arXiv - PHYS - Mesoscale and Nanoscale Physics最新文献_第7页

Manipulating moires by controlling heterostrain in van der Waals devices 通过控制范德瓦尔斯器件中的异应变操纵摩尔纹

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07427

Ian Sequeira, Andrew Z. Barabas, Aaron H Barajas-Aguilar, Michaela G Bacani, Naoto Nakatsuji, Mikito Koshino, Takashi Taniguichi, Kenji Watanabe, Javier D. Sanchez-Yamagishi

{"title":"Manipulating moires by controlling heterostrain in van der Waals devices","authors":"Ian Sequeira, Andrew Z. Barabas, Aaron H Barajas-Aguilar, Michaela G Bacani, Naoto Nakatsuji, Mikito Koshino, Takashi Taniguichi, Kenji Watanabe, Javier D. Sanchez-Yamagishi","doi":"arxiv-2409.07427","DOIUrl":"https://doi.org/arxiv-2409.07427","url":null,"abstract":"Van der Waals (vdW) moires offer tunable superlattices that can strongly\u0000manipulate electronic properties. We demonstrate the in-situ manipulation of\u0000moire superlattices via heterostrain control in a vdW device. By straining a\u0000graphene layer relative to its hexagonal boron nitride substrate, we modify the\u0000shape and size of the moire. Our sliding-based technique achieves uniaxial\u0000heterostrain values exceeding 1%, resulting in distorted moires that are larger\u0000than those achievable without strain. The stretched moire is evident in\u0000transport measurements, resulting in shifted superlattice resistance peaks and\u0000Landau fans consistent with an enlarged superlattice unit cell. Electronic\u0000structure calculations reveal how heterostrain shrinks and distorts the moire\u0000Brillouin zone, resulting in a reduced electronic bandwidth as well as the\u0000appearance of highly anisotropic and quasi-1-dimensional Fermi surfaces. Our\u0000heterostrain control approach opens a wide parameter space of moire lattices to\u0000explore beyond what is possible by twist angle control alone.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Static quantum dot on a potential hilltop for generating and analyzing hot electrons in the quantum Hall regime 用于在量子霍尔机制下产生和分析热电子的电位山顶静态量子点

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07061

Ryo Oishi, Yuto Hongu, Tokuro Hata, Chaojing Lin, Takafumi Akiho, Koji Muraki, Toshimasa Fujisawa

引用次数: 0

Topological Spin-Orbit Torque in Ferrimagnetic Weyl Semimetal 铁磁性韦尔半金属中的拓扑自旋轨道转矩

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07106

Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, Yasufumi Araki, Kentaro Nomura

引用次数: 0

Development of an embedded-atom method potential of Ni-Mo alloys for electrocatalysis / surface compositional studies 开发用于电催化的 Ni-Mo 合金的嵌入原子法潜力/表面成分研究

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07320

Ambesh Gupta, Chinmay Dahale, Soumyadipta Maiti, Sriram Goverapet Srinivasan, Beena Rai

{"title":"Development of an embedded-atom method potential of Ni-Mo alloys for electrocatalysis / surface compositional studies","authors":"Ambesh Gupta, Chinmay Dahale, Soumyadipta Maiti, Sriram Goverapet Srinivasan, Beena Rai","doi":"arxiv-2409.07320","DOIUrl":"https://doi.org/arxiv-2409.07320","url":null,"abstract":"Ni-Mo superalloys have emerged as materials of choice for a diverse array of\u0000applications owing to their superior mechanical properties, exceptional\u0000corrosion and oxidation resistance, electrocatalytic behavior, and surface\u0000stability. Understanding and optimizing the surface composition of Ni-Mo alloys\u0000is critical for enhancing their performance in practical applications.\u0000Traditional experimental surface analysis techniques, while informative, are\u0000often prohibitive in terms of cost and time. Likewise, theoretical approaches\u0000such as first-principle calculations demand substantial computational resources\u0000and it is difficult to simulate large structures. This study introduces an\u0000alternative approach utilizing hybrid Monte-Carlo / Molecular Dynamics (MC/MD)\u0000simulations to investigate the surface composition of Ni-Mo alloys. We report\u0000the development of an optimized Embedded-Atom Method (EAM) potential\u0000specifically for Ni-Mo alloys, carefully parameterized using empirical lattice\u0000constants and formation energies of elemental and face-centered cubic (FCC)\u0000Ni-Mo solid solution alloys. The reliability of the EAM potential is\u0000corroborated via the evaluation of equations of state, with a particular focus\u0000on reproducing structural properties. Utilizing this validated potential, MC/MD\u0000simulations were performed to understand the depth-wise variations in the\u0000compositions of Ni-Mo alloy nanoparticles and extended surfaces. These\u0000simulations reveal a preferential segregation of nickel on surface, and\u0000molybdenum in sub-surface layer. Due to this preferential segregation, it is\u0000imperative to consider surface segregation while tailoring the surface\u0000properties for targeted applications.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inner non-Hermitian skin effect on Bethe lattice 贝特晶格上的内部非赫米提皮肤效应

