主讲人：许亚芳 副教授（扬州大学）

题目：Topological Phases and Anomalous Nernst effect in Two-dimensional Hexagonal Lattice Materials

时间：2024年1月5日（周五）下午15：00

地点：理工楼1215

腾讯ID：956 746 643

联系人：赵继泽

报告摘要：

Since the first fabrication of monolayer graphene, there have been numerous investigations focused on finding special transport and topological properties in Dirac electrons. For the familiar topological states such as QSH，QVH phases, the most common methods to characterize them are to either find the edge states in nanoribbons or calculate the Chern numbers. However, for the metal state, there are no topological edge states and the Chern number is usually ill defined. Whether a metal state has topological properties is usually ignored. Here, we demonstrate the special topological metal phases and peculiar spin- and valley-dependent anomalous thermoelectric transport properties in monolayer graphene, which is modulated by applying different external fields. It is proposed to probe the topological properties of the metal states with the anomalous Nernst effect. By utilizing these topological phases, an electrically or magnetically controlled switch can be designed by a two-terminal topological spin half metal junction.

个人简介：

许亚芳，扬州大学副教授，研究生导师，主讲物理专业“电动力学”课程。2011-2016年硕博连读毕业于南京大学物理学院，随后进入扬州大学工作。主要研究领域为低维纳米材料的拓扑相变和电热输运性质，以及自旋、能谷量子器件设计。主持国家自然科学基金两项，江苏省自然科学青年基金一项，截止目前在包括Phys. Rev. B, Phys. Rev. Appl, NJP等重要国际学术期刊发表论文20余篇。