磁场作用下三维拓扑半金属的热电输运性质研究

The research on the topology of materials is continuing at the forefront of the condensed matter physics. The study of the quantum transport now has become a hotspot, the purpose of which is to design the next generation of the electron devices based on the materials’ topology. With the deepening of the research, persons now focus on the thermoelectric transport properties in the presence of magnetic fields experimentally, while the corresponding theoretical investigations are just starting. The analysis of the experimental data still remains on the stage of applying the electric transport results to the thermal one. In this project, by using the Kubo formula and the Boltzmann equation with Berry curvature correction, we will study the thermoelectric transport properties of three-dimensional topological semimetals in the presence of magnetic fields. The relation between the quantum oscillation of thermal quantities of the bulk topological semimetals and the material parameters will be analyzed. The quantum oscillation of thermal quantities induced by the Fermi arcs in three-dimensional topological semimetals will be discussed. The study on the novel thermoelectric properties in the quantum limit of these systems will be carried out. The effects of carrier-impurity scattering, the direction of magnetic fields and the topology of the energy band will be discussed. By including the corrections of the higher order terms of electric fields and temperature gradient fields, the thermoelectric effects related to the chiral anomaly for different systems will be explored. It is expected that these studies will help us to enhance the deep understanding of the quantum transport properties of these topological semimetals in the presence of magnetic fields, to explain the experimental results, and to design a new kind of devices basing on these topological materials.

凝聚态物质拓扑性的研究持续活跃于凝聚态物理的最前沿。以开发基于材料拓扑性的新一代电子器件为最终目的的量子输运研究，已经成为该领域的一个热点。随着研究的深入，实验上人们开始广泛地关注磁场作用下三维拓扑材料的热电输运性质，然而相关的理论研究才刚刚起步，对实验数据的分析有些还处于套用电输运结果的阶段。本项目拟利用Kubo公式和Berry曲率修正的Boltzmann方程研究磁场作用下三维拓扑半金属的热电输运性质：分析三维块体拓扑半金属的热电量子振荡特性与材料参数的关系；探讨三维拓扑半金属中费米弧导致的热电量子振荡；考察各种三维拓扑半金属在量子极限下的新颖热电输运性质，讨论载流子杂质散射、磁场方向和能带拓扑性的影响；研究手性反常对热电效应的影响，讨论外电场、温度梯度场的高阶修正作用。本项目有助于人们对磁场作用下拓扑半金属量子输运性质的深入理解，并且将为实验观测和开发基于拓扑材料的器件提供理论依据。

内容获取失败，请点击重试