Propagating and Standing-Wave Plasmonic Modes in Low-Dimensional Atomic-Scale Objects

Nanoantenna ◽  
2013 ◽  
pp. 169-192 ◽  
Keyword(s):  
Standing Wave ◽  
Atomic Scale ◽  
Low Dimensional

scholarly journals Atomic-scale one-dimensional materials identified from graph theory

2021 ◽  
Author(s):  
Shunning Li ◽  
Zhefeng Chen ◽  
Zhi Wang ◽  
Mouyi Weng ◽  
Jianyuan Li ◽  
...  
Keyword(s):  
Graph Theory ◽  
Structural Information ◽  
Functional Materials ◽  
Atomic Scale ◽  
Computational Techniques ◽  
Electronic Band ◽  
One Dimensional ◽  
Atomic Chains ◽  
Future Data ◽  
Low Dimensional

Abstract The past decades have witnessed an exponential growth in the discovery of functional materials, benefited from our unprecedented capabilities in characterizing their structure, chemistry, and morphology with the aid of advanced imaging, spectroscopic and computational techniques. Among these materials, atomic-scale low-dimensional compounds, as represented by the two-dimensional (2D) atomic layers, one-dimensional (1D) atomic chains and zero-dimensional (0D) atomic clusters, have long captivated scientific interest due to their unique topological motifs and exceptional properties. Their tremendous potentials in various applications make it a pressing urgency to establish a complete database of their structural information, especially for the underexplored 1D species. Here we apply graph theory in combination with first-principles high-throughput calculations to identify atomic-scale 1D materials that can be conceptually isolated from their parent bulk crystals. In total, two hundred and fifty 1D atomic chains are shown to be potentially exfoliable. We demonstrate how the lone electron pairs on cations interact with the p-orbitals of anions and hence stabilize their edge sites. Data analysis of the 2D and 1D materials also reveals the dependence of electronic band gap on the cationic percolation network determined by graph theory. The library of 1D compounds systematically identified in this work will pave the way for the predictive discovery of material systems for quantum engineering, and can serve as a source of stimuli for future data-driven design and understanding of functional materials with reduced dimensionality.

LOW-DIMENSIONAL ELECTRONIC STATES AT METAL SURFACES: QUANTUM WELLS AND QUANTUM WIRES

1995 ◽  
Vol 02 (01) ◽  
pp. 81-88 ◽  
Author(s):  
F.J. HIMPSEL
Keyword(s):  
Quantum Wells ◽  
Giant Magnetoresistance ◽  
Quantum Wires ◽  
Magnetic Coupling ◽  
Magnetic Multilayers ◽  
Atomic Scale ◽  
Level Shifts ◽  
Stepped Surface ◽  
Low Dimensional ◽  
Step Edges

Several possibilities of “engineering” low-dimensional solids on the atomic scale are discussed. The electronic and magnetic structure of such materials is explored for two classes, i.e., multilayers and “wires” attached to step edges. Magnetic multilayers represent a particularly promising case, since quantum effects have macroscopic consequences. Quantization perpendicular to the layers is connected with oscillatory magnetic coupling, which in turn is important for obtaining “giant” magnetoresistance. This effect is being applied towards the fabrication of magnetoresistive reading heads for magnetically stored data. Extensions towards lateral superlattices and quantum wires are explored, where a stepped surface acts as a template. It is found that electrons can be trapped at step edges, and level shifts of the order 0.5 eV are observed for atoms adsorbed at step edges.

scholarly journals Energy coupling across low-dimensional contact interfaces at the atomic scale

2017 ◽  
Vol 110 ◽  
pp. 827-844 ◽  
Author(s):  
Yanan Yue ◽  
Jingchao Zhang ◽  
Yangsu Xie ◽  
Wen Chen ◽  
Xinwei Wang
Keyword(s):  
Energy Coupling ◽  
Atomic Scale ◽  
Low Dimensional

scholarly journals Processing and characterisation of two-dimensional nanostructures

2014 ◽  
Vol 70 (a1) ◽  
pp. C510-C510
Author(s):  
Valeria Nicolosi
Keyword(s):  
Electron Microscopy ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Atomic Scale ◽  
Metal Chalcogenides ◽  
Two Dimensional ◽  
Wide Range ◽  
Electron Microscopes ◽  
Low Dimensional ◽  
Aberration Corrected

Low-dimensional nanostructured materials such as organic and inorganic nanotubes, nanowires and platelets are potentially useful in a number of areas of nanoscience and nanotechnology due to their remarkable mechanical, electrical and thermal properties. However difficulties associated with their lack of processability have seriously hampered both. In the last few years dispersion and exfoliation methods have been developed and demonstrated to apply universally to 1D and 2D nanostructures of very diverse nature, offering a practical means of processing the nanostructures for a wide range of innovative technologies. Among the first materials to have benefitted most from these advances are carbon nanotubes [6] and more recently graphene. Recently this work has been extended to boron nitride and a wide range of two-dimensional transition metal chalcogenides. These are potentially important because they occur in >40 different types with a wide range of electronic properties, varying from metallic to semiconducting. To make real applications truly feasible, however, it is crucial to fully characterize the nanostructures on the atomic scale and correlate this information with their physical and chemical properties. Advances in aberration-corrected optics in electron microscopy have revolutionised the way to characterise nano-materials, opening new frontiers for materials science. With the recent advances in nanostructure processability, electron microscopes are now revealing the structure of the individual components of nanomaterials, atom by atom. Here we will present an overview of very different low-dimensional materials issues, showing what aberration-corrected electron microscopy can do to answer materials scientists' questions. Particular emphasis will be given to the investigation of hexagonal boron nitride (hBN), molybdenum disulfide (MoS2), and tungsten disulfide (WS2) and the study of their structure, defects, stacking sequence, vacancies and low-atomic number individual adatoms. The analyses of the h-BN data showed that majority of nanosheets retain bulk stacking. However several of the images displayed stacking different from the bulk. Similar, to 2D h-BN, images of MoS2 and WS2 have shown the stacking previously unobserved in the bulk. This novel stacking consists of Mo/W stacked on the top each other in the consecutive layers.

