【预告】中国科大施汝为系列讲座 | 南方科技大学卢海舟教授：Theory for the CDW mechanism ...

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此次讲座由中科院强耦合量子材料物理重点实验室、中国科大物理系、科研部联合主办，由低温物理学报承办，于2020年10月8日15:00开始。授权蔻享学术进行网络直播。

主题：Theory for the CDW mechanism of 3D quantum Hall effect

主讲人：卢海舟 教授

单位：南方科技大学

时间：2020年10月8日 15:00
主办方：中科院强耦合量子材料物理重点实验室、中国科大物理系、科研部
承办方：低温物理学报

报告摘要

The charge-density-wave (CDW) mechanism of the 3D quantum Hall effect has been observed recently in ZrTe5 [Tang et al., Nature 569, 537 (2019)]. Different from previous cases, the CDW forms on a 1D band of Landau levels, which strongly depends on the magnetic field. However, its theory is still lacking. We develop a theory for the CDW mechanism of 3D quantum Hall effect. The theory can capture the main features in the experiments. We find a magnetic field induced second-order phase transition to the CDW phase. We find that electron-phonon interactions, rather than electron-electron interactions, dominate the order parameter. We extract the electron-phonon coupling constant from the non-Ohmic I-V relation. We point out a commensurate-incommensurate CDW crossover in the experiment. More importantly, our theory explores a rare case, in which a magnetic field can induce an order-parameter phase transition in one direction but a topological phase transition in other two directions, both depend on one magnetic field.

主讲人介绍

卢海舟 教授

Hai-Zhou Lu obtained his Ph.D. in Physics from Institute for Advanced Study, Tsinghua University, Beijing, in 2007. From 2007 to 2015, he was a Postdoc and then Research Assistant Professor at the University of Hong Kong. In 2015, he joined Southern University of Science and Technology, Shenzhen, China, and now is a Professor of Physics. His research is focused on the quantum transport in topological matter. 

编辑：冯春丽

海报：冯春丽

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