| 报告题目 | Spin-orbit coupling in graphene-based systems |
| 报告人 | Prof. Ruqian Wu |
| 报告人单位 | University of California, Irvine |
| 报告时间 | 2013-07-25 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
Two-dimensional topological insulators (2D TIs) have been proposed as platforms for many intriguing applications, ranging from spintronics to topological quantum information processing. Realizing this potential will likely be facilitated by the discovery of new, easily manufactured materials in this class. With this goal in mind, we introduce a new framework for engineering a 2D TI by hybridizing graphene with impurity bands arising from heavy adatoms possessing large spin-orbit coupling (SOC), in particular, osmium and iridium. First-principles calculations predict that the gaps generated by this means exceed 0.2 eV over a broad range of adatom coverage; moreover, tuning of the Fermi level is not required to enter the TI state.
Furthermore, we also demonstrated the feasibility of achieving giant magnetic anisotropy energy (MAE), another important SOC induced phenomenon, in systems with transition metal dimers on defected and decorated graphene. In particular, either a Pt-Ir dimer on a single vacancy or an Os-Ru dimer on a nitrogen-decorated divacancy possesses an MAE larger than 60 meV and high structural stability. Interestingly, their magnetic anisotropy can be conveniently manipulated by using external electric field. These features make them good candidates for the use in room temperature spintronics and quantum computing devices.
报告人简介：
武汝前，1978年 2 月－1981年 1 月, 盐城师范学院物理系；1984年 8 月－ 1989年 7 月, 中国科学院物理研究所，理学博士; 1989年 8 月－1994年 6 月, 美国西北大学物理系，Research Associate; 1994年 7 月－2001年 6 月, 美国加州州立大学Northridge校区物理系，Assistant Professor-Professor; 2001年 7 月至今，美国加州大学Irvine校区物理系, Professor. 2013年 7 月起兼复旦大学教授。2001年获选为美国物理学会会士。2002年起被聘为 Phys. Lett. A 在凝聚态物理方向的编辑。专长在于原创性发展和应用能带方法及计算程序，研究复杂材料的物理和化学性能。在国际上率先研究磁性薄膜及纳米磁性材料；发展了磁晶各向异性，磁光效应，磁致伸缩，磁X光二向色性计算方法，并开创性地用第一原理方法定量研究杂质和晶界对材料力学性质的影响。 |
