题　目：Possible Exotic Superconductivity in the Single Layer and Bilayer Silicene
报告人：杨帆 教授 (北京理工大学物理系)
时　间：10月16日（周三），下午3:30 - 4:30
地　点：南校区第一实验楼406会议室

报告摘要：
Silicene, the silicon-based counterpart of graphene, has attracted a lot of research interest since synthesized recently. Similar honeycomb lattice structures of the two systems let them share most of their marvelous physical properties. The most important structural difference between the two systems lie in the noncoplanar lowbuckled geometry in silicene, which brings up a lot of interesting physical consequence to the system. Here we focus on possible exotic superconductivity (SC) in the family, via random phase approximation (RPA) study on the relevant Hubbard-models. Two systems of this family are studied, including the single layer and bilayer silicene. For the former system, we found an electric-field driven quantum phase transition (QPT) from chiral d+id to f-wave SC when the field is perpendicular to the silicene plane. For the latter system, we found that even the undoped system is intrinsically metallic and superconducting with chiral d+id symmetry and tunable Tc which can be high . Our study not only provides a new playground for the study of the exotic SC, but also brings a new epoch to the familiar Si industry.
Journal Ref:  Feng Liu, et al, Phys. Rev. Lett. 111, 066804 (2013).
Li-Da Zhang, et al, arXiv:cond-matt/1309.7347

报告人简介：
杨帆，1996年武汉大学本科毕业，2002年博士毕业于北京大学物理系，之后于清华大学高等研究中心从事博士后研究。2004年进入北京理工大学物理系。2009年底至2011年初访问美国加州大学伯克利分校。现任北理物理系教授、教育部“新世纪优秀人才”，从事凝聚态物理方面的理论研究。在Phys. Rev. Lett等高水平国际期刊上发表学术论文多篇。主要研究兴趣集中在强关联电子系统、量子磁性和超导理论等方面。