项目名称: 过渡金属化合物中自旋轨道耦合的新奇效应
项目编号: No.11474059
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 数理科学和化学
项目作者: 吴骅
作者单位: 复旦大学
项目金额: 82万元
中文摘要: 自旋轨道耦合(Spin-Orbit Coupling, SOC)因其丰富的物理效应,最近而备受关注。本项目将利用第一性原理的电子结构计算,研究过渡金属化合物中SOC的新奇效应。我们将研究各种维度的5d过渡金属化合物(以及5d-4d-3d混合的系统)中的晶体场,以及SOC形成的自旋-轨道纠缠态。我们将揭示SOC是如何影响甚至决定着各样的磁结构、磁晶各项异性、金属绝缘体转变、和拓扑绝缘态。我们还将开展计算材料设计,研究利用界面、超晶格、压力、以及5d-4d-3d过渡金属的混合,来调控晶体场和自旋-轨道纠缠态,进而调控SOC所带来的新奇物性。我们还将发展瓦尼尔函数基组下的DFT+U计算模块,改进对5d和4d巡游电子中等或弱关联效应的描述。
中文关键词: 自旋轨道耦合;过渡金属化合物;电子结构;磁性;第一性原理计算
英文摘要: Spin-orbit coupling (SOC) is of current great interest due to its abundant effects. In this project, we will study the novel effects of the SOC in transition-metal compounds, using first-principles electronic structure calculations. We will probe the crystal field of 5d transition-metal compounds (and the mixed 5d-4d-3d systems) in different dimensionality, and the entangled spin-orbital state due to the SOC. We will clarify how the SOC affects and even determines various magnetic structures, magnetocrystalline anisotropy, metal-insulator transition, and topological insulating state. We will make computational materials design, using interface, superlattice, pressure, and 5d-4d-3d transition-metal mixing to control the crystal field and the entangled spin-orbital state, and hence to tailor the novel effects of the SOC. We will also develop a computing module for the DFT+U method in the Wannier functions basis, which will improve a description of the modest or weak correlation effects of itinerant electrons in 5d or 4d transition-metal compounds.
英文关键词: Spin-Orbit Coupling;Transition-Metal Compounds;Electronic Structure;Magnetism;First-Principles Calculations