Cesium adsorption structures on Ag(111) were characterized in a low-temperature scanning tunneling microscopy experiment. At low coverages, atomic resolution of individual Cs atoms is occasionally suppressed in regions of an otherwise hexagonally ordered adsorbate film on terraces. Close to step edges Cs atoms appear as elongated protrusions along the step edge direction. At higher coverages, Cs superstructures with atomically resolved hexagonal lattices are observed. Kinetic Monte Carlo simulations model the observed adsorbate structures on a qualitative level.
Origin of a Superlattice Observed in Li$_{0.9}$Mo$_{6}$O$_{17}$ by Scanning Tunneling Microscopy
利用扫描隧道显微镜对锂紫青铜(Li $_{0.9}$ Mo $_{6}$ O $_{17}$)进行了室温下的研究。我们的测量使我们能够识别单晶解理面,并表明,它是可能的,以获得清洁的解理表面反映的晶体结构,而没有纳米级的表面无序的并发症。除了晶格之外,我们还观察到共存的不相称超晶格,波矢q = 0.5a* $\pm$ 0.25 b *。我们建议,超结构的起源是一个表面重建,这是驱动沿晶面,其中包含面内MoO $_{4}$四面体连接到面外MoO $_{6}$八面体通过角共享氧解理。当结合光谱测量,我们的研究显示了一个有前途的途径,通过它来研究复杂的物理在Li $_{0.9}$ Mo $_{6}$ O $_{17}$。
Atomic-Scale Characterization of Oxide Interfaces and Superlattices Using Scanning Transmission Electron Microscopy
National Laboratory of the Rockies(落基山国家实验室);Metallurgical and Materials Engineering Department, Colorado School of Mines(科罗拉多矿业学院冶金与材料工程系);Renewable and Sustainable Energy Institute, University of Colorado Boulder(科罗拉多大学博尔德分校可再生与可持续能源研究所)
In/GaN(0001)-$\boldsymbol{{\mathsf{\left(\!\sqrt{3}\times\!\sqrt{3}\right)\!R30^{\circ}}}}$ adsorbate structure as a template for embedded (In,Ga)N/GaN monolayers and short-period superlattices
我们探索了一种利用等离子体辅助分子束外延在GAN(0001)衬底上制备(In,Ga)N/GAN短周期超晶格的方法。我们利用存在的吸附物结构表现出自己的$(\sqrt{3}\times\!\sqrt{3})\text{R}30^{\circ}$表面重建原位观察到的反射高能电子衍射。该In吸附层在GAN表面上容纳最多1/3单层的In,并且在合适的条件下,可以嵌入GAN中以形成In $_{0.33}$ Ga $_{0.67}$ N量子片,其宽度自然地被限制为单个单层。周期性地插入这些量子片,我们合成的(In,Ga)N/GAN短周期超晶格的突变界面和高周期性的X射线衍射和扫描透射电子显微镜所示。嵌入的量子片被发现是由单分子层与In含量为0.25-0.29。对于6个单层的势垒厚度,超晶格引起的光致发光带在3.16 eV,接近这些结构的理论预测值。
Probing Plasmonic Oscillations in 2D Moiré Nanocrystal Superlattices by Low-Loss EELS
University of Pennsylvania(宾夕法尼亚大学);University of Washington(华盛顿大学);SuperSTEM, SciTech Daresbury Science and Innovation Campus(超级扫描透射电子显微镜,科学技术达尔斯伯里科学与创新园区);University of Leeds(利兹大学)
Realization of quantum spin Hall insulator superlattice with emergent multigap-like helical edge states
Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences(中国科学院北京凝聚态物理国家研究中心与物理研究所);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);School of Science, Jiangsu University of Science and Technology(江苏科技大学理学院);School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);Department of Physics, Hubei University(湖北大学物理系);New Cornerstone Science Laboratory(新基石科学实验室);Department of Physics, The University of Hong Kong(香港大学物理系);Department of Physics, Southern University of Science and Technology(南方科技大学物理系)
Depth-Resolved Evolution of Buried Polar Topologies in a PbTiO3/SrTiO3 Superlattice
Catalan Institute of Nanoscience and Nanotechnology - ICN2 (CSIC & BIST)(加泰罗尼亚纳米科学和技术研究所);Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich(于利希研究中心恩斯特·鲁卡电子显微与谱学中心);CiQUS, Centro Singular de Investigacion en Quimica Bioloxica e Materiais Moleculares, Departamento de Quimica-Fisica, Universidade de Santiago de Compostela(圣地亚哥-德孔波斯特拉大学生物化学与分子材料 singular 研究中心);Department of Materials Science and Engineering, University of Wisconsin-Madison(威斯康星大学麦迪逊分校材料科学与工程系);Chinese Academy of Sciences Fujian Institute of Research on the Structure of Matter(中国科学院福建物质结构研究所);School of Aerospace Engineering, Beijing Institute of Technology(北京理工大学航天工程学院);Institució Catalana de Recerca i Estudis Avançats (ICREA)(加泰罗尼亚研究高级学院)
Superconductivity in a Bulk Moire Superlattice Material
Indian Institute of Science Education and Research, Berhampur(印度科学教育研究所伯拉姆普尔分校);Indian Institute of Science, Bengaluru(印度科学研究所班加罗尔);Indian Institute of Technology, Kharagpur(印度理工学院哈格普尔分校)