应物理工程学院和河南省量子功能材料国际联合实验室的邀请，美国马里兰大学（University of Maryland） 物理系著名物理学家Theodore L. Einstein教授来我校开展为期两周凝聚态物理前沿学术交流和系列专题报告。讲授主要面向从事凝聚态物理研究的研究生和中青年教师。
T．Einstein教授1969年毕业于哈佛大学(Harvard University)，1973年于宾西法尼亚大学(University of Pennsylvania)获得博士学位，师从著名超导物理学家，1972年诺贝尔物理学奖获得者J. Robert Schrieffer教授。T. Einstein教授是美国物理学会fellow以及材料物理领域fellow。曾在美国物理学会（APS）担任过多个职务，是美国物理学会主办的系列杂志（APS journals）杰出审稿人。多次担任美国材料物理学会、美国真空物理学会会议主席，以及其它许多学术会议主席。任表面科学著名国际期刊Surface Science杂志编委。
T. Einstein教授长期从事表界面科学研究工作，是国际著名表面界面物理学家，在国际物理期刊发表论文150多篇，综述文章和邀请论文16篇，出版学术专著和合著16部，应邀做过多次大会邀请报告，是在国际上该领域有重要影响的科学家。
此次系列报告的主要内容涉及如下方面：
（1）. Interactions Between Steps on Surfaces: Entropic, Elastic, and Electronic
（2）. Metallic Surface States: Their Role in Pattern Formation of Molecules on Surfaces
（3）. Distinctive Features in Growth on Vicinal Cu(100): Understanding the Role of Impurities by Calculating Key Energies and Simulating Morphology
地点：郑州大学新校区 物理馆一楼报告厅
热情欢迎我校物理及材料等相关学科的师生参加！
郑州大学物理工程学院
河南省量子功能材料国际联合实验室
2012年6月11日
附件：报告摘要：Theodore L. Einstein
Depˊt of Physics, University of Maryland, College Park, MD 20742-4111 USA
Most of my papers are downloadable fromhttp://www2.physics.umd.edu/~einstein/publications.htm
1),Interactions Between Steps on Surfaces: Entropic, Elastic, and Electronic
This review describes the physical origins of the entropic, elastic, and electronic interactions between steps, as well as their form and their consequences. These interactions allow steps to communicate with each other and underpin equilibrium crystal shape. The standard expansion (in misorientation slope) of the projected free energy of a vicinal surface has a linear term, the step free energy per length, followed by a cubic term, indicating that the step-step interaction is proportional to -2, where (or w) is the terrace width, the distance between neighboring steps. This behavior is found for both entropic and elastic interactions, and leads to a terrace-width distribution independent of the mean step spacing . It is fruitful to view configurations of a vicinal surface as world lines of spinless fermions in 1D. The entropic, or steric, interaction interaction arises from the physically-derived non-crossing condition of steps, suppressing the number of allowed configurations when steps are near each other. In the simplest picture, the elastic interaction comes from the strain field associated with a step, which tends to try to relax toward a flat surface. The origin of the repulsion is frustrated relaxation of atoms on the terrace between two steps, with consequent increase in energy compared to two isolated steps. We emphasize that these two kinds of repulsions do not simply add. When there are only -2 interactions, Ã can be gauged from the width of the terrace width distribution (TWD) in simple and in sophisticated ways. A third kind of interaction, when there are partially filled bands, is the indirect electron interaction, which asymptotically is reminiscent of the sinusoidal RKKY interaction between magnetic impurities. When there are [metallic] surface states, it decays slowly and introduces a new length in the problem F, in addition to , which destroys the scaling of the TWD for different , as seen experimentally for Ag(110).
References
TLE, ″Interactions Between Adsorbate Particles,″ in Physical Structure of Solid Surfaces, W.N. Unertl, ed. (Elsevier, Amsterdam, 1996), Handbook of Surface Science, vol. 1, S. Holloway and N.V. Richardson, series eds., chap. 11, 577.
P. Nozières, in Solids Far from Equilibrium, C. Godrèche, ed. (Cambridge University Press, Cambridge, 1991), p.1.
J. Stewart, O. Pohland, and J. M. Gibson, ″Elastic-displacement Field of an Isolated Surface Step″, Phys. Rev. B 49, 13848 (1994).
W. W. Pai, J. S. Ozcomert, N. C. Bartelt, TLE, and J. E. Reutt-Robey, Terrace-Width Distributions on Vicinal Ag(110): Evidence of Oscillatory Interactions, Surface Sci. 307-309, 747-754 (1994).
TLE, ″Using the Wigner-Ibach Surmise to Analyze Terrace-Width Distributions: History, Userˊs Guide, and Advances″, Appl. Phys. A 87, 375 (2007).郑州大学版权所有，禁止非法转载！2020-09-30 15:22:58