U.S.- Czech Materials Research on Dynamics of Adatoms and Nanostructure Formation

爱荷华州立大学的Michael Trin gides和科罗拉多州科学院物理研究所的Zdenek Chvoj共同开展的这一美国-捷克材料研究项目的目标是研究吸附原子动力学和表面扩散在外延生长中的作用。这包括原子在(111)表面上的扩散机制，主要使用银、银作为模型系统。具体地说，研究人员打算研究外延中的层间扩散，吸附原子-衬底相互作用的作用，以及控制半导体表面均匀高度金属岛形成的动力学。Ames团队将使用高分辨率电子折射和扫描隧道显微镜进行实验工作，以获得生长结构的原子图像。捷克合作伙伴将利用分析模型和蒙特卡洛模拟探讨联合项目的理论问题。这些结果有望完善理解和操纵金属和半导体表面上金属吸附原子的复杂动力学和生长模式的基本背景。如果成功，将提高我们生长和控制纳米结构形成的能力，在薄膜生长领域具有潜在的应用前景。该材料研究项目通过使美国和中欧的专家能够结合互补的人才，并在具有强烈共同兴趣和能力的领域共享研究资源，实现了促进科学知识发展的计划目标。更广泛的影响包括通过在合作机构的工作将美国和捷克的学生引入国际研究界，以及直接参与该项目的高级实验和建模技术。

The goal of this U.S.-Czech materials research project between Michael Tringides of Iowa State University and Zdenek Chvoj of the Institute of Physics, Academy of Sciences, CR, is to study adatom dynamics and the role of surface diffusion in epitaxial growth. This includes atomic diffusion mechanisms on (111) surfaces, using primarily silver, Ag, as a model system. Specifically the researchers intend to examine interlayer diffusion in epitaxy, the role of adatom-substrate interactions, and the kinetics controlling the formation of uniform height metal islands on semiconductor surfaces. Experimental work will be done by the Ames group using high-resolution electron defraction and scanning tunneling microscopy to obtain atomic images of the growth structures. Czech partners will address theoretical aspects of the joint project using analytical models and Monte Carlo simulations. Results are expected to refine the basic context for understanding and manipulating the complex dynamics and growth modes of metal adatoms on metal and semiconductor surfaces. Success would enhance our ability to grow and control the formation of nanostructures, with potential applications in the field of film growth. This materials research project fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence. Broader impacts include the introduction of U.S. and Czech students to the international research community through work at partner institutions and direct involvement in the project's advanced experiments and modeling techniques.