报告题目: 2D materials and their fascinating physical properties

报 告 人：屈凡尧 教授

报告时间：2019年1月3日（周四）15:30

报告地点：物理楼313报告厅

报告人介绍：屈凡尧教授，现任巴西利亚大学物理学院、凝聚态物理国际中心教授，巴西利亚大学应用物理中心主任，巴西科学院凝聚态物理专业委员会委员。曾先后在伟德国际victor1946物理系、加州大学伯克利分校物理系、加拿大科学院、巴西乌伯兰迪亚联邦大学、意大利国际理论物理研究中心和德克萨斯大学奥斯汀分校任职或访学。研究兴趣主要包括：磁性半导体，强关联系统，二维材料和范德瓦尔斯异质结的电子结构、光热、量子输运及拓扑性质，范德瓦尔斯异质结的自旋和多激子的谷动力学，量子信息和纳米器件模拟，等。先后在Phys. Rev. Lett., Phys. Rev. B和Appl. Phys. Lett等主流物理期刊发表论文近百篇，参与《Quantum-dot Based Light-emitting Diodes》等4部专著的编纂，在国际大会做邀请报告19次，组织国际会议2次。

报告内容：Exploiting the “valley” degree of freedom to store and manipulate information is an emerging direction of condensed matter physics, and provides a novel paradigm for future electronics. Transition metal dichalcogenides (TMDs) have valley degree of freedom, which features optical selection rule and spin-valley locking, making them promising for valleytronics devices and quantum computation. In this talk, I will briefly introduce the development of 2D materials over the past few years, including the advances in the synthesis and engineering of various 2D materials. I will also report the unique physical properties of the 2D materials, focusing on the TMDs, such as quantum spin Hall effect, valley Hall effects and spin-valley coupled physics. After that, I will discuss our recent results about novel potential Qubits for valleytronics: dark exciton and biexciton consisting of one bright and one dark excitons in the TMDs. Finally, I am going to show the potential applications of 2D materials in novel electronic devices, bio-sensors, energy storages, etc..

References:

1. R. Vasconcelos, H. Bragança, F. Y. Qu, and J. Y. Fu, Phys. Rev. B 98, 195302 (2018).

2. A. C. Dias, F. Y. Qu, D. L. Azevedo, and J. Y. Fu, Phys. Rev. B 98, 075202 (2018).

3. D. Oliveira, L. Villegas-Lelovsky, and F. Y. Qu, Phys. Rev. B 97, 125309 (2018).

4. J. Y. Fu, A. Bezerra, and F. Y. Qu, Phys. Rev. B 97, 115425 (2018).

5. V. O. Gordo et al., Nanoscale 10, 4807 (2018).

6. M. H. Zhang, J. Y. Fu, A. C. Dias and F. Y. Qu, J. Phys.: Condens.