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07117

Junsong Sun, Chang-An Li, Shiping Feng, Huaiming Guo

引用次数: 0

Plasmon-Phonon Hybridization in Doped Semiconductors from First Principles 从第一原理看掺杂半导体中的等离子体-虹霓杂化

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.07393

Jae-Mo Lihm, Cheol-Hwan Park

引用次数: 0

General Stacking Theory for Altermagnetism in Bilayer Systems 双层体系异磁性的一般堆积理论

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-11 DOI: arxiv-2409.06964

Baoru Pan, Pan Zhou, Pengbo Lyu, Huaping Xiao, Xuejuan Yang, Lizhong Sun

{"title":"General Stacking Theory for Altermagnetism in Bilayer Systems","authors":"Baoru Pan, Pan Zhou, Pengbo Lyu, Huaping Xiao, Xuejuan Yang, Lizhong Sun","doi":"arxiv-2409.06964","DOIUrl":"https://doi.org/arxiv-2409.06964","url":null,"abstract":"Two-dimensional (2D) altermagnetism was recently proposed to be attainable in\u0000twisted antiferromagnetic bilayers providing an experimentally feasible\u0000approach to realize it in 2D materials. Nevertheless, a comprehensive\u0000understanding of the mechanism governing the appearance of altermagnetism in\u0000bilayer systems is still absent. In present letter, we address this gap by\u0000introducing a general stacking theory (GST) as a key condition for the\u0000emergence of altermagnetism in bilayer systems. The GST provides\u0000straightforward criteria to predict whether a bilayer demonstrates\u0000altermagnetic spin splitting, solely based on the layer groups of the composing\u0000monolayers. According to the GST, only seven point groups of bilayers\u0000facilitate the emergence of altermagnetism. It is revealed that, beyond the\u0000previously proposed antiferromagnetic twisted vdW stacking, altermagnetism can\u0000even emerge in bilayers formed through the symmetrically restricted direct\u0000stacking of two monolayers. By combining the GST and first-principles\u0000calculations, we present illustrative examples of bilayers demonstrating\u0000altermagnetism. Our work establishes a robust framework for designing diverse\u0000bilayer systems with altermagnetism, thereby opening up new avenues for both\u0000fundamental research and practical applications in this field.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Berry curvature and shift vector effects at high-order wave mixing in biased bilayer graphene 偏压双层石墨烯高阶波混合时的贝里曲率和位移矢量效应

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-10 DOI: arxiv-2409.06269

H. K. Avetissian, H. H. Matevosyan, G. F. Mkrtchian

引用次数: 0

Periodic source of energy-entangled electrons in helical states coupled to a BCS superconductor 与 BCS 超导体耦合的螺旋态能量纠缠电子的周期源

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-10 DOI: arxiv-2409.06591

Flavio Ronetti, Bruno Bertin-Johannet, Jérôme Rech, Thibaut Jonckheere, Benoît Grémaud, Laurent Raymond, Thierry Martin

引用次数: 0

Giant anisotropic anomalous Hall effect in antiferromagnetic topological metal NdGaSi 反铁磁拓扑金属 NdGaSi 中的巨型各向异性反常霍尔效应

arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-10 DOI: arxiv-2409.06250

Anyesh Saraswati, Sudipta Chatterjee, Nitesh Kumar

{"title":"Giant anisotropic anomalous Hall effect in antiferromagnetic topological metal NdGaSi","authors":"Anyesh Saraswati, Sudipta Chatterjee, Nitesh Kumar","doi":"arxiv-2409.06250","DOIUrl":"https://doi.org/arxiv-2409.06250","url":null,"abstract":"The interplay between magnetism and strong electron correlation in magnetic\u0000materials discerns a variety of intriguing topological features. Here, we\u0000report a systematic investigation of the magnetic, thermodynamic, and\u0000electrical transport properties in NdGaSi single crystals. The magnetic\u0000measurements reveal a magnetic ordering below T_N (11 K), with spins aligning\u0000antiferromagnetically in-plane, and it orders ferromagnetically (FM)\u0000out-of-plane. The longitudinal resistivity data and heat capacity exhibit a\u0000significant anomaly as a consequence of the magnetic ordering at TN. The\u0000magnetoresistance study shows significantly different behavior when measured\u0000along either direction, resulting from the complex nature of the magnetic\u0000structure, stemming from complete saturation of moments in one direction and\u0000subsequent spin flop transitions in the other. Remarkably, we have also noticed\u0000an unusual anisotropic anomalous Hall response. We have observed a giant\u0000anomalous Hall conductivity (AHC) of 1730 ohm-1 cm-1 and 490 ohm-1 cm-1 at 2 K,\u0000with B // [001] and B // [100], respectively. Our scaling analysis of AHC\u0000reveals that the anomalous Hall effect in the studied compound is dominated by\u0000the Berry phase-driven intrinsic mechanism. These astonishing findings in\u0000NdGaSi open up new possibilities for antiferromagnetic spintronics in\u0000rare-earth-based intermetallic compounds.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0