C-SiC in advanced applications. Here, the effect of crystal orientation on elasto-plastic deformation behavior in 3C-SiC was systematically studied using nanoindentation experiments, high-resolution transmission electron microscopy (HRTEM), and molecular dynamics (MD) simulations. Pop-in events were experimentally observed on both the (001) and (111) crystallographic planes, with the (111) plane exhibiting a higher critical pop-in load than the (001) plane. Nanoindentation tests further revealed that the (111) plane has a higher elastic modulus and nanohardness compared to the (001) plane. HRTEM analysis showed that the pop-in behavior is primarily governed by dislocation slip activity. Dislocation slip on the {111} slip plane was observed beneath the indentation for both orientations, while additional dislocation slip on the {001} slip plane, characteristic of edge dislocations, was noted for the (111) plane. MD simulations confirmed similar dislocation activity and revealed amorphization in regions of high stress concentration. Amorphization was further shown to occur within shear band zones in both crystallographic planes. © 2025

关键词： Amorphization

Towards rational design of power-law rheology via DNA nanostar networks

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Conrad, Nathaniel Saleh, Omar A. Fygenson, Deborah K. Physics Department University of California Santa BarbaraCA93106 United States Materials Department University of California Santa BarbaraCA93106 United States Biomolecular Science and Engineering Program University of California Santa BarbaraCA93106 United States

We measure the rheology of transient hydrogels comprised of a single type of DNA nanostar that makes both strong and weak bonds. These gels exhibit power-law frequency-dependence of their storage and loss moduli, with scaling exponents that depend on the proportions of the two bonds. A diffusive stress-relaxation model, in which the strong-bond sub-network relieves stress by diffusing through an effective viscosity imposed by the weak bonds, explains the scaling of their moduli. The model has implications for the fractal dimensions of the strong-bond sub-network that are in good agreement with measurements and makes testable predictions for the viscoelasticity of other transient hydrogels. Overall, this work demonstrates the power of DNA nanotechnology to decipher, and potentially rationally design, power-law rheology. © 2023, CC BY-NC-ND.

关键词： Hydrogels

Comparing growth of titania and carbonaceous dusty nanoparticles in weakly magnetised capacitively coupled plasmas

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Ramkorun, Bhavesh Chandrasekhar, Gautam Rangari, Vijaya Thakur, Saikat C. Comes, Ryan B. Thomas Jr, Edward Physics Department Leach Science Center 380 Duncan Drive AuburnAL36832 United States Materials Science and Engineering John A. Kenney Hall Old Montgomery Road TuskegeeAL36088 United States

This study compares the growth cycles and spatial distribution of dust cloud for titania and carbonaceous dusty nanoparticles in capacitively coupled radiofrequency plasmas, with and without the presence of a weak magnetic field of approximately 500 Gauss. Findings on cycle time, growth rate, and spatial distribution of dust cloud are discussed. The growth of nanoparticles in these plasmas is cyclic, with particles reaching their maximum size and subsequently moving out of the plasma, followed by the generation of a new particle growth cycle. The presence of the magnetic field speeds up the growth cycle in both plasma. The magnetic field also makes the spatial distribution of the two dust cloud different from each other. Langmuir probe measurement of the background plasma parameters such as electron temperature and floating potential reveal radial variations in floating potential but not electron temperature. Furthermore, the magnetic field changes the radial variation of floating potential. These measurements, however, are not sufficient to explain why the two dust clouds appear differently. It is possible that the differences occur due to a gradient in the radial distribution of the magnetic field. Copyright © 2024, The Authors. All rights reserved.

关键词： Electron temperature

Current-density-modulated Antiferromagnetic Domain Switching Revealed by Optical Imaging in Pt/CoO(001) Bilayer

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Wu, Tong Chen, Haoran Ma, Tianping Xu, Jia Wu, Yizheng Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and Engineering Anhui University Hefei230601 China Department of Physics School of Physics and Telecommunication Engineering Shaanxi University of Technology Hanzhong723001 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Shanghai Key Laboratory of Metasurfaces for Light Manipulation Fudan University Shanghai200433 China

Efficient control of antiferromagnetic (AFM) domain switching in thin films is vital for advancing antiferromagnet-based memory devices. In this study, we directly observed the current-driven switching process of CoO AFM domains in the Pt/CoO(001) bilayer by the magneto-optical birefringence effect. The observed critical current density for AFM domain switching remains nearly constant across varying CoO thicknesses, associated with the consistent switching polarity nj, suggesting the dominance of the thermomagnetoelastic effect, where n and jstand for Néel vector and current density vector, respectively. Further confirmation comes from a similar switching process with njobserved in the Pt/Al2O3/CoO sample, excluding the contribution of spin current injection. Remarkably, it was also surprisingly observed that the Néel vector can be further switched parallel to the current direction (nj) at higher current density. Our findings not only enhance the understanding of current-driven AFM domain switching but also present new avenues for manipulating AFM domains. © 2024, CC BY.

关键词： Cobalt compounds

Emerging Interface Effects in Flat Optics

学校读者我要写书评

暂无评论

Emerging Interface Effects in Flat Optics

2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio science Meeting, AP-S/URSI 2023

作者： Moccia, Massimo Castaldi, Giuseppe Alù, Andrea Galdi, Vincenzo University of Sannio Department of Engineering BeneventoI-82100 Italy City University of New York Advanced Science Research Center Photonics Initiative New YorkNY10031 United States City University of New York Graduate Center Physics Program New YorkNY10016 United States

ISBN: (纸本)9781665442282

In this paper, we discuss how the manipulation and control of surface-wave propagation can be achieved in natural low-dimensional materials or metasurfaces through the engineering of planar discontinuities in the surface impedance. We present two specific examples, 'ghost line waves' and 'flat leaky waves', that offer new possibilities for controlling light at the nanoscale and may have potential applications in areas such as integrated waveguides, nonlinear optics, optical sensing, and sub-diffraction imaging. © 2023 IEEE.

关键词： Nonlinear optics