An Integrated First-Principles and Many-Body Theory Description of Electron-Phonon Superconductors

9627778 Freericks/刘 这笔赠款支持一个新的计划，由两名年轻的教师，一名女性（A。他在乔治城大学从事凝聚态物理学研究。 该补助金支持工作的仔细和详细的分析电子-声子相互作用为基础的超导理论的制度，米格达尔的定理不再有效。 这项工作还利用了新的理论工具，已开发的许多机构的问题，在大尺寸（或替代大的原子配位数）。 本文提出的工作包括第一性原理计算谱密度（SD），使用更精确的算法从实验隧穿数据推导SD，在超导理论中加入顶点修正，分析晶格非谐性的影响。 该补助金用于支持乔治敦大学两名年轻教师（一名女性）在超导理论方面具有互补兴趣和专业知识的合作研究。传统超导体与最近发现的所有超导体（掺杂富勒烯、高Tc材料）之间的一个主要区别是，在阐明传统材料中的超导性方面如此成功的理论框架不能应用于新材料。 这个项目是考虑相关的困难，并找到解决办法。 ***

9627778 Freericks/Liu This grant supports a new program, consisting of two young faculty members, one female (A. Liu) in condensed matter physics at the Georgetown University. The grant supports work on a careful and detailed analysis of the electron- phonon interaction based theory of superconductivity in the regimes where Migdal's theorem is no longer valid. This work also takes advantage of new theoretical tools that have been developed for many body problems in large dimensions (or alternatively large coordination number for atoms). The work proposed here includes first principles calculation of the spectral densities (SD), derivation of SD from the experimental tunneling data using more accurate algorithm, incorporate vertex corrections in the theory of superconductivity and analyze the effects of lattice anharmonicity. %%% This grant is to support collaborative research of two young faculty (one female) with complementary interests and expertise in the theory of superconductivity at Georgetown University. A major difference between the conventional superconductors and essentially all of the ones that have been discovered recently (doped fullerenes, high Tc materials) is that the theoretical framework, so successful in elucidating superconductivity in conventional materials, cannot be applied to the new materials. This project is to consider the associated difficulties and find solutions for them. ***