Atomistic and dynamic structural characterizations in low-dimensional materials: recent applications of in situ transmission electron microscopy

Microscopy ◽  
2019 ◽  
Author(s):  
He Zheng ◽  
Fan Cao ◽  
Ligong Zhao ◽  
Renhui Jiang ◽  
Peili Zhao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atomic Scale ◽  
Transmission Electron ◽  
Indispensable Tool ◽  
And Performance ◽  
Low Dimensional ◽  
Low Dimensional Materials

Abstract In situ transmission electron microscopy has achieved remarkable advances for atomic-scale dynamic analysis in low-dimensional materials and become an indispensable tool in view of linking a material’s microstructure to its properties and performance. Here, accompanied with some cutting-edge researches worldwide, we briefly review our recent progress in dynamic atomistic characterization of low-dimensional materials under external mechanical stress, thermal excitations and electrical field. The electron beam irradiation effects in metals and metal oxides are also discussed. We conclude by discussing the likely future developments in this area.

scholarly journals From atomic-scale interfaces - to new nanomaterials

2018 ◽  
Vol 1 (4) ◽  
Author(s):  
Nikolay Plusnin
Keyword(s):  
Transition Metal ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Ultrahigh Vacuum ◽  
Experimental Results ◽  
Atomic Scale ◽  
New Type ◽  
Low Dimensional ◽  
Silicon Interface

The problem of the synthesis of new type nanomaterials in the form of nanocoatings with subnanometric heterogeneity has been formulated. It has been presented an analysis of influences of physical vapor deposition in ultrahigh vacuum on the process of intermixing a film with a substrate, including the results, which has been obtained under the formation of transition metal – silicon interface. The generalization of the obtained experimental results allowed to develop an approach to the development of new nanocoatings with low-dimensional heterogeneity. The principles of constructing such low-dimensional nanocoatings, their properties and their possible applications are considered. 

scholarly journals Atomic-scale imaging and spectroscopy of defects in low-dimensional materials

2014 ◽  
Vol 70 (a1) ◽  
pp. C509-C509
Author(s):  
Kazu Suenaga
Keyword(s):  
Hexagonal Boron Nitride ◽  
Chemical Properties ◽  
Single Layer ◽  
Topological Defects ◽  
Layered Materials ◽  
Atomic Scale ◽  
Spatially Resolved ◽  
Imaging And Spectroscopy ◽  
Low Dimensional ◽  
Low Dimensional Materials

Atomic defects or edge structures are of great importance for any kind of low-dimensional materials, since the interrupted periodicities strongly affect their physical and/or chemical properties. Studies of point defects in mono-layered materials have become very popular among scientists. Vacancies and topological defects in graphene are routinely examined at atomic level. Defects and edge structures in hexagonal boron nitride (h-BN) and WS2 nano-ribbons are also a hot topic among physicists. Here we describe TEM and spatially resolved EELS studies of various single-layered materials with the interrupted periodicities. Atomic defects and edge structures can be unambiguously identified with the elemental assignment. The monovacancy analysis in h-BN single-layer and the alloying and doping behaviors of MoS2/WS2 single-layers will be presented.

Computational Study of Thermal Stabilities of Cu Nanorods at Atomic Scale

2013 ◽  
Vol 275-277 ◽  
pp. 1802-1805
Author(s):  
Duo Zhang ◽  
Yi Ju ◽  
Lin Zhang
Keyword(s):  
Structural Changes ◽  
Computational Study ◽  
Dynamic Properties ◽  
Biological Properties ◽  
Atomic Scale ◽  
Face Centered Cubic ◽  
Thermal Stabilities ◽  
Embedded Atom ◽  
Dynamics Simulations ◽  
Low Dimensional

Due to its unique mechanical，electrical，optical，chemical，catalytic and biological properties, nano-scale materials such as metal nanorods, have attracted wide attention. In these low-dimensional systems， Cu nanorods are ideal systems in novel electronic nano-devices and nano-catalysis. Nowadays the research of Cu nanorod has already become one of the central subjects in the nanomaterials science.In this paper, molecular dynamics simulations have been used to study structural changes of Cu nanorod during heating within the framework of embedded atom method (EAM) at the atomic scale，and their dynamics are also studied. During continuously heating processes, by studying the structure of the metal nanorods on the pair distribution function and energy changes，they are studied for the structural changes and dynamic properties of the Cu nanorods.The simulation results show that continuous changes of the Cu nanorods upon heating. At low temperatures, both the Cu nanorods have ordered arrangements with face-centered cubic structures. With increasing the temperature，the atom arrangements present the changes from the ordered state into the disordered state. It is also found that the size and shape of the nanorods have effect on the structural changes of these nanorods in the heating processes. The results show that the initial geometry of the nanorods greatly affect the structural change processes.

Sign in / Sign up

Export Citation Format

Share